Influence of Er Cr Ysgg, Er Yag and Conventional Treatment on the Shear Bond Strength of Self Etch and Self-Adhesive Resin Cements

The present study was designed to evaluate shear bond strength of dentin when bonded with self- etch and self-adhesive resin cements with ErCrYSGG laser (ErCrY) and Er-YAG (ErY) conditioning. Ninety extracted molar teeth were mounted and allocated into nine groups (n = 10) according to the dentine surface conditioning and type of cement. Three type of cement, Panavia, Rely-X and Maxcem were used in the study for comparison among the laser conditioning SBS values. All specimens were tested for shear bond strength using universal testing machine. Ten samples from each group were assessed for modes of failure. Data were assessed using analysis of variance and Tukey multiple comparisons test. The highest mean shear bond strength was observed in conventional treatment with Panavia cement application (21.51 (+/- 2.13) MPa) whereas the least mean shear bond strength was measured in Er-YAG conditioning along with Maxcem cement application (14.89 (+/- 3.48) MPa). The hypothesis was partly accepted as the influence of conditioning methods among different cements was comparable, except Panavia cement (p >0.05). Moreover, the SBS values were significantly influenced by the type of resin cement rather than the type of laser used in dentinal conditioning (P < 0.001). Among all groups the most common type of observed failure was adhesive. The study was revealed that the type of Self-etch and self-adhesive cements exhibited significant influence on their bond strength to laser treated (ErCrYSGG and Er-YAG) dentin compared to the type of surface conditioning.