Basaran Güvenç, Ozer Törün, Berk Nükhet, Hamamci Orhan
Dicle University, Orthodontics, Faculty of Dentistry, Campus, Diyarbakir, Turkey.
Angle Orthod. 2007 Jan;77(1):117-23. doi: 10.2319/120605-426R.1.
To test the shear bond strength, surface characteristics, and fracture mode of brackets that are bonded to enamel etched with an erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser operated at different power outputs: 0.5 W, 1 W, and 2 W.
Human premolars that had been extracted for orthodontic purposes were used. Enamel was etched with an Er,Cr:YSGG laser system operated at one of three power outputs or with orthophosphoric acid.
The shear bond strength associated with the 0.5-W laser irradiation was significantly less than the strengths obtained with the other irradiations. Both the 1-W and 2-W laser irradiations were capable of etching enamel in the same manner. This finding was confirmed by scanning electron microscopy examination. The evaluation of adhesive-remnant-index scores demonstrated no statistically significant difference in bond failure site among the groups, except for the 0.5-W laser-etched group. Generally, more adhesive was left on the enamel surface with laser irradiation than with acid etching.
The mean shear bond strength and enamel surface etching obtained with an Er,Cr: YSGG laser (operated at 1 W or 2 W for 15 seconds) is comparable to that obtained with acid etching.
测试使用不同功率输出（0.5W、1W和2W）的铒铬：钇钪镓石榴石（Er,Cr:YSGG）激光蚀刻牙釉质后粘结的托槽的剪切粘结强度、表面特性和断裂模式。
使用因正畸目的而拔除的人类前磨牙。用三种功率输出之一的Er,Cr:YSGG激光系统或正磷酸蚀刻牙釉质。
与0.5W激光照射相关的剪切粘结强度明显低于其他照射方式获得的强度。1W和2W激光照射均能够以相同方式蚀刻牙釉质。扫描电子显微镜检查证实了这一发现。对粘结剂残留指数评分的评估表明，除0.5W激光蚀刻组外，各组间粘结失败部位无统计学显著差异。一般来说，与酸蚀相比，激光照射后牙釉质表面残留的粘结剂更多。
使用Er,Cr:YSGG激光（1W或2W功率下照射15秒）获得的平均剪切粘结强度和牙釉质表面蚀刻效果与酸蚀相当。
