@article{ author = {Nori, H and Hajifattahi, F and Moezzighadim, N and Alirezaei, S}, title = {Evaluation of Patients’ Awareness of Their Blood Pressure and Blood Glucose at the Dental Faculty of Islamic Azad University of Medical Sciences, Tehran, Iran, in 2018}, abstract ={Background and Aim: Most dentists rely on the patient's history when assessing a patient's medical status although many patients are unaware of their medical condition. We aimed to evaluate patients' knowledge of their blood pressure (BP) and blood glucose (BG) at the Dental Faculty of Islamic Azad University of Medical Sciences, Tehran, Iran, in 2018. Materials and Methods: In this cross-sectional study, 200 patients aged 18 years and over were enrolled with consent. Patients' body mass index (BMI) was classified according to the World Health Organization (WHO) criteria. Patients' BP was measured from the right arm and was considered abnormal when BP≥140/90 mmHg based on the JNC7 criteria. BG levels were measured from the capillary blood of the third finger of patients’ hands and were classified according to the American Diabetes Association (ADA) criteria. Data were analyzed using the chi-square test. Results: Eighty-nine male patients (44%) and 111 female patients (56%) with the mean age of 44±14.1 years were studied. Thirty percent of the subjects had high BP, and 21% had diabetes. Thirteen percent and 9.5% of the subjects were not aware of their high BP and BG, respectively. Lack of awareness of hypertension was significantly associated with being male and with a BMI higher than normal. Lack of awareness of high BG was associated with being male, older age, a BMI higher than normal, and lower education level (P<0.05). Conclusion: It seems that knowledge of BP and BG in dental patients is inadequate and requires more precision and sensitivity in assessing these cases before any dental intervention. }, Keywords = {Body Mass Index, Hypertension, Diabetes Mellitus, Blood Pressure, Blood Glucose, Awareness}, volume = {5}, Number = {1}, pages = {1-7}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.1}, url = {http://jrdms.dentaliau.ac.ir/article-1-262-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-262-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {zamanzadeh, M and Rayyani, A and Mirzaie, M and Mahmodnia, E}, title = {Assessing the Levels of Knowledge About Common Causes and Treatments of Traumatic Dental Injuries Among General Dentists in the City of Bandar Abbas in 2018}, abstract ={Background and Aim: Traumatic dental injuries (TDIs) are among the urgent challenges in dental sciences. These types of trauma are a common dental health problem, which may affect hard tissues and tooth-supporting structures. Since dentists’ knowledge and practice are vital for TDI treatments, this study aimed to assess the levels of knowledge of TDIs among general dentists working in Bandar Abbas, Iran. Materials and Methods: This cross-sectional study was conducted on 97 general dentists working in the city of Bandar Abbas, Iran, using a three-part questionnaire comprising items about demographic characteristics, knowledge of TDI causes, and knowledge of TDI treatments. Descriptive and analytical statistical analyses of data were performed according to Mann-Whitney and Kruskal-Wallis tests using SPSS 20 software at the significance level of 0.05. Results: Ninety-seven general dentists, including 61 men and 36 women, participated in this study. The findings revealed that 60.9% and 46.4% of these dentists had high levels of knowledge about TDI causes and treatments, respectively. The mean score obtained by the general dentists was 11.86±2.87, which was promising. A significant relationship was observed between university affiliation and levels of knowledge (P=0.002). Conclusion: According to the results, knowledge about common causes and treatments of TDI was at a favorable level among the general dentists working in Bandar Abbas. There was a significant relationship between university affiliation and levels of knowledge; dentists who graduated from universities located in the city of Tehran, Iran, had higher levels of knowledge than others did.}, Keywords = {Knowledge, Trauma, Children, Dentoalveolar}, volume = {5}, Number = {1}, pages = {8-12}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.8}, url = {http://jrdms.dentaliau.ac.ir/article-1-266-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-266-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Mehralizadeh, S and Talaipour, AR and Olyaee, P and Amirisiavoshani, M}, title = {Correlation Between Tissue Densities in Computed Tomography and Three Different Cone-Beam Computed Tomography Units (In Vitro)}, abstract ={Background and Aim: Bone density is of great assistance in the selection of the proper implant site. The present study aimed to assess the correlation between tissue densities in computed tomography (CT) and three different cone-beam computed tomography (CBCT) units. Materials and Methods: In this descriptive study, a radiographic phantom consisting of a transparent polymethyl methacrylate (PMMA) cylinder with a 50-mm height and a 50-mm diameter was used, which comprised eight materials, including air, fat, water, PMMA, muscle, cortical bone, cancellous bone, and aluminum. Each material was of 5 mm height and 5 mm in diameter. A 20-mm-thick hollow plexiglass cylinder was used to simulate the soft tissue. The phantom was scanned four times using 16-Slice Lightspeed CT, NewTom VGi, CRANEX 3D, and Rotograph Evo 3D CBCT units. The data were primarily reconstructed and transferred to the OnDemand 3D software in the Digital Imaging and Communications in Medicine (DICOM) format. All the assessments were made in the sagittal plane, and the average density of each of the mentioned eight materials was calculated with the proper grayscale value calculation of each system, which utilizes a simulation inherent density calculation for any region of interest (ROI). Results: The results showed that tissue densities are different in CT and CBCT units. The values estimated by the CRANEX 3D unit approximated that of CT, followed by NewTom VGi and Rotograph Evo 3D CBCT units. Kruskal-Wallis test showed that the differences in the scores are statistically significant (P<0.01), Conclusion: Considering the results, CBCT cannot accurately calculate tissue density.}, Keywords = {Bone Density, Cone-Beam Computed Tomography, In Vitro Techniques, Multidetector Computed Tomography, Radiographic Image Interpretation, Computer-Assisted, Software}, volume = {5}, Number = {1}, pages = {13-20}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.13}, url = {http://jrdms.dentaliau.ac.ir/article-1-261-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-261-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Jalalian, E and Shariati, M and Salari, MH and Soltanzade, SH and Banifatemeh, AR and Hashemi, E and Mohammadi, M}, title = {In-Vitro Effect of G-Bond and Z-Prime Plus on Fracture Resistance of Prefabricated Zirconia Posts Bonded to Root Canal Walls}, abstract ={Background and Aim: This study aimed to assess the effect of G-Bond and Z-Prime Plus on fracture resistance of prefabricated zirconia posts bonded to root canal walls. Materials and Methods: This in-vitro experimental study evaluated 22 mandibular premolars with equal diameter and length. The teeth were cut at the cementoenamel junction (CEJ), underwent root canal treatment, and were randomly divided into two groups (n=11). One tooth from each group served as a control. Post space was prepared in the remaining teeth with a 10-mm length. Intracanal dentin was then etched, rinsed, and dried. Panavia F2 resin cement was applied to the canal. Z-Prime Plus and G-Bond were applied to the surfaces of zirconia posts in groups 1 and 2, respectively, and the posts were then cemented into the canals. The cores were built-up using Photo Core resin composite. The teeth underwent a compressive force applied to the central fossa of the core along their longitudinal axes at a crosshead speed of 0.5 mm/minute. The load at fracture was recorded. Data were analyzed using t-test considering their normal distribution. Results: The mean fracture resistance was 1094.2±328.0 N with G-Bond and 912.6±373.0 N with Z-Prime Plus; the difference was not significant (P=0.4). Conclusion: G-Bond and Z-Prime Plus were not significantly different in fracture resistance of zirconia posts bonded to root canal walls. However, G-Bond is recommended for this purpose since it had a lower coefficient of variation (CV) and slightly higher fracture resistance.  }, Keywords = {Endodontics, Fracture Strength, G-Bond, Post and Core Technique, Zirconia, Z-Prime Plus}, volume = {5}, Number = {1}, pages = {21-26}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.21}, url = {http://jrdms.dentaliau.ac.ir/article-1-257-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-257-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Fattahi, F and Haghighat, S and Babaei, N and Aminkhaki, Z and Khajavi, F and Torabi, K}, title = {Effect of Centric, Assisted Non-Working, and Unassisted Non-Working Interferences on Temporomandibular Disorders}, abstract ={Background and Aim: Temporomandibular disorder (TMD) is a multifactorial problem caused by many reasons. There is still controversy about the effect of different types of occlusal disorder on TMD. This study was designed to determine the effects of centric and assisted and unassisted non-working interferences on TMD. Materials and Methods: In this cross-sectional study, 100 dental students, including 64 males and 36 females with the age range of 18 to 24 years old, were examined. Subjects with a history of systemic or muscular diseases and orthodontic treatment were excluded. TMD signs and symptoms including maximum mandibular opening limitation, maximum lateral movement limitation, maximum protrusion limitation, deviation and deflection, joint pain and tenderness, joint sounds, and masticatory muscle tenderness were examined. Subjects were also examined for having centric interferences and eccentric interferences including assisted and unassisted non-working interferences. Data were analyzed using the chi-square test and independent-sample T-test. Results: Subjects with centric interference had a significantly higher number of clicks (P=0.02), medial pterygoid tenderness (P=0.009), and right medial pterygoid tenderness (P=0.007). We could also find a significantly higher number of clicking in subjects with assisted non-working interference (P=0.002). Conclusion: The findings of the present study suggest that different types of occlusal interference, specially centric and assisted non-working interferences, can lead to TMD signs and symptoms.}, Keywords = {Temporomandibular Joint Disorders, Traumatic Dental Occlusions, Chi-Square Distribution}, volume = {5}, Number = {1}, pages = {27-33}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.27}, url = {http://jrdms.dentaliau.ac.ir/article-1-264-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-264-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {shirzaiy, M and Sarabadani, J}, title = {Recurrent Aphthous Stomatitis and Related Factors Among 12-17-Year-Old Students in Zahedan, Iran}, abstract ={Background and Aim: Recurrent aphthous stomatitis (RAS) is one of the most common lesions in the oral mucosa. The etiopathogenesis of RAS is not clear. RAS is multifactorial, and several factors can contribute to RAS development. This study aimed to evaluate the RAS prevalence and some related factors in 12-17-year-old schoolchildren in Zahedan City (Southeast of Iran). Materials and Methods: In this descriptive-analytical study, 800 students (12-17 years old) of Zahedan City were examined for the assessment of RAS prevalence and related factors. After filling the questionnaire, oral examinations were done by an oral medicine specialist for RAS prevalence determination. Data were analyzed in SPSS 21 software according to the analysis of variance (ANOVA) and the chi-square test. Results: The RAS prevalence in 12-17-year-old students (400 boys and 400 girls) was 40.7%. The RAS prevalence in girls was significantly higher than that in boys (51% vs 20.5%; P=0.02). RAS had no significant correlation with age or the dominant hand (P˃0.05). Family history of RAS, stress, and trauma from toothbrushing correlated with RAS. The most common location of RAS was the lower lip (29.4%) followed by the mandibular vestibule (19.3%) and the right buccal mucosa (11.58%). Conclusion: RAS prevalence was high among 12-17-year-old students of Zahedan City. Girls were more susceptible to RAS. Age group and the dominant hand did not affect RAS development. It seems that predisposing factors, such as family history of RAS, stress, and trauma from toothbrushing, could contribute to RAS development. The most common location of RAS is the labial mucosa.}, Keywords = {Aphthous Stomatitis, Prevalence, Stress Disorders}, volume = {5}, Number = {1}, pages = {34-39}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.34}, url = {http://jrdms.dentaliau.ac.ir/article-1-265-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-265-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Baghban, M and Lesan, S and Farrokhnia, T and Kiani, A}, title = {Salivary Flow Rate and pH in Asthmatic and Non-Asthmatic Patients}, abstract ={Background and Aim: Saliva is an essential fluid for protecting the mouth, and any change in its quality or quantity affects the health of the oral cavity. Asthma and the medications used to treat it may decrease salivary flow and change salivary components, including changes in the pH of the dental plaque. The purpose of this study was to determine the salivary flow and pH in asthmatic and non-asthmatic patients referring to the Asthma Clinic of Masih Daneshvari Hospital in Tehran, Iran, in 2019. Materials and Methods: This cross-sectional study was performed on 70 patients aged 18-60 years (35 asthmatic patients and 35 healthy controls). After completing the datasheets, saliva was collected by the spitting method for 5 minutes. Its flow rate was recorded in ml/minute, and its pH was measured by a pH meter. The results were analyzed via SPSS 20 software according to the t-test and Mann-U-Whitney statistical test. Results: The mean salivary flow rate was 4.22 ml/minute in the asthmatic group and 5.44 ml/minute in the healthy group (P<0.005). The mean salivary pH in the asthmatic patients and the control group was 6.9 and 7.1 (P<0.005), respectively, indicating that salivary flow rate and pH were significantly lower compared to the healthy group. Statistical analyses also showed that the higher the frequency of drug use, the greater the decrease in the salivary flow (P<0.005). Conclusion: It seems that asthma and the drugs used for its treatment reduce salivary flow and pH. }, Keywords = {Asthma, Anti-Asthmatic Agents, Saliva, Case-Control Studies}, volume = {5}, Number = {1}, pages = {40-45}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.1.40}, url = {http://jrdms.dentaliau.ac.ir/article-1-268-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-268-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Bagherymoghadam, S and Mirzaei, F}, title = {Educational Problems of Dental Schools During Coronavirus Disease 2019 (COVID-19) Outbreak in Iran}, abstract ={On 20 January 2020, the World Health Organization (WHO) stated that the outbreak of Coronavirus disease 2019 (COVID-19) is a global concern that poses a high risk for countries like Iran with vulnerable health systems. In Iran, virtual education began a few weeks after the suspension of universities. However, this was difficult for the field of dentistry to achieve as practical courses cover most of the academic semester. In this article, we state the problems among dental schools of Iran during the outbreak of COVID-19.}, Keywords = {COVID-19, Dental Education, Humans}, volume = {5}, Number = {2}, pages = {1-1}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.1}, url = {http://jrdms.dentaliau.ac.ir/article-1-274-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-274-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {FatahiVanani, N and Golestaneh, A and MalekiGorji, M}, title = {Comparison of Pain, Wound Healing, Facial Edema, and Surgeon’s Comfort in Surgical Extraction of Impacted Third Molars: Surgical Scalpel Versus Radiofrequency Incision}, abstract ={Background and Aim: This study aimed to compare the level of pain, wound healing, facial edema, and surgeon’s comfort in surgical extraction of impacted third molars using surgical scalpel versus radiofrequency (RF) incision. Materials and Methods: This split-mouth clinical trial evaluated 41 patients with bilateral impacted third molars in one jaw with the same Pederson difficulty index (between 5 and 7, moderate difficulty). The surgical incision was made using a surgical scalpel on one random side and an RF device on the contralateral side. The level of pain was measured using a numerical rating scale (NRS) 7 days postoperatively. The wound healing was evaluated using the wound evaluation scale (WES) 4 weeks postoperatively. Facial edema was quantified using a tape measure 7 days postoperatively. Surgeon’s comfort was assessed by asking the surgeons regarding the level of easiness of the procedure. The pain score, wound healing score, facial edema, and surgeon’s comfort in surgical extraction of impacted third molars were compared between the two sides using SPSS 22 via paired t-test and McNemar’s test.   Results: The surgeon’s comfort was significantly higher in the use of a surgical scalpel (P<0.001). The difference in pain score (P=0.95), wound healing (P=0.32), and facial edema (P>0.05) was not significant between the two groups. Conclusion: The results of this study showed no significant difference in surgical extraction of impacted third molars using a surgical scalpel or an RF device regarding the level of pain, wound healing, or facial edema.}, Keywords = {Pain, Wound Healing, Edema, Impacted Tooth, Third Molar, Tooth Extraction, Radiofrequency Therapy}, volume = {5}, Number = {2}, pages = {2-6}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.2}, url = {http://jrdms.dentaliau.ac.ir/article-1-267-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-267-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Shahbazi, S and Moezzighadim, N and Mirzaei, AR and Azizi, A}, title = {Comparison of Soft Tissue Thermal Changes Induced by Three Types of Diode Lasers at 810, 940, and 980nm Wavelengths}, abstract ={Background and Aim: Diode laser is a great choice for soft tissue surgery. The diode laser is partially absorbed by hard dental tissues, making it safe for soft tissue surgery. This study aimed to compare the tissue thermal changes induced by three types of diode lasers at 810, 940, and 980nm wavelengths. Materials and Methods: In this in-vitro experimental study, using a diode laser device (continuous mode with a 400μm fiber tip) at each of the 810, 940, and 980nm wavelengths and powers of 1, 2, and 3W in contact mode, incisions with the length of 2cm were made on pieces of meat over a period of 10 seconds. The primary and secondary temperatures were measured using a thermocouple. Data were analyzed using two-way analysis of variance (ANOVA). Results: Tissue temperature changes induced by diode laser at 810nm/3W were significantly greater than that of 2W power. These changes were higher with 2W of power compared to 1W (P<0.05). Temperature changes induced by diode laser at 940nm/2 and 3W were significantly greater than that of 1W power (P<0.05). Temperature changes induced by diode laser at 980nm/3W were significantly greater than that of 2W power. Tissue temperature changes were higher with 2W of power compared to 1W (P<0.05). Conclusion: Diode laser (continuous mode with a 400µm fiber tip) at 3W of power and 980nm wavelength caused the highest rate of thermal changes. The 810nm diode laser with the power of 1W caused the slightest heat changes in the soft tissue.  }, Keywords = {Diode Laser, Temperature, Soft Tissue Injuries}, volume = {5}, Number = {2}, pages = {7-13}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.7}, url = {http://jrdms.dentaliau.ac.ir/article-1-269-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-269-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Asnaashari, M and Meyari, A and Hajrezai, R and Paymanpour, P and Behrooz, N}, title = {Low-Pressure Radiofrequency Cold Plasma for Disinfection of Gutta-Percha Cones}, abstract ={Background and Aim: Different methods have been proposed for rapid disinfection of gutta-percha (GP) cones. This study aimed to assess the efficacy of low-pressure radiofrequency cold plasma (LRFCP) in disinfection of GP cones compared to three chemical disinfectants. Materials and Methods: Seventy GP cones were allocated to seven groups of 10 each. All samples were initially sterilized with ethylene oxide (EO) and subsequently inoculated with Staphylococcus aureus (S. aureus), except for the negative control group (n=10). In the experimental groups (n=50), samples were subjected to one-minute chemical disinfection [5.25% sodium hypochlorite (NaOCl), 2% chlorhexidine (CHX), and 10% Deconex® 53 PLUS) or LRFCP (30-second or one-minute). The effectiveness of disinfection was evaluated by counting the colony-forming units (CFUs). Data were analyzed using Kruskal-Wallis test (P=0.05). Results: S. aureus was completely eradicated in all groups. LRFCP and 5.25% NaOCl were the most effective agents in disinfection of GP cones. In addition, 2% CHX was significantly weaker than the other agents (P<0.05). Deconex® 53 PLUS (10%) was more potent than 2% CHX; however, the difference between 10% Deconex® 53 PLUS and other experimental groups was not significant (P>0.05).   Conclusion: LRFCP can be assumed as a noninvasive and efficient method for disinfection of GP cones.}, Keywords = {Disinfection, Gutta-Percha, Cold Plasma, Staphylococcus aureus}, volume = {5}, Number = {2}, pages = {14-20}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.14}, url = {http://jrdms.dentaliau.ac.ir/article-1-270-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-270-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Fakhari, A and Heshmat, H and EmamiArjomand, M and Tabatabaei, SF}, title = {Influence of Light-Curing Units on Color Stability of Composite Resins After Aging}, abstract ={Background and Aim: One of the most important problems with composite restorations is the loss of consistency between the composite and tooth color. The present study aimed to compare the color stability of two types of nanohybrid composites cured with different light-curing devices after aging. Materials and Methods: In this study, the color stability of 40 disc-shaped specimens (10 mm in diameter and 2 mm in height) from two types of enamel and dentin nanohybrid composites (IPS Empress Direct, Ivoclar Vivadent) was investigated. A group of 10 samples of each composite was cured by light-emitting diode (LED) Bluephase device (Ivoclar, Vivadent) at 1200 mW/cm2 for 20 seconds, and another group of 10 specimens was cured by a quartz-tungsten-halogen (QTH) device (Coltolux 2.5, Colten, USA) at 600 mW/cm2 for 40 seconds. The initial color of the samples was determined by the Konica Minolta spectrophotometer (CS2000, USA), and then, the composite samples were subjected to an accelerated artificial aging (AAA) process in the QUV/SPRAY device. Then, the color of the samples was reassessed. Two-way analysis of variance (ANOVA) was used to compare the color changes in the study groups at a significance level of P=0.05. Results: The specimens cured by the LED device showed significantly lower color change compared to QTH (P=0.047). However, there was no significant difference in color stability between enamel and dentin composites cured by a fixed apparatus (P=0.474). Conclusion: The curing of nanohybrid composites with LED devices causes lower color change compared to QTH.}, Keywords = {Aging, Composite Resins, Dental Curing Light, Spectrophotometry}, volume = {5}, Number = {2}, pages = {21-25}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.21}, url = {http://jrdms.dentaliau.ac.ir/article-1-272-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-272-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Sarkarat, F and Vahdati, SA and Mahaseniaghdam, HR and Nematallahi, Z and Farahmand, M}, title = {Bone Repair via Osteon and Bio-Oss: A Comparative Histological and Histomorphometric Animal Study}, abstract ={Background and Aim: Autogenous bone grafts are considered the gold standard although they have several disadvantages, leading to a search for suitable alternative graft biomaterials. This study evaluates the histological and histomorphometric properties of regenerated bone in defects in rabbits following the application of two commercially available xenografts (Bio-Oss and Osteon). Materials and Methods: This animal study was carried out on 14 New Zealand rabbit calvaria. Four 6.5-mm critical-size defect (CSD) models of bone regeneration were formed in each surgical site. The first defect was filled with Bio-Oss, the second with large Osteon (L-Osteon), the third with small Osteon (S-Osteon), and the last one remained unfilled (the control group). The cases were sacrificed. Bone forming properties (amount of new bone formation, inflammation, and foreign body reaction) were observed at 4- and 8-week intervals through histological and histomorphometric examinations. The Friedman test, Kruskal-Wallis test, and Wilcoxon test for multiple comparisons were used for data analysis. The level of statistical significance was set at 0.05. Results: There was no statistically significant difference for regenerated bone among the four groups (P>0.05). The L-Osteon site showed more inflammation and foreign body reaction compared to the other groups.  Conclusion: The results of this study showed that Bio-Oss and Osteon appear to be highly biocompatible and osteoconductive and can thus successfully be used as bone substitutes in augmentation procedures.}, Keywords = {Biocompatible Materials, Bio-Oss, Bone Grafting, Bone Formation, Bone Substitutes, Histology, Osteon}, volume = {5}, Number = {2}, pages = {26-33}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.26}, url = {http://jrdms.dentaliau.ac.ir/article-1-271-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-271-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Asadi, M and Farhadi, S and Gharanizadeh, K and Tavasoli-Hojjati, S and Ghadimi, S}, title = {Radicular Cyst Associated with a Maxillary Deciduous First Molar: A Therapeutic Case Report}, abstract ={Background: Radicular cysts are the most frequent odontogenic cysts of the jaws. Radicular cysts arising from the primary teeth are very rare and comprise 0.5% to 3.3% of radicular cysts in both primary and permanent dentitions. Case Presentation: In this paper, we report the clinical, radiographical, and histological characteristics of a radicular cyst associated with a maxillary deciduous first molar. The treatment plan included extraction and enucleation of the cyst under local anesthesia after the elevation of a mucoperiosteal flap, which led to satisfactory and uneventful healing. Conclusion: Early diagnosis of radicular cysts associated with the primary dentition allows for a less aggressive treatment plan and prevents adverse effects on the permanent successor.}, Keywords = {Radicular Cyst, Primary Molar, Deciduous, Periapical Cyst}, volume = {5}, Number = {2}, pages = {34-38}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.2.34}, url = {http://jrdms.dentaliau.ac.ir/article-1-201-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-201-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Shirzaiy, M and Neshat, F}, title = {Effect of Areca Nut on Oral Health: A Review}, abstract ={Background and Aim: Oral health can be influenced by habitual areca nut chewing. The consumption of products containing areca nut, such as paan, gutkha, supari, etc., is common in Asian countries, such as India, Bangladesh, and Pakistan. In Iran, areca nut product consumption is common in the southeast of Iran, especially in Chabahar, Iranshahr, and Nikshahr cities, which are in proximity to the Pakistan border. These products are easily accessible in these areas and are widely used due to a lack of awareness about their disadvantages. Areca nut contains tannins and alkaloids, such as arecaidine, guvacine, arecoline, and guvacoline. Arecaidine can stimulate the synthesis of collagen by stimulation and proliferation of fibroblasts. This review article aims to evaluate the effects of areca nut on oral health. Materials and Methods: Research was performed in the PubMed, ScienceDirect, Web of Science, Google Scholar, and Scopus databases, and 35 articles were selected in total. Results: By reviewing the studies, it was found that areca nut products cause periodontal disease as well as oral lesions, which can become malignant with continuing use. Conclusion: Areca nut product chewing has deleterious effects on oral and dental health. Tooth fracture, periodontal disease, leukoplakia, lichenoid lesions, oral submucous fibrosis (OSF), and oral cancer can be correlated with areca nut use. Therefore, public health proceeding to discontinue areca nut consumption is advised to control premalignant and malignant lesions, such as OSF and oral cancer.}, Keywords = {Areca, Habits, Oral Health}, volume = {5}, Number = {3}, pages = {1-6}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.1}, url = {http://jrdms.dentaliau.ac.ir/article-1-276-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-276-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Sezavar, M and ShafaeiFard, Sh and Sharifzadeh, H and Pahlevan, R and Badkoobeh, A}, title = {Evaluation of the Effect of Platelet-Rich Plasma on Temporomandibular Joint Disorders: A Split-Match Randomized Clinical Trial}, abstract ={Background and Aim: The reduction of temporomandibular joint disorders (TMD) is one of the most significant concerns in dentistry. In contrast to initial treatments, such as pharmacotherapy and physiotherapy, which act as temporary tranquilizers, growth factors have shown promising results in the stimulation of cell division. Given the limited research on the positive impact of platelet-rich plasma (PRP) on the permanent treatment of joint disorders in the knee and the temporomandibular joint (TMJ), we sought to investigate the effect of PRP on TMD. Materials and Methods: Twenty patients (40 sides) presenting with TMD from 2011-2016 were included in this split-mouth clinical trial. TMD was documented by evaluating pain, limitation in movement, joint sounds, and deviation of the mandible during mouth opening. Next, 0.6 ml of PRP prepared from subjects’ blood was injected into the joints. Patients were followed-up 2, 4, and 6 months postoperatively. The severity of pain was evaluated using Mann-U-Whitney test. The other criteria were analyzed using chi-square test at the follow-up sessions and McNemar's test within each group. Results: The analysis of the results showed no difference between the two groups at the two-month follow-up. The pain intensity reduced significantly at 4- and 6-month follow-ups (P<0.05). Limitation in movement and joint sounds decreased from the second- to the sixth-month follow-up (P<0.05 and <0.02). The treatment seemed to have no impact on mandibular deviation (P<0.9). Conclusion: Treatment with PRP seems to be a favorable adjunct in several criteria of TMD.}, Keywords = {Pain, Platelet-Rich Plasma, Temporomandibular Joint, Temporomandibular Disorders}, volume = {5}, Number = {3}, pages = {7-14}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.7}, url = {http://jrdms.dentaliau.ac.ir/article-1-280-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-280-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Nasermostofy, SH and Zarbakhsh, A and Alaei, MM and Bitaraf, T}, title = {Evaluation of the Effect of Zirconia and Titanium Abutments on Microleakage of Implant-Abutment Interface Under Oblique Cyclic Loading In Vitro}, abstract ={Background and Aim: Oral bacteria can proliferate in the implant-abutment interface (IAI) and cause inflammation in the peri-implant tissues and adjacent bone. This study aimed to assess the effect of zirconia and titanium abutments on the microleakage of the IAI under oblique cyclic loading conditions. Materials and Methods: In this in-vitro study, 12 implant-abutment assemblies with zirconia and titanium abutments, in two groups of six, were vertically mounted inside resin blocks modified with autopolymerizing polyester base. The specimens were subjected to 75N oblique cyclic loading at an angle of 30±2° to the longitudinal axis of the implant at a frequency of 1 Hz at 500,000 cycles, which is equivalent to 20 months of human masticatory force. Fuchsine solution was used to evaluate the microleakage. To examine the penetration of fuchsine into the IAI, the fixtures were cut from the middle using a cutting machine. Then, the amount of fuchsine penetration in each of the samples was measured with a stereomicroscope at ×75 magnification at three points in each semicircle (cut implant), and the average of these six points was recorded as microleakage (µm). T-test was used to compare the microleakage after load with the significance level set at 0.05. Results: The microleakage ​​rate after cyclic loading was 66.08±11.66 µm in zirconia abutments and 39.17±10.65 µm in titanium abutments, which was significantly higher with zirconia abutments (P=0.002). Conclusion: Microleakage after oblique cyclic loading varies depending on the type of abutment. Titanium abutments showed significantly less microleakage than zirconia abutments.}, Keywords = {Dental Implants, Dental Leakage, Abutment, Zirconia, Titanium}, volume = {5}, Number = {3}, pages = {15-20}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.15}, url = {http://jrdms.dentaliau.ac.ir/article-1-279-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-279-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Falahati, M and Golmohammadi, F and Darabi, R and jafari, M}, title = {Evaluation of Temporomandibular Joint Disorders and Related Factors in Patients Referring to Dental School of Isfahan Islamic Azad University in 2019}, abstract ={Background and Aim: Temporomandibular disorders (TMD) encompass several entities with different etiologies. Considering the high prevalence of TMD and the effect of this complication on the development of orofacial complications, this study aimed to determine the prevalence of TMD and its associated factors in patients referring to the Department of Prosthodontics of the Dental School of Isfahan Islamic Azad University, Isfahan, Iran. Materials and Methods: A cross-sectional study was conducted on 202 patients for TMD evaluation. Standardized checklists and paraclinical measures were used. SPSS was used with chi-square test, t-test, and one-way analysis of variance (ANOVA) to perform the statistical analysis with the level of significance set at P<0.05. Results: The prevalence of TMD in 202 patients was 43.6%. The average age of TMD patients was significantly higher than that of people without TMD (P=0.012). There was a significant difference between the two groups (with and without TMD) in the history of maxillofacial trauma (P=0.014) and restricted mouth opening (P=0.02). The Dawson classification, maxillofacial surgery, orthodontic treatment (P=0.42), and parafunctional habits (P=0.46) were not significantly different between the two groups. Conclusion: Since the frequency of TMD is remarkably high, dentists should look for signs of TMD on a routine schedule to minimize the long-term effects of this disorder. There was no significant relationship between TMD and the related factors, except for the trauma. It is recommended to study the etiology of this disease considering its recognized complications.}, Keywords = {Temporomandibular Disorders, Dental Occlusion, Occlusal, Risk factors}, volume = {5}, Number = {3}, pages = {21-25}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.21}, url = {http://jrdms.dentaliau.ac.ir/article-1-281-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-281-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Sayar, F and Hatami, B and Akhondi, N and Amini, E and Pourkarimkhani, Sh}, title = {Efficacy of peer mentoring versus dentist-led instruction for knowledge enhancement about oral health: A Clinical Trial}, abstract ={Background & Aim: Oral hygiene instructions are routinely provided at schools by health mentors and dentists. Recently, oral hygiene instruction by peers has gained popularity. This study aimed to compare the effect of oral hygiene instruction by dentists and peers on the level of knowledge of twelve-year old children. Methods and Materials: In this interventional randomized clinical trial, four schools were randomly selected. The level of oral health knowledge of students was assessed by a pretest. Oral hygiene instructions were then provided by dentists in control schools and by peer mentors in test schools. Knowledge of students about oral health was evaluated in the two groups immediately and after 1 month post instruction. The mean test scores were analyzed using SPSS version 20 and compared between the groups using two-way and repeated measures ANOVA.   Results: Oral hygiene instruction enhanced the overall knowledge of students about oral health immediately and at one month after the instruction compared with baseline in both groups (P<0.05). The overall knowledge score of students in the test group was higher than that of the control group immediately and at 1 month after the instruction (P<0.05). Conclusions: It appears that oral hygiene instruction by peer mentors can effectively increase knowledge acquisition with regard to oral health-related topics. Thus, peer mentoring in health-related topics is recommended as a practical and cost-effective approach. Considering the different pattern of learning in boys, repetition and reinforcement of instruction can promote their knowledge level in long-term.}, Keywords = {Health Promotion, Knowledge, Oral Health Education, Peer Group, Students.}, volume = {5}, Number = {3}, pages = {26-32}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.26}, url = {http://jrdms.dentaliau.ac.ir/article-1-277-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-277-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Ara, SA and Fatima, A}, title = {Acquired Immunity in Dentistry Students After Hepatitis B Vaccination}, abstract ={Background and Aim: After triple-course vaccination against Hepatitis B (HB), there may be a failure to increase antibody titer value or to maintain it at satisfactory seroprotective levels. This study aimed to evaluate the rate of seroprotection in dental students after receiving complete doses of HB vaccination. Materials and Methods: In this cross-sectional observational study, Anti-HBs levels of 100 dental students, who had received triple-course HB vaccines, were examined. Titres of more than 100 mIU/ml were considered as protective. The association between various parameters, like gender, age, duration of the last vaccination, booster dose, and comparison of anti-HBs levels at various durations from the last vaccination, was assessed. Results: Of the 100 participants, 52 were females and 48 were males. The participants’ age ranged from 22 to 31 years with the mean age being 28.12±2.552 years in females and 26.88±3.512 years in males. Overall, 65% of the participants had a good immune response i.e. anti-HBs values were more than 100 mIU/ml, 24% had a moderate immune response i.e. anti-HBs values were 11-99 mIU/ml, and 11% had a poor immune response i.e. anti-HBs values were less than 10 mIU/ml. Conclusion: There was a substantial failure rate in attaining or preserving satisfactory anti-HBs values after routine vaccinations against the HB virus (HBV). Hence, it is very important to determine post-vaccine serological anti-HBs values to take proper booster doses and maintain adequate immunity levels.}, Keywords = {Hepatitis B Vaccines, Dental Students, Acquired Immunity, Immunization Programs.}, volume = {5}, Number = {3}, pages = {33-36}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.33}, url = {http://jrdms.dentaliau.ac.ir/article-1-273-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-273-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Peimani, A and Abedi, P and Hajjafari, H}, title = {Effects of Low-Level Laser Therapy on Tooth Socket Repair in Diabetic Male Rats: An Animal Study}, abstract ={Background and Aim: Extraction of teeth in diabetic patients can be followed by some complications such as delay in recovery of hard and soft tissues, dry socket, and increased risk of infection. This study investigated the impact of low-level laser therapy (LLLT) on tooth socket healing following extraction of maxillary molars in male rats. Materials and Methods: In this experimental study, 30 male rats were divided into control and case groups. All rats were made diabetic with streptozotocin (STZ). After one week, the second molar of all rats was extracted. Helium-Neon (He-Ne) laser from a distance of 5 mm immediately irradiated tooth sockets in the experimental group for 120 seconds, which was continued until the third day. All the rats were sacrificed on days 3, 7, and 14 after the extraction in both groups for pathological evaluation of the amount of granulation tissue, angiogenesis, and the newly formed bone trabeculae, fibroblasts, macrophages, neutrophils, and lymphocytes. The results were statistically analyzed using Kruskal-Wallis test and one-way analysis of variance (ANOVA). Results: LLLT could increase angiogenesis until day three (P=0.009), reduce the number of lymphocytes after day fourteen (P=0.001), increase the number of fibroblasts and neutrophils (P<0.05), reduce the extent of granulation tissue during the study (P<0.05), and elevate the extent of bone trabeculae after day fourteen (P=0.001). Conclusion: The results indicated that low-level He-Ne laser therapy could reduce inflammation and accelerate the wound healing process in diabetic rats.}, Keywords = {Diabetes Mellitus, Low-Level Laser Therapy, Rats, Tooth Socket}, volume = {5}, Number = {3}, pages = {37-42}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.3.37}, url = {http://jrdms.dentaliau.ac.ir/article-1-283-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-283-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Jalalian, E and Shiari, S and Jalalian, SH and Mirzakhani, M}, title = {A Comparative Evaluation of Shear Bond Strength of Creation Ceramic Veneer to Metal and Zirconia Cores}, abstract ={Background and Aim: High chipping rates of the veneering porcelain of zirconia ceramic restorations have been reported in clinical studies. Thus, the shear bond strength (SBS) between the zirconia core and veneering porcelain requires investigation. Materials and Methods: In this in-vitro study, at first, using a computer-aided design/computer-aided manufacturing (CAD/CAM) machine, 16 zirconia cores of Kerox were provided. Using the casting method, 16 base metal cores were provided. All the cores were veneered with the Creation ceramic veneer. Afterwards, the samples were put under a static force in the universal testing machine at a crosshead speed of 1 mm/minute until fracture. T-test was used to analyze the data. Results: The mean SBS for the base metal and zirconia groups was 27±7.43 and 27.75±8.75 Megapascal (MPa), respectively (P=0.812). Conclusion: There was no significant difference between the metal-ceramic and zirconia ceramic groups in SBS so that the Creation ceramic veneer may solve the problems related to the bond of all-ceramics to ceramic veneers.}, Keywords = {Zirconia, Base Metal, Veneer Porcelain, Shear Bond Strength.}, volume = {5}, Number = {4}, pages = {1-6}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.1}, url = {http://jrdms.dentaliau.ac.ir/article-1-282-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-282-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Amiri, P and TourSavadkouhi, S and abbasi, M}, title = {Comparative Evaluation of Dentinal Microcrack Incidence After Root Canal Preparation by BioRaCe and Edge Taper Platinum}, abstract ={Background and Aim: Preparation of root canal with rotary nickel-titanium (NiTi) instruments may potentially create microcracks that can lead to vertical root fracture. This study aimed to compare the incidence of crack formation by BioRaCe and Edge Taper Platinum systems in the mesiobuccal canals of extracted first mandibular molars. Materials and Methods: In this experimental study, 50 first mandibular molars, which met all the inclusion criteria, with a canal curve of 25-35 degrees, were selected and randomly divided into two groups of 24. Each specimen was mounted in a resin block and a thin layer of silicone impression to simulate the periodontal ligament (PDL) while the apex was exposed. Group A was prepared by BioRaCe, and group B was prepared by Edge Taper Platinum. Two teeth were left unprepared and served as the control. The roots were sectioned horizontally at 3, 6, and 9mm from the apex and evaluated under a stereomicroscope at ×20 magnification. The presence of dentinal defects was examined and analyzed using Mann-Whitney test. Results: BioRaCe rotary files showed more cracks (47.3%) than Edge Taper Platinum (19.5%) at all three levels with a significant difference (P=0.038). No statistically significant difference was found between these two systems at the coronal (9mm from the apex) and apical (3mm from the apex) levels but a significant difference was found between BioRaCe and Edge Taper Platinum in the midroot (6mm from the apex; P=0.014). Conclusion: It seems that the Edge Taper Platinum system causes fewer cracks in curved dentinal walls compared to the BioRaCe system.}, Keywords = {Dentin, Endodontics, Tooth Fractures, Root Canal Preparation}, volume = {5}, Number = {4}, pages = {7-12}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.7}, url = {http://jrdms.dentaliau.ac.ir/article-1-284-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-284-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Sadatmansouri, S and Moradi, SH and Iranpour, B}, title = {Effect of Cyanoacrylate Adhesive on Tissue Healing After Periodontal Surgery}, abstract ={Background and Aim: Research on reducing the symptoms and discomfort after periodontal surgery is a priority. This study aimed to evaluate the effect of cyanoacrylate adhesive on tissue healing after periodontal surgery. Materials and Methods: In this split-mouth clinical trial, all patients who needed periodontal pocket removal surgery in two or more sextants were examined after receiving written informed consent. The mouth of each patient was randomly divided into control and case groups. Cyanoacrylate adhesive was used in the case group, and sutures were used in the control group to close the wound. Pain, plaque index of the surgical site, and tissue healing were evaluated in the first week of follow-up. The probing depth in the surgical site was assessed at the second follow-up (6 weeks after surgery). All the parameters were statistically analyzed by Mann-U-Whitney test. Results: In the first week of follow-up, the level of pain was 4.7±1.34 in the control group and 4.4±1.68 in the case group with no statistically significant difference (P=0.2). The healing rate was 3.3±0.53 in the control group and 2.7±0.64 in the case group with no statistically significant difference (P=0.3). The plaque index in the first week of follow-up was 3.9±0.82 in the control group and 3.8±0.97 in the case group (P=0.2). The probing depth in the sixth week of follow-up was 2.5±0.67 in the control group and 2.8±0.6 in the case group (P=0.2). Conclusion: Considering the results, it seems that cyanoacrylate adhesive can be a good alternative to sutures, especially when the patient cannot present for suture removal at the appointed time.  }, Keywords = {Cyanoacrylates, Wound Healings, Periodontal Index, Surgery, Sutures}, volume = {5}, Number = {4}, pages = {13-19}, publisher = {Islamic Azad University Dental Branch }, url = {http://jrdms.dentaliau.ac.ir/article-1-452-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-452-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {AnsariLari, H and Mobayeni, MR and Bolandian, P and Tavasoli, M and memaran, SH and Basirzadeh, H}, title = {Effect of 0.2% Chlorhexidine and Alcohol-Free Listerine on Microhardness of Major Plus Acrylic Denture Teeth}, abstract ={Background and Aim: The hardness and wear resistance of denture teeth have great importance in the longevity of dentures. This study assessed the effect of 0.2% chlorhexidine (CHX) and alcohol-free Listerine on the microhardness of acrylic denture teeth. Materials and Methods: In this in-vitro experimental study, 26 Major Plus teeth were randomly divided into three groups for immersion in 0.2% CHX, alcohol-free Listerine, and distilled water. Two teeth were not immersed in mouthwash to assess baseline microhardness. The teeth were mounted in wax blocks (20×20×6 mm), which underwent wax burnout and were replaced with heat-cure acrylic resin. The samples were immersed in the solutions for 120 minutes corresponding to 4 months of clinical service. They were removed from the solutions twice daily, each time for 30 seconds, rinsed with distilled water, and placed again in the solutions. Next, they were stored at room temperature for 24 hours. They were thermocycled and subjected to microhardness measurement at the incisal third of their labial surface using the Vickers test. Data were analyzed using t-test. Results: The baseline microhardness (n=2) was 27.9±0.98. The microhardness of samples immersed in CHX was 12 units (36.8%) lower than that of samples immersed in distilled water; this difference was statistically significant (P<0.002). The microhardness of samples in Listerine was 7.4 units (29.4%) lower than that of samples in distilled water with no statistically significant difference (P=0.1). Conclusion: Immersion of acrylic teeth in 0.2% CHX can significantly decrease their microhardness. The effect of non-alcoholic Listerine on microhardness is similar to that of distilled water.}, Keywords = {Non-alcoholic Listerine, Chlorhexidine, Hardness, Artificial Teeth, Acrylic Resins, Materials Testing}, volume = {5}, Number = {4}, pages = {20-25}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.20}, url = {http://jrdms.dentaliau.ac.ir/article-1-278-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-278-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Fatima, A and Mishra, s}, title = {Knowledge and Attitude of Dentists and Dental Students Towards Cone-Beam Computed Tomography}, abstract ={Background and Aim: The selection of an appropriate imaging or diagnostic technique is an important therapeutic step, which protects patients from the harmful effects of radiation. This study aimed to evaluate the knowledge and attitude of dentists and dental students towards cone-beam computed tomography (CBCT). Materials and Methods: This analytical-descriptive study evaluated a closed-ended questionnaire consisting of 16 questions, which was given to 100 participants, including faculty members, postgraduate students, and interns of our institution. Their response was analyzed by chi-square test. Results: In total, 100 questionnaires were analyzed. The mean age of the study population was 31.43±18 years (range: 23-45 years). Approximately 94% of the participants knew that the radiation dosage of CBCT is lower than that of CT. They obtained knowledge about CBCT through the committed dose equivalent (CDE), journals, seminars, internet, etc. Approximately 40% of the participants preferred CBCT scans for implant placement, 24% for trauma, 22% for cysts and tumors, and 14% for root canal treatment. About 54% of the participants considered CBCT as a part of the oral medicine and radiology domain and considered it necessary in oral and maxillofacial radiology departments only. Conclusion: This study showed that the participants had the knowledge and a positive attitude towards the regular use of CBCT for various clinical applications. This study also suggests that CBCT training of dental students helps all dentists to improve the precision and reliability of oral and maxillofacial-related diagnosis, treatment planning, and prognosis by effectual use of this technology.}, Keywords = {Cone-Beam Computed Tomography, Surveys and Questionnaires, Radiography, Dental, Digital/Methods}, volume = {5}, Number = {4}, pages = {26-30}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.26}, url = {http://jrdms.dentaliau.ac.ir/article-1-288-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-288-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Delvarani, A and Moshary, AA and GhasemianYadegari, M and Bitaraf, T}, title = {In-Vitro Comparison of the Effect of XP-Endo Shaper and One-Shape Rotary Files on the Incidence of Root Dentin Cracks}, abstract ={Background and Aim: Root canal preparation with systems with the least chance of dentin cracking can increase the success of endodontic treatment. This study aimed to compare the One-Shape and XP-endo Shaper rotary files in the dentin crack incidence in the mesiobuccal canals of mandibular first molars. Materials and Methods: In this experimental study, 60 eligible extracted mandibular first molars were randomly divided into three groups. The roots were prepared to #30 and 4% taper in the XP-endo Shaper group and #25 and 6% taper in the One-Shape group. The control samples were left intact. All groups were sectioned at 2, 4, and 6mm from the apex and examined under a stereomicroscope at 20× magnification. The incidence, location, and type of cracks were analyzed using chi-square test. Results: There were no cracks in the controls. The crack percentage was 23.33% (n=14) and 11.66% (n=7) in the One-Shape and XP-endo Shaper groups, respectively, with a significant difference with crack-fee samples. There was no significant difference between One-Shape and XP-endo Shaper systems in the three sections (P>0.05). In the 2mm section, cracks were observed in six sections (10%) with One-Shape and four sections (20%) with XP-endo Shaper. In the 4mm section, cracks were observed in one section (5%) with One-Shape and five sections (25%) with XP-endo Shaper. In the 6mm section, cracks were observed in seven sections (35%) with One-Shape and one section (5%) with XP-endo Shaper. Conclusion: The One-Shape and XP-endo Shaper systems were similar in crack incidence in the mesiobuccal canal of mandibular first molars.  }, Keywords = {Tooth Fractures, Root Canal Preparation, Mandible, Molar}, volume = {5}, Number = {4}, pages = {31-36}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.31}, url = {http://jrdms.dentaliau.ac.ir/article-1-292-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-292-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} } @article{ author = {Mardani, M and Hafezi, L and Ghadimi, N}, title = {Calcifying Odontogenic Cyst Associated with Impacted Mandibular Canine: A Case Report}, abstract ={Background: The calcifying odontogenic cyst (COC) is a rare cystic lesion, mainly affecting the anterior aspect of the jaws. It is usually discovered in unexpected settings and can be clinically observed as a painless and well-defined lesion. The COC may be associated with other odontogenic tumors, such as odontomas. Nearly 50% of COCs are associated with an unerupted tooth, most often a canine. The most unique features of this pathology are histopathological features, including a cystic lining with characteristic ghost epithelial cells with a tendency for calcification. Radiological examinations often reveal a radiolucent and unilocular lesion, sometimes associated with radiopaque lesions. Pathological assessments are required for the final diagnosis. Management is through complete excision with annual radiographic monitoring for five years. Case Presentation: Here, we report a classic case of COC in the left mandibular region associated with an extremely displaced impacted canine in a 16-year-old girl. Conclusion: Although uncommon, COCs are frequently associated with impacted teeth. The radiolucencies associated with impacted teeth have different effects on the surrounding structures and require different treatment plans, depending on the type of the lesion.}, Keywords = {Calcifying Odontogenic Cyst, Tooth, Impacted, Canine, Mandible}, volume = {5}, Number = {4}, pages = {37-41}, publisher = {Islamic Azad University Dental Branch }, doi = {10.29252/jrdms.5.4.37}, url = {http://jrdms.dentaliau.ac.ir/article-1-287-en.html}, eprint = {http://jrdms.dentaliau.ac.ir/article-1-287-en.pdf}, journal = {Journal of Research in Dental and Maxillofacial Sciences}, issn = {2588-4166}, eissn = {2383-2754}, year = {2020} }