固化光源对正畸托槽光敏粘结剂抗剪切强度及粘结剂残留指数影响的研究

Effects of Light-curing Units on Shear Bond Strength and Adhesive Remnant Index of Light-curing Orthodontic Adhesives

目的:研究普通卤素灯(QTH)和发光二级管灯(LED)对正畸托槽复合树脂光敏粘结剂(3M)和树脂加强型玻璃离子光敏粘结剂(GC)抗剪切力的影响,为临床正畸粘结材料和固化光源的选择提供一定依据。方法:选取新鲜拔除的第一双尖牙48颗,随机分为4组,使用不同粘结材料和不同光源配合粘结标准网底方丝弓托槽,采用微机万能材料实验机对托槽的粘结强度进行检测,同时记录粘结剂残留指数(ARI)。结果:3M抗剪切力及ARI值均显著大于GC(P<0.05);QTH和LED对3M和GC的抗剪切力及ARI值影响差别无统计学意义。结论:2种正畸光敏粘结剂抗剪切强度均符合临床要求,托槽去除后GC对牙面破坏较小;LED灯照可以节约一半光照时间并能达到普通卤素灯的光照效果,正畸托槽粘结建议使用LED灯作为固化光源。

Objective： To evaluate the effect of quartz--tungsten--halogen light（QTH） and LED curing systems on shear bond strength of resin adhesive （3M） and resin-modified glass ionomer adhesive （GC） ; and to provide ev idences for clinical chose of curing lights and orthodontic adhesives. Methods： 48 freshly-extracted human premo- lars were randomly assigned into 4 bonding groups （n= 12/group）, brackets were respectively bonded with different adhesives and Light-curing units. The shear bond strength of the adhesive system was evaluated with an Universal testing machine. Adhesive remnant index （ARI） scores were determined after bracket failure. Results： The shear bond strength and ARI of 3M was significant lager than GC（P〈0.05）. No matter which adhensive was used, no significant difference was found in shear bond strength and ARI between the LED and QTH. Conclusion： Both two kinds of light curing adhensives can satisfy the clinic need of orthodontics. Resin--modified glass ionomer adhesive has significantly less incidences of enamel failure. Orthodontic adhesives cured with LED was statistically equivalent to those cured with a QTH. LED can save the time and be suggested for the polymerization of orthodontic bonding adhesives.