Weinberger S J, Foley T F, McConnell R J, Wright G Z
Division of Orthodontics and Pediatric Dentistry, University of Western Ontario, Faculty of Dentistry, London, Canada.
Angle Orthod. 1997;67(3):173-8. doi: 10.1043/0003-3219(1997)067<0173:BSOTCB>2.3.CO;2.
The present study compared tooth-bracket bond strengths using two types of ceramic brackets and three methods of polymerization: argon laser, conventional light, and chemical. Ninety extracted human premolars were prepared for bonding with pumice and gel etchant. Using single crystal alumina brackets with silanated bases, three groups of 15 teeth were bonded with one of the three polymerization methods. Similarly, three groups of 15 teeth were bonded with polycrystal alumina brackets with nonsilanated bases. Each bonded bracket was tested on an Instron tensile testing machine in shear mode to determine shear debonding strength. Fracture sites were recorded. Results demonstrated that (1) all combinations produced shear bond strengths greater than those considered clinically acceptable, (2) the mean shear bond strengths of the single crystal alumina brackets with silanated bases were significantly higher than those of the polycrystal alumina brackets with nonsilanated bases, and (3) no enamel fractures were found on debonding the chemically cured brackets while the light and laser groups exhibited a 10% rate of enamel fracture on debonding.
本研究比较了使用两种类型的陶瓷托槽和三种聚合方法（氩激光、传统光固化和化学固化）时的托槽粘结强度。选取90颗拔除的人类前磨牙，用浮石和凝胶蚀刻剂进行粘结准备。使用带有硅烷化基底的单晶氧化铝托槽，将三组各15颗牙齿分别用三种聚合方法之一进行粘结。同样，将三组各15颗牙齿用带有非硅烷化基底的多晶氧化铝托槽进行粘结。每个粘结托槽在Instron拉伸试验机上以剪切模式进行测试，以确定剪切脱粘强度。记录骨折部位。结果表明：（1）所有组合产生的剪切粘结强度均高于临床可接受的强度；（2）带有硅烷化基底的单晶氧化铝托槽的平均剪切粘结强度显著高于带有非硅烷化基底的多晶氧化铝托槽；（3）化学固化托槽脱粘时未发现釉质骨折，而光固化组和激光组脱粘时釉质骨折率为10%。
