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Showing 5 results for Tabatabaei
In Vitro Cytotoxicity of Two Categories of Dental Cements
S Koosha, F Nematolahi, M Torshabi, F Tabatabaei, Y Borzoo, Am Vatandoost,
Volume 1, Issue 2 (6-2016)
Abstract

Background and Aim: Resin cements are used widely in restorative dentistry regardless of their biocompatibility. The aim of this study was to compare the cytotoxicity of two categories of dental cements consisting of three chemically set cements (Fuji I, Fuji PLUS and Harvard) and two dual curing cements (BisCem and Duo-Link) by use of MTT assay.

Materials and Methods: In this experimental study, four round-shaped samples of each specimen were placed in DMEM culture medium for 24, 48 and 72 hours. The extracts from each sample were applied on L929 mouse fibroblasts. At the end of each period, MTT assay was carried out to estimate the mitochondrial respiration. Data were analyzed by one-way analysis of variance (ANOVA) followed by Tukey's post-hoc test. The degree of cytotoxicity for each sample was determined according to the reference value of the control group.

Results: Fuji I cement showed the least cytotoxicity while Harvard and BisCem cements showed the highest cytotoxic effect. The differences were not significant compared to the positive control (distilled water).

Conclusion: This study showed that dental cements are capable of eliciting biological response in gingival and pulpal cells. They present a potential risk of tissue damage which depends on the cement's brand and curing modes.


Evaluation of the Prevalence of Dentin Hypersensitivity and Associated Factors: A Cross-Sectional Study
F Mahdisiar, S Nemati Anaraki, M Bineshian, F Tabatabaei,
Volume 4, Issue 3 (9-2019)
Abstract
Background and Aim: Dentin hypersensitivity (DH) is one of the most common problems in dentistry. Several factors affect DH. This study aimed to determine the prevalence of this problem and identify the associated factors.
Materials and Methods: In this cross-sectional study, 300 patients who referred to the operative dentistry department of Islamic Azad University of Medical Sciences, Tehran, Iran, were examined. Demographic information and other related factors were recorded using a questionnaire. One examiner then examined the subjects regarding the potential related clinical factors. DH was evaluated using evaporative and tactile tests and was categorized using the visual analog scale (VAS). Descriptive data were presented as frequency and mean. Chi-Square test was used to examine the related factors at the significance level of 0.05.
Results: The overall prevalence of DH was 21%. The correlation of horizontal brushing technique (P<0.005), hard toothbrushes (P<0.0001), gingival recession (P<0.0001), history of gingival surgery (P<0.001), tooth wear (P<0.001), traumatic occlusion (P<0.005), and bleaching toothpastes (P<0.005) with DH prevalence was significant.
Conclusion: According to the results, high awareness about DH and its associated factors is mandatory.

Influence of Light-Curing Units on Color Stability of Composite Resins After Aging
A Fakhari, H Heshmat, M Emami Arjomand , Sf Tabatabaei,
Volume 5, Issue 2 (5-2020)
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.


A Comparative Study of the Solubility and Sorption Properties of Resin Modified Glass Ionomer and a Bioactive Liner
H Heshmat, M Hoorizad Ganjkar, N Sanaei, Sf Tabatabaei, Mj Kharazifard,
Volume 7, Issue 3 (7-2022)
Abstract
Background and Aim: This study aimed to compare the sorption and solubility properties of ACTIVA BioACTIVE liner and resin modified glass ionomer (RMGI).  
Materials and Methods: In this in vitro study, a total of 30 samples were fabricated from each liner measuring 15 mm in diameter and 1 mm in thickness according to ISO 2009:4049. They were then divided into 6 subgroups (n=5) to assess their water solubility after 1 week and 8 weeks, water sorption after 1 week and 8 weeks, and acid solubility after 1 week and 8 weeks. The samples were then weighed, and placed in vials containing artificial saliva or lactic acid and incubated at 37°C for 1 week or 8 weeks according to specimen grouping. Afterwards, each specimen was weighed again. Sorption and solubility were calculated according to difference in weight of the samples. Data were analyzed by two-way ANOVA(alpha=0.05).
Results: RMGI showed greater water solubility and sorption compared with ACTIVA BioACTIVE liner after 1 week of storage (P=0.00). No significant difference was found in water solubility (P=0.64) and sorption (P=0.15) after 8 weeks of storage. There was no significant difference in acid solubility of RMGI and ACTIVA BioACTIVE liner after 1 week (P=0.30) or 8 weeks of storage (P=0.60)
Conclusion: Water sorption and solubility of RMGI were greater than those of ACTIVA BioACTIVE within the first week after setting but they were similar in long-term assessment. RMGI and ACTIVA BioACTIVE were not different in terms of acid resistance.

Effect of Acemannan/Aloe Vera on Bone Regeneration Specially in the Oral and Maxillofacial Region: A Literature Review
Mohammadreza Tabatabaeian, Vahid Esfahanian,
Volume 8, Issue 3 (8-2023)
Abstract
Background and Aim: With the advances in technology, the use of natural materials has broadened. Acemannan is the main polysaccharide in aloe vera plant. It is a natural and biocompatible polymer with low toxicity. The acemannan monomers include mannose, glucose and galactose. Due to its biological properties, acemannan could be useful in bone regeneration.  The aim of this study was to investigate the effect of acemannan/aloe vera on bone regeneration and extraction socket healing.  
Materials and Methods: In this review article, an electronic search was conducted in PubMed and Scopus from 1996 to June 2022.
Relevant data based on clinical indications were extracted. Twenty original articles, including 4 in vitro studies, 8 animal, and 8 human studies were reviewed. The inclusion criterion was articles that directly and originally evaluated the correlation of bone regeneration and acemannan/aloe vera.
Results: Over 30 studies were found in this field by database searching. According to the results, the proposed items could be categorized into 3 major groups of animals, human, and in vitro
studies. Animal studies were divided into two groups of bone defect regeneration and extraction socket healing. Also, human studies were divided into two groups of bone defect regeneration and sinus floor elevation/guided bone regeneration surgeries. All studies reported positive effect of Acemannan/aloe vera on bone healing and regeneration.
Conclusion: Acemannan/aloe vera may be considered as a bioactive molecule due to induction and acceleration of bone formation.


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