Adhesive Bond Strength of Er Cr YSGG Laser Treated Deciduous Dentin to Resin Cements

The present study was performed to assess the adhesive bond strength of Er Cr YSGG laser treated deciduous dentin to resin cements. Forty deciduous teeth were collected and stored in saline solution for 24 hrs. The prepared specimens were divided into two groups, group A (control, n=10) and laser treated groups (B, C, D) (n=30). The control group specimens were treated with 37% phosphoric acid (Rely-X-ARC) while specimens in remaining groups underwent Er Cr YSGG laser treatment. Furthermore, the three laser groups were divided based on the types of the cement build-ups employed; Rely X ARC, Rely X Unicem and GIC. Cement builds up were placed on each specimen using a putty mould followed by light cure in the resin based cements. After storage in distilled water (twenty-four hrs), the prepared specimens were tested for shear bond strength in a universal testing machine. Collected data was analysed using Analysis of variance (ANOVA) and Tukey multiple comparisons test. A significant difference in bond strength between the groups (p< 0.05) was observed; however, the control group presented with highest shear bond strength of 25.38 (3.81) MPa among all groups. Specimens treated with laser and bonded to Rely X ARC and Rely X Unicem showed comparable (p>0.05) bond strength outcomes. Lased specimens bonded to GIC exhibited significantly lover bond strength compared to other laser treated groups (p<0.05). Among all groups the most common type of observed failure was adhesive followed by the admixed and cohesive (GIC-D) respectively. Both surface treatment (laser) and cement type showed significant influence on their bond strength to deciduous dentin