Category: Laboratory Research
Effect of Setting Times on Shear Bond Strength Between Biodentin and Resin Composite
Apaporn Pasasuka*(papapo@kku.ac.th) | Ubonwan Tapsuria | Subin Puasiria
aFaculty of Dentistry, Khon Kaen University, Khon Kaen, Thailand
Objective: This in-vitro study aimed to evaluate the effect of different setting times on the shear bond strength (SBS) of Biodentine to resin-composite restoration using universal adhesive bonded.
Methods: Sixty cylindrical blocks with a uniform cavity (4mm diameter x 2mm height) were prepared from self-cure acrylic. Biodentine was mixed and loaded into the cavity. The prepared specimens were assigned into four groups (n=15) based on the timeframe of performance of composite restoration; group 1) 12 min, group 2) 24 h, group 3) 1 wk, and group 4) 2 wks. Specimens were stored (37 oC, 100% humidity). Upon the setting time, Single Bond Universal was applied on the surface of Biodentine (self-etch mode, following manufacturer’s instruction). A cylinder of composite resin (2mm diameter x 2mm height) was restored on the bonded surface. Then, specimens were kept (37 oC, 100% humidity) for 24 h before SBS testing. SBS was measured using a universal testing machine (1mm/min). The results were statistically analyzed using 1-way ANOVA and post hoc Bonferroni test at a 95% confidence interval.
Results: The mean SBS (MPa) of Groups 1, 2, 3, and 4 were 9.87(2.52), 14.16(2.19), 12.68(1.82), and 12.84(1.71), respectively. A statistically significant difference was found between group 1 and the other groups (p<0.05). No significant difference was observed among groups 2, 3, and 4.
Conclusion: Based on the results of this study, the final composite restoration should be performed at least twenty-four hours after Biodentine placement to obtain higher SBS.
Funding/Conflict of Interest: The authors declare no conflicts of interest.
Keywords: shear bond strength, adhesive, Biodentine
