A comparative evaluation of shear bond strength of the fifth-generation bonding agent treated with neodymium-doped yttrium aluminum garnet laser before and after polymerization: An in vitro study

Abstract

Objectives: Achieving higher bond strength is one of the most researched issues in adhesive bonding to dentin. Hard tissue modification by means of laser irradiation is becoming popular in dentistry. This study evaluates the shear bond strength of a commercially available adhesive system to dentin irradiated with Nd:YAG laser after adhesive application prior to and after polymerization of the bonding agent. Material and Methods: A group of 15 freshly extracted teeth were selected. Each one of these were disked proximally to expose the dentin. The teeth were randomly allocated into 3 groups. In Group 1, dentin was irradiated with Nd:YAG laser after the application of bonding agent but prior to ploymerization. In Group 2 dentin was irradiated with Nd:YAG laser after the application of bonding agent and subsequent polymerization. Group 3 served as control without irradiation with Nd:YAG. Shear bond strength was evaluated and the results were analyzed statistically. Results: There was statistical difference between group 1 when compared with group 2 and group 3. However there was no statistical difference between group 2 and group 3. Conclusion: Application of laser on bonding agent before curing can have significant increase in the bond strength