Thompson Michael A, Drummond James L, BeGole Ellen A
College of Dentistry, University of Illinois at Chicago, Chicago, Ill 60612-7212, USA.
Am J Orthod Dentofacial Orthop. 2008 Jan;133(1):9.e15-20. doi: 10.1016/j.ajodo.2006.12.010.
Various methods are used to prepare the cured composite-adhesive interface for orthodontic indirect bonding. The intent of this study was to determine the effect on the shear bond strength of the following variables: use of a filled flowable composite resin as an adhesive, light air-abrasion of the cured composite bracket pad, and wetting the cured composite bracket pad with an unfilled resin.
The sample of 240 brackets was divided into 2 groups of 120 each. The first group was further divided into 4 groups of 30 each. Brackets were bonded to bovine incisors with a filled flowable composite resin (Filtek, 3M ESPE, St Paul Minn), but the bracket pads were prepared differently in the 4 groups: unfilled resin was applied (Orthosolo, Ormco, Glendora, Calif), the surface was air abraded, the surface was air abraded followed by application of an unfilled resin (Orthosolo), and a control group. A matching sample of 120 brackets was bonded without the flowable composite as an adhesive. The different bracket pad preparations were chosen to represent the various techniques clinicians use in indirect bonding. The shear bond strength was measured on a universal testing machine.
Two-way ANOVA analysis showed significant differences in the shear bond strength among the different surface preparations, but not between the use and nonuse of flowable composite. The Scheffé test showed that the mean shear bond strength of the air-abraded surface was significantly higher than all other surface preparations.
Air abrading orthodontic bracket-pad composite surfaces in indirect bonding increased the shear bond strength, whereas the use of flowable composite did not affect bond strengths.
正畸间接粘结时，有多种方法用于处理固化后的复合树脂 - 粘结剂界面。本研究旨在确定以下变量对剪切粘结强度的影响：使用填充型可流动复合树脂作为粘结剂、对固化后的复合树脂托槽垫进行轻度空气喷砂处理以及用未填充树脂湿润固化后的复合树脂托槽垫。
将240个托槽样本分为两组，每组120个。第一组再进一步分为4组，每组30个。使用填充型可流动复合树脂（Filtek，3M ESPE，明尼苏达州圣保罗）将托槽粘结到牛的切牙上，但这4组托槽垫的处理方式不同：涂抹未填充树脂（Orthosolo，奥美科，加利福尼亚州格伦多拉）、对表面进行空气喷砂处理、先对表面进行空气喷砂处理然后涂抹未填充树脂（Orthosolo）以及一个对照组。选取120个托槽组成匹配样本，不使用可流动复合树脂作为粘结剂进行粘结。选择不同托槽垫处理方式以代表临床医生在间接粘结中使用的各种技术。在万能试验机上测量剪切粘结强度。
双向方差分析显示不同表面处理方式之间的剪切粘结强度存在显著差异，但使用和不使用可流动复合树脂之间无显著差异。Scheffé检验表明空气喷砂处理表面的平均剪切粘结强度显著高于所有其他表面处理方式。
在间接粘结中，对正畸托槽垫复合表面进行空气喷砂处理可提高剪切粘结强度，而使用可流动复合树脂并不影响粘结强度。
