Showing 5 results for Alla
N Hoshyari, Z Allahgholipour, M Ahanjan, M Moosazadeh, M Zamanzadeh,
Volume 4, Issue 2 (6-2019)
Abstract
Background and Aim: Bacterial contamination of clinical surfaces of dental units that have been touched or been exposed to patients’ blood or saliva can be a reservoir for infections, leading to cross-contamination. This study aimed to evaluate bacterial contamination in the clinical environment of Sari Dental School in 2018.
Materials and Methods: In this cross-sectional (descriptive-analytical) study,
samples were randomly collected from 15 active dental units of five departments of Sari Dental School, including surgical, pediatrics, prosthodontics, endodontics, and restorative dentistry departments. Samples were collected from headrests, light handles, and dental seats using moist sterile swabs, and air samples were collected using agar plates. Sampling was carried out before and after dental practice. The samples were transferred to the microbiology laboratory to determine the number of various microorganism colonies. Data were analyzed using Chi-square, McNemar, and Kruskal-Wallis tests. P-values lower than 0.05 were considered significant.
Results: A significant difference was found between the frequency of contamination before and after clinical practice based on McNemar test results. Staphylococci were more prevalent on the surfaces. Kruskal-Wallis test revealed no significant difference in the total number of microorganisms between different departments after dental practice. Bacterial contamination of air was greater than other parts, followed by dental seats.
Conclusion: Microbial contamination of dental units considerably increases after treatment of each patient. Therefore, disinfection of dental unit surfaces and seats between each patient is essential. Also, methods of infection control must be supervised to prevent cross-infection.
F Sarkarat, Sa Vahdati, Hr Mahaseni Aghdam, Z Nematallahi, M Farahmand,
Volume 5, Issue 2 (5-2020)
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.
Mohammad Esmaeilzadeh, Nastaran Sadat Mahdavi, Masoud Fallahinejad Ghajari, Aliasghar Soleymani, Ahmad Eghbali, Taraneh Faghihi,
Volume 9, Issue 4 (12-2024)
Abstract
Background and Aim: This study compared the efficacy of buccal infiltration anesthesia (BIA) with articaine versus inferior alveolar nerve block (IANB) with lidocaine for pulpotomy of primary mandibular second molars under intravenous sedation.
Materials and Methods: This split-mouth randomized clinical trial was conducted on 29 uncooperative children (Frankl scores I & II) between 3-6 years with bilateral primary mandibular second molars requiring pulpotomy. After intravenous sedation, one random quadrant received IANB with 2% lidocaine and the respective tooth underwent pulpotomy with mineral trioxide aggregate and subsequent coronal restoration with a stainless-steel crown. The other quadrant received BIA with 4% articaine in the next session for pulpotomy of the respective tooth. The behavior of children was evaluated right after receiving the sedative (T0), during anesthetic injection (T1), during pulp exposure (T2), and in the recovery room (T3) using non-verbal pain scale-revised (NVPS-R). Data were analyzed by one-way and two-way repeated measures ANOVA (alpha=0.05).
Results: The odds of calmness of children during the entire procedure were 1.7 times higher in BIA than IANB but this difference was not significant (P=0.061). The mean heart rate (HR) of children was generally higher in IANB than BIA (P=0.04 at T1, P<0.001 at T2, and P=0.01 at T3). The effect of time on HR was also significant (P<0.001). Blood oxygen saturation rate (SPO2) was higher in BIA than IANB during the procedure (P<0.001).
Conclusion: BIA with articaine had optimal efficacy comparable to that of IANB with lidocaine for pulpotomy of primary second molars under sedation.
Vamsee Priya Golla, Satyanarayana Raju Mantena, Rama Krishna Alla, Vineeth Guduri, Suresh Sajjan Mc, Bheemalingeswara Rao D, Deepika Kandukuri,
Volume 10, Issue 1 (3-2025)
Abstract
Background and Aim: Several studies have investigated the effect of addition of fillers on mechanical strength of denture base materials. This study aimed to evaluate the mechanical properties of heat-cure denture base materials incorporated with different concentrations of zirconia nanotubes (ZNTs).
Materials and Methods: In this in vitro study, 90 specimens were fabricated from each denture base resin material (Trevlon and DPI) and divided into three groups (n=30) based on the mechanical properties to be tested (flexural strength, impact strength, and surface hardness). Thirty specimens in each group were further subdivided into 5 subgroups (n=6) based on the weight percentage (wt%) of ZNTs (0.0wt%, 0.5wt%, 1.0wt%, 2.0wt%, and 5.0wt%). The specimens were subjected to flexural strength, impact strength, and surface hardness testing using a universal testing machine, IZOD impact testing machine, and Vickers hardness tester, respectively. One-way ANOVA and post-hoc tests were used for statistical analyses (alpha=0.05).
Results: The maximum flexural strength was observed following the inclusion of 2.0wt% and 1.0wt% ZNTs in Trevlon and DPI, respectively. The maximum impact strength was obtained with the addition of 1.0wt% ZNTs to both Trevlon and DPI. The surface hardness of Trevlon and DPI increased significantly with an increase in the concentration of ZNTs (P=0.005). Flexural strength (P=0.000) and surface hardness (P=0.005) were significantly different among various concentrations of Trevlon and DPI, but the impact strength (P=0.013) was significantly different only in DPI.
Conclusion: The optimal concentration of ZNTs to obtain enhanced mechanical properties of denture base resins was found to be 1.0wt%.
Iman Parisay, Alireza Borouzi Niat, Ahmad Toumaj, Lida Bahramian, Mahdieh Tarkhani, Fatemeh Fallah Toosi, Homeira Mohammadi,
Volume 10, Issue 1 (3-2025)
Abstract
Background and Aim: This study compared the fracture resistance and esthetic appearance of reattached incisor tooth fragments with different preparation techniques in simulated crown fractures (CFs).
Materials and Methods: In this in vitro study, 50 permanent maxillary incisors were randomly divided into five groups (n=10). After induction of uncomplicated CFs, the fractured teeth were restored using five methods: (I) simple reattachment (SR), (II) circumferential chamfer (CC), (III) buccal scalloped bevel and lingual bevel (BSB&LB), (IV) buccal and lingual overcontour (BO&LO), and (V) buccal scalloped bevel and lingual overcontour (BSB&LO). After thermocycling, the fracture resistance of the teeth was measured, and their esthetic appearance was assessed using Easyshade spectrophotometer and the United States Public Health Service (USPHS) visual scale. One-way ANOVA, Tukey’s post-hoc test, and paired t-test were used to analyze the data (alpha=0.05).
Results: The secondary fracture resistance was significantly lower than the primary fracture resistance in the control (P=0.000), CC (P=0.01), BSB&LB (P=0.004), BO&LO (P<0.001), and BSB&LO (P<0.001) groups. The CC group showed a significantly higher secondary fracture resistance than the BO&LO group (P=0.02). Although a more favorable esthetic appearance was observed in the BSB&LB group, no significant difference was found in color difference (∆E) among the groups. Moreover, no statistically significant difference was detected among the study groups regarding the USPHS scale (P>0.05).
Conclusion: Restoration with the CC method may improve the fracture resistance of reattached fragments in simulated CFs in maxillary incisors. However, no considerable difference was found regarding the esthetic appearance among the tested techniques.
