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Objective : To study the pulsed Nd: YAG laser irradiation on enamel - resin and dentin - the impact of the resin bond strength to explore the pulsed Nd: YAG laser in the resin filled in the meaning and scope of application. Methods: a : pulsed Nd: YAG laser irradiation on enamel - resin bond strength effects: Newly selected for extraction for orthodontic premolar 36 , were randomly divided into A, B, C, D four groups, each group 9 , and every single premolar buccal surface polished using diamond burs , buccal exposure , fixed on self- clot . With 240 # , 400 # , 600 # silicon carbide sandpaper spare . Preparation of filling the mold blocks of 2 × 2cm of stainless steel , thickness of 6mm, the center hollow rectangular parallelepiped made ??of 3 × 3 × 6mm, spare . A group treated with 35% phosphoric acid solution has a prepared buccal 30S, rinse 10 seconds , drying , coating Prime Bond NT adhesive light 20 seconds , Surefil resin filling , light . Group B 50mj, 15ppsNd: YAG laser quasi -contact scanning irradiation imbricated 25 seconds Tu Prime Bond NT adhesive , light 20 seconds , Surefil resin filling , light . Group C Tu AdperTM PromptTM binder , light 10 seconds , Z100 resin filling , light . Group D using 50mj, 15ppsNd: YAG laser quasi -contact scanning irradiation imbricated 25 seconds Tu AdperTM PromptTM binder , light 10 seconds , Z100 resin filling , light . These operations are in each group according to the manufacturer instructions , layering resin , each light 40 seconds . A, B, C, D group, physiological saline at 37 ℃ after filling temperature for 24 hours after the experiment and recorded for cutting shear strength values. Shear bond strength ( later known as shear strength ) divided by the maximum shear force bond area was reached that SBS = F / S. Using SPSS11.5 software package for single shear strength of each group
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