effect of surface treatment with er;cr:yssg, nd:yag, and co2 lasers on repair shear bond strength of a silorane-based composite resin

background and aims. the aim of the present study was to compare the effect of surface treatment with er; cr:yssg, nd:yag, and co2 lasers on repair shear bond strength of a silorane-based composite resin. materials and methods. sixty eight cylindrical samples of a silorane-based composite resin (filtek silorane) were prepared and randomly divided into 4 groups as follows: group 1: without surface treatment; groups 2, 3 and 4 with surface treatments using er; cr:yssg, nd:yag, and co2 lasers, respectively. a positive control group (group 5) was assigned in order to measure cohesive strength. repair shear bond strength values were measured and data was analyzed using one-way anova and a post hoc tukey test at a significance level of α=0.05. results. there were statistically significant differences in repair shear bond strength values between group 2 and other groups (p < 0.05); and between group 1and groups 3and 4 (p < 0.001); however, there were no significant differences between groups 3 and 4 (p = 0.91). conclusion. the repair shear bond strength of silorane-based composite resin was acceptable by surface treatment with lasers.