Abstract
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 ECL-ME (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.
Highlights
Clinical success of direct and indirect restorations requires an excellent adhesive bond between tooth and the restorative material
The highest mean shear bond strength (SBS) was observed in Group-4 ECL-C (21.55±3.08)
The present study was based on the hypothesis that dentine surface etched with ECL and bonded to BA cement will exhibit better SBS score to conventional dual cure cements
Summary
Clinical success of direct and indirect restorations requires an excellent adhesive bond between tooth and the restorative material. Adequate adhesion is a product of the agents used for the cementation of restorations.[1] Ideally, an appropriate luting cement must offer good marginal seal, optimal compressive, tensile and shear bond strength (SBS), resistance to dissolution in oral cavity, wettability and aesthetics.[2] In contemporary dentistry, dual cure luting cements are more acceptable among. Continued research in the field of materials has resulted in the introduction of bioactive (BA) resin cement for clinical use. BA cement displays better mechanical properties conventional cement, better marginal seal, is antibacterial, and is much durable with improved aesthetic properties.[5]
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