Effect of Laser Treatment on Surface Morphology of Indirect Composite Resin: Scanning Electron Microscope (SEM) Evaluation

Abstract Introduction: The aim of this study was to evaluate and compare the Scanning electron microscope (SEM) of indirect composite conditioned by Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser, Neodymium-Doped Yttrium Aluminium Garnet (Nd:YAG) laserand Carbon Dioxide (CO۲) laser.Methods: ۱۸ indirect composite blocks (GC Gradia DA۲, Japan) with ۱۵ × ۱۰ × ۱۰ mm dimensions were made. The bonding surface of these blocks were polished, then the samples were divided into six groups as follow: Er:YAG laser with output power of ۰.۵ W and frequency of ۱۰ Hz, Nd:YAG laser with output power of ۰.۲۵, ۰.۵ W and frequency of ۱۰ Hz, CO۲ laser with output power of ۰.۵ W and frequency of ۱۰ Hz and ۵ Hz, and no treatment. Then, the surfaces were evaluated by SEM.Results: Irregularities were observed in Er:YAG laser samples compared to control group that produced suitable retention for adhesion of cements. Nd:YAG and CO۲ lasers showed melting areas.Conclusion: Among different lasers, Er:YAG laser can be used as an alternative technique for surface treatment of indirect composites. Keywords: Er YAG laser Nd YAG lasers CO۲ laser