Aim:The aim of this study was to evaluate the shear bond strength (SBS) of self-adhering flowable composites on the dentinal surface prepared with carbide and diamond burs.Materials and Methods:A total of 64 extracted mandibular molars were mounted on acrylic resin blocks, and the coronal part of the dentin was exposed and polished. Then, they were divided into Group 1 and Group 2 for carbide and diamond bur preparation, respectively. Two teeth in each group were evaluated under scanning electron microscope, ×500, to view the surface changes following the bur preparation. The remaining teeth were subdivided into Groups A, B, and C to be restored with Constic, Dyad™-flow, and Tetric N Flow composites, respectively. Then, the specimens were stored in distilled water at 37°C for 24 h, and then subjected to universal testing machine to evaluate the SBS and viewed under light stereomicroscope to evaluate the type of failure.Statistical Analysis:SPSS version 22 (IBM Corp) for Windows was used for statistical analysis. The values were subjected to ANOVA followed by Bonferroni post hoc analysis. The values between the groups were analyzed using Student's unpaired t-test.Results:Statistically significant differences in the SBS values were seen between Groups A and C (P < 0.001) and Groups B and C (P < 0.001). Statistically significant differences were seen in SBS values of Dyad-flow (Group B) (P < 0.004) and Tetric N flow (P < 0.007) for surfaces prepared with carbide and diamond burs.Conclusion:It was concluded that the SBS of Tetric-N Flow was higher than that of the experimental groups of Constic and Dyad-flow. Dentinal surface preparation with carbide bur resulted in higher SBS for Tetric N Flow and Dyad-flow but not for Constic.
Aims and objectives: Hypersensitivity is a multietiological clinical problem. Many desensitizing treatments have been advocated to reduce the hypersensitivity. The aim of this study is to evaluate the effect of few in-office desensitizing agents on the bond strength of composite restoration.Materials and methods: Forty-eight sound human premolars were used for the study. The occlusal surface of each teeth was grounded with a diamond disk to expose the flat dentin surface, polished with 120 and 320 silicon grit sand paper. The specimens were then divided into four groups (n = 12) based on the type of dentin desensitizing agent given. Group I was treated with Vivasens, group II was treated with MS Coat F, group III was treated with Solo Eze, and group IV served as a control where no desensitizing agent was used.The specimens were treated with one-step self-etch and restored with composites according to the manufacturer's instructions. The specimens were then stored in distilled water for 24 hours and subjected to Universal Testing Machine to check the tensile bond strength.Results: Statistical analysis of the data obtained revealed the mean values for the tensile bond strengths were 92.53, 71.07, 95.07, 160.28 N for groups I to IV respectively. These values were statistically significantly different between groups pretreated with desensitizing agents as compared with control group. Conclusion:Dentin pretreated with desensitizing agents has lower tensile bond strength with resin composites as compared with dentin that is untreated. Among the experimental groups, hydroxyethyl methacrylate (HEMA)-containing desensitizing agents had better bond strength compared with the fluoridecontaining agents.
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