Microtensile bond strength of bulk-fill restorative composites to dentin.

Autor:	Mandava J; Professor and Head of the Department, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam., Vegesna DP; Post Graduate student, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam., Ravi R; Senior lecturer, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam., Boddeda MR; Reader, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam., Uppalapati LV; Reader, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam., Ghazanfaruddin MD; Reader, Department of Conservative dentistry, GITAM Dental college and hospital, Visakhapatnam.
Jazyk:	angličtina
Zdroj:	Journal of clinical and experimental dentistry [J Clin Exp Dent] 2017 Aug 01; Vol. 9 (8), pp. e1023-e1028. Date of Electronic Publication: 2017 Aug 01 (Print Publication: 2017).
DOI:	10.4317/jced.53965
Abstrakt:	Background: To facilitate the easier placement of direct resin composite in deeper cavities, bulk fill composites have been introduced. The Mechanical stability of fillings in stress bearing areas restored with bulk-fill resin composites is still open to question, since long term clinical studies are not available so far. Thus, the objective of the study was to evaluate and compare the microtensile bond strength of three bulk-fill restorative composites with a nanohybrid composite. Material and Methods: Class I cavities were prepared on sixty extracted mandibular molars. Teeth were divided into 4 groups (n= 15 each) and in group I, the prepared cavities were restored with nanohybrid (Filtek Z250 XT) restorative composite in an incremental manner. In group II, III and IV, the bulk-fill composites (Filtek, Tetric EvoCeram, X-tra fil bulk-fill restoratives) were placed as a 4 mm single increment and light cured. The restored teeth were subjected to thermocycling and bond strength testing was done using instron testing machine. The mode of failure was assessed by scanning electron microscope (SEM). The bond strength values obtained in megapascals (MPa) were subjected to statistical analysis, using SPSS/PC version 20 software.One-way ANOVA was used for groupwise comparison of the bond strength. Tukey's Post Hoc test was used for pairwise comparisons among the groups. Results: The highest mean bond strength was achieved with Filtek bulk-fill restorative showing statistically significant difference with Tetric EvoCeram bulk-fill ( p < 0.003) and X-tra fil bulk-fill ( p <0.001) composites. Adhesive failures are mostly observed with X-tra fil bulk fill composites, whereas mixed failures are more common with other bulk fill composites. Conclusions: Bulk-fill composites exhibited adequate bond strength to dentin and can be considered as restorative material of choice in posterior stress bearing areas. Key words: Bond strength, Bulk-fill restoratives, Configuration factor, Polymerization shrinkage. Competing Interests: Conflict of interest statement:The authors have declared that no conflict of interest exist.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu