RESUMEN
In recent years with the introduction of laser in dentistry, numerous researches have been conducted to evaluate its efficacy for improving resin material bond on the enamel and dentin. Based on the available literature, no research has been performed on resin shearing bond strength by preparing the tooth surface with YSGG laser on the enamel of the primary teeth. The present study seeks to determine and compare resin shearing bond strength between two groups of surface preparation with acid etch and laser. Twenty primary canine teeth which were extracted for orthodontic purposes were collected and were halved with a diamond disc. Each of the halves was mounted in transparent acrylic resin. The teeth were then randomly divided into two groups; in group 1, surface preparation was done with YSGG laser and in group 2, the teeth were prepared with acid etching. Next, the composite was put on the tooth surface by a plastic matrix and cured. The shearing bond strength was measured with instron. The collected data were analyzed using Student's t-test and Kolmogorov-Smirnov statistical methods. The average bond strength was 27.87 +/- 6.136 mpa in the laser group [group 1] and 21.55 +/- 5.62 mpa in the acid etch group [group 2] demonstrating a statistically significant difference between the two groups [p<0/05]. It may be concluded that resin bond strength is significantly higher in group 1 [YSGG group] compared with Group 2 [acid etch group]