Dentin bond strength of bioactive cement in comparison to conventional resin cement when photosensitized with Er,Cr:YSGG Laser

Objective: The purpose of the present study was to assess dentin shear bond strength (SBS) and mode of bond failure of bioactive cement (BA) in comparison to conventional resin cement when photosensitized by Er,Cr:YSGG Laser (ECL). Methods: The present in-vitro study was carried out from March 2019 to May 2019. Sixty permanent non-carious, intact, non-fractured molars were isolated and mounted vertically in acrylic resin. Buccal surface of each molar tooth was ground, polished and surface treated with ECL. Ketac conditioner was applied on the surface washed and air dried surface. Tetric-N-Bond adhesive was applied on forty-five samples and light cured. The specimens were allocated into four groups (n=15) according to the type of cement used i.e., Calibra (C), BA, Variolink II (V) and Maxcem-Elite (ME). For SBS testing was performed using the universal testing machine. Eight samples from each group were assessed for modes of failure. Means and standard deviations were compared using analysis of variance (ANOVA) and Tukey's post hoc test at a significance level of p < 0.05. Results: The highest mean SBS was observed in group ECL-C (21.55 +/- 3.08). The lowest mean SBS was displayed in group ECL-ME (14.25 +/- 3.55). Mean SBS values for group ECL-C (21.55 +/- 3.08) and group ECL-V (20.74 +/- 4.15) were comparable (p <0.05). Similarly, SBS values of group ECL-BA (15.48 +/- 3.62) and group ECLME (14.25 +/- 3.55) were comparable (p <0.05). Conclusion: Dentin surface conditioned with Er,Cr:YSGG and bonded to C and V cements exhibit favourable bond strength values.