Background and Aim: Microleakage is a drawback of composite restorations and it is more noticeable in dentinal walls. Despite advances in dentin bonding agents, no adhesive can completely eliminate microleakage and provide a hermetic seal. This study aimed to compare microleakage of three resin bonding agents namely a universal adhesive, two-step self-etch system and two-step total-etch system. Materials and Methods: This in vitro, experimental study was conducted on 68 human molars. Class V cavities were prepared in the buccal or lingual surfaces of the teeth with occlusal margins in the enamel and gingival margins in dentin. The teeth were then randomly divided into four groups of 17. Group A: Adper Single Bond 2, group B: Clearfil SE Bond, group C: Scotchbond Universal adhesive (self-etch) and group D: Scotchbond Universal adhesive (total-etch). The teeth were then restored using different bonding agents and a microhybrid composite resin. The specimens were then subjected to 1000 thermal cycles between 5-55°C. The entire restoration surface except for 1mm around the margins was coated with nail varnish. The teeth were immersed in 2% methylene blue for 24 hours and sectioned longitudinally in a buccolingual direction and observed under a stereomicroscope to determine microleakage. Microleakage in use of the three bonding agents was compared using the Kruskal Wallis test (P<0.05). Results: Based on the Kruskal Wallis test, no significant difference was noted in enamel and dentin margins among different adhesives but the enamel margin showed less microleakage than the dentin margin. Conclusion: Different adhesive systems tested in this study showed similar microleakage at the enamel and dentinal margins.
Background: The toxicity of the methyl methacrylate monomer is an ongoing concern in dentistry. Therefore, those who are involved with this substance need to be cognizant of how to work with it. Objectives: This study aimed to evaluate the level of working knowledge about methyl methacrylate among undergraduate prosthodontics students at Shahid Sadoughi university in 2014. Materials and Methods: In this descriptive cross-sectional study, the knowledge level of 54 undergraduate prosthodontics students, who had passed the last 2 years of their education, was assessed via a 13-question survey related to methyl methacrylate. Each correct answer was assigned 2 points, and the total sum of right answers was used to measure the knowledge level of each participant. In order to analyze the study data, SPSS16 was used to apply an ANOVA test, t-test, and Pearson correlation coefficient.
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