Abstract
To assess and compare different conditioning regimes (laser and conventional) on shear bond strength (SBS) of resin modified glass ionomer cement (RMGIC) bonded to dentinal tissue. Sixty permanent intact human third molars were prepared and allocated into six groups (n=10 each). Group 1, dentin was conditioned with Nd-Yag laser (NYL), Group 2: Er, Cr:YSGG laser (ECL), group 3: total etch adhesive, group 4: self-etch adhesive resin, group 5: 25% polyacrylic acid (PAA) and group 6: no treatment group. After surface conditioning of all fifty samples resin modified glass ionomer cement (RMGIC) was mixed and build up was performed. For SBS testing, specimens (n=10) in each group were placed in a custom jig of a Universal testing machine. For the de-bonded surface fracture analysis was completed using stereomicroscope at 40x magnification. Descriptive statistics i.e., means and standard for SBS were compared using analysis of variance (ANOVA) and Tukey's post hoc test at a significance level of (p<0.05). The maximum SBS values were observed in PAA (20.44 +/- 3.92) and the minimum values were noted (12.54 +/- 2.25). RMGIC conditioned with NYI. (1145+2.44) and control group (12.45+2.25) were comparable p>0.05. In laser, irradiated groups admixed failure was common. Dentin conditioned with PAA exhibited cohesive failure. The use of ECL and not NYL has a protentional to be used as conditioning regime in clinical setting prior to application of RMGIC.