Effect of Er:YAG
Effect of Er:YAG Laser on Microtensile Bond Strength of Resin Composite to Recent Bleached Human Teeth
Ola. M. Sakr
Departments of Operative Dentistry, College of Dentistry, Qassim University (Saudi Arabia) and Misr University for Science and Technology (Egypt)
Abstract: The aim of this study is to evaluate the effect of dentin surface ablation with low energy density Er:YAG laser on bond strength of resin composite to recently bleached enamel. In this study, 40 human anterior teeth , the enamel surface bleached using 30% carbamide peroxide. Samples were abraded with 300 to 600-grit abrasive papers to obtain flat dentin surfaces .The bleached samples were divided into two groups: group A: no Er:YAG laser ablation before resin composite application ; group B:dentin surface ablated with 50 mJ of Er:YAG laser before resin composite application .The adhesive system (Adper Single Bond 2) was applied and composite tubes were constructed with Filtek Z350 composite. The teeth were sliced to 1 mm width , along the adhesive interface, thin slices of dentin-resin and submitted to microtensile bond testing. Scanning electron microscope examination and analysis of the samples .The data were statistically analyzed by the ANOVA. The mean and standard deviation values of microtensile bond strength were 31.7 ± 4 MPa and 24.6 ± 3.8 MPa for lased bleached and non lased bleached dentin , respectively. it was concluded that Er:YAG laser irradiation prior to adhesive procedure of bleached teeth promoted a dentin surface with no smear layer and opened dentin tubules observed under SEM. Conclusions: Within the limit of this in vitro study Er:YAG dentin irradiation after recent bleaching procedures promote bond strength of dentin to tested adhesive system.
[Ola. M. Sakr. Effect of Er:YAG Laser on Microtensile Bond Strength of Resin Composite to Recent Bleached Human Teeth. J Am Sci 2013;9(3):342-246]. (ISSN: 1545-1003).http://www.jofamericanscience.org. 48
Keywords: bleaching, Er:YAG laser , Microtensile bond strength and Scanning electron microscope . Full Text 48