Objective: The aim was to assess the influence of Er,Cr:YSGG laser (ECL) and fractional carbon dioxidelaser (FCL) on the shear bond strength (SBS) and microleakage of bioactive restorative material todentin.Methods: The study was performed in King Saud university in the month of June-July 2019. One hundredand twenty permanent teeth were vertically placed in acrylic resin. Based on the type of surfacetreatment regime (n=40), samples were divided into three groups. Group-I samples were surfaceconditioned with total etch and rinse (TE); Group-2 samples were surface treated with Er,Cr:YSGGlaser (ECL) and Group-3 specimens were conditioned with fractional carbon dioxide laser (FCL). Surfacetreatment of dentin was followed by type of bulk fill resin (BFR) application. Tetric-N-Ceram was bondedto dentin conditioned with TE (n=20), FCL (n=20) and ECL (n=20). Similarly, bioactive material (BAM) wasalso bonded to conditioned surface (n=60). Samples (n=10) among each group were placed in a Universaltesting machine. For microleakage testing 5 pairs of samples from each group (n=10) were placed insolution of 2% methylene blue for 24h Fracture analysis was performed using stereomicroscope at 40xmagnification. Descriptive statistics i.e., means and standard for SBS and microleakage were comparedusing analysis of variance (ANOVA) and Tukey’s post hoc test at a significance level of (p 0.05)Results: The highest SBS scores were displayed by TE-BFR (Bulk filled resin) (19.21 ± 0.925 Mpa) andthe lowest shear bond scores were presented by FCL-BFR (11.06±1.611 Mpa). The lowest microleakagescores were exhibited by group ECL-BFR (24.11±13.01nm). Similarly, the highest microleakage score wasdisplayed in group FCL-BAM (42.18±16.32 nm). Admixed failure was pertinent in groups conditioned byECL. Moreover, groups conditioned with FCL adhesive type of failure was found in abundance.Conclusions: ECL has a potential to be used as an alternate to total etch and rinse for conditioning ofdentin when bonded to bioactive materials.
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