microleakage of bulk-fill composites at two different time points
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abstract
objectives: microleakage is the main concern in composite restorations. this study aimed to compare the microleakage of two bulk-fill and one conventional composite at two different time points. methods: class ii cavities were prepared in 60 premolar teeth and divided into six groups of 20. groups 1 and 4 were incrementally filled with grandio composite. groups 2 and 5 were filled with x-tra fil bulk-fill composite. groups 3 and 6 were filled with tetric-n-ceram bulk-fill composite in one layer. the samples were thermocycled for 5000 cycles between 25-55°c. in groups 1-3, the samples were incubated for 24 hours and then immersed in 1% methylene blue dye. groups 4-6 were incubated for three months and then immersed in dye. all samples were mesiodistally sectioned and degree of microleakage was scored under a light microscope. the data were analyzed using mann whitney and kruskal-wallis tests. results: the results showed no significant difference among groups 1-5 and 6 in terms of microleakage (p>0.05) but a significant difference was noted between groups 1 and 4 in this regard (p=0.01). the microleakage in groups 4-6 was higher than that in groups 1-3 (p=0.02). also, microleakage in gingival margins was greater than that in occlusal margins (p=0.02). conclusion: the microleakage of bulk-fill composites is comparable to that of conventional composites both at 24 hours and three months after restoration.
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Journal title:
journal of dental school, shahid beheshti university of medical sciencesجلد ۳۴، شماره ۴، صفحات ۲۲۵-۲۳۴
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