Analysis of Surface Roughness of Enamel and Dentin after Er,Cr:YSGG Laser Irradiation

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Abstract
The purpose of this investigation was to compare the surface roughness of enamel and dentin following the Er,Cr:YSGG laser irradiation and acid etching. Laser-roughened enamel or dentin surfaces have been expected to enhance restorative materials bond strength. Er,Cr:YSGG laser irradiation was performed in one half of each polished enamel or dentin sample at 3 W (33.9 J/cm2, with air 70% and water 20%,) pulse energy for 6 sec. Then the other half was treated with 37% phosphoric acid for 30 sec. Surface roughness and morphological studies were performed. It was found that surface roughness was significantly increased with the laser system. Scanning electron microscopy analysis showed that irradiated surface produces a rough surface that was completely lacking of a smear layer; there was also no cracking of enamel or dentin. Er,Cr:YSGG laser irradiation could provide an effective and alternative method to the acid etch technique.

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