Dorminey Jason C, Dunn William J, Taloumis Louis J
Tri-Service Orthodontic Residency Program, Lackland Air Force Base, San Antonio, Texas 78236, USA.
Am J Orthod Dentofacial Orthop. 2003 Oct;124(4):410-3. doi: 10.1016/s0889-5406(03)00404-9.
When bonding orthodontic brackets to enamel, most orthodontists use a conventional technique of etching tooth enamel with phosphoric acid, placing a hydrophilic primer on the etched, rinsed, and dried surface, then bonding the bracket with an adhesive resin composite. New systems simultaneously etch and prime the tooth surface in preparation for bonding. The purpose of this study was to compare the shear bond strength of orthodontic brackets bonded to enamel with a conventional, multistep adhesive system and a self-etching primer adhesive system. In addition, a third group was included in which the air dispersion step in the self-etching primer system was omitted. Brackets were bonded to 108 extracted human molars according to 1 of 3 experimental protocols--group 1: conventional multistep adhesive (n = 36); group 2: self-etching primer system (n = 36); group 3: self-etching primer system without air dispersion (n = 36). Specimens were loaded to failure in a universal testing machine (Instron, Canton, Mass). Mean shear bond strengths in megapascals (standard deviation) were 11.3 (2.2), 11.9 (3.2), and 8.2 (2.8) for groups 1, 2, and 3, respectively. Data were subjected to 1-way analysis of variance at alpha =.05. The mean shear bond strength of the self-etching primer group in which the air dispersion step was omitted was significantly less than in the other 2 groups (P <.001). However, there was no difference in mean shear bond strength between the conventional, multistep adhesive system and the self-etching primer system when the primer was dispersed correctly (P =.34).
在将正畸托槽粘结到牙釉质上时，大多数正畸医生采用传统技术，即用磷酸蚀刻牙釉质，在蚀刻、冲洗和干燥后的表面涂抹亲水性底漆，然后用粘结树脂复合材料粘结托槽。新系统同时蚀刻和处理牙面以准备粘结。本研究的目的是比较用传统的多步骤粘结系统和自酸蚀底漆粘结系统将正畸托槽粘结到牙釉质上的剪切粘结强度。此外，还纳入了第三组，其中省略了自酸蚀底漆系统中的空气分散步骤。根据三种实验方案之一，将托槽粘结到108颗拔除的人类磨牙上——第1组：传统多步骤粘结剂（n = 36）；第2组：自酸蚀底漆系统（n = 36）；第3组：无空气分散的自酸蚀底漆系统（n = 36）。在万能试验机（英斯特朗公司，马萨诸塞州坎顿）上对样本加载直至破坏。第1、2和3组的平均剪切粘结强度分别为11.3（2.2）、11.9（3.2）和8.2（2.8）兆帕（标准差）。数据在α = 0.05水平进行单因素方差分析。省略空气分散步骤的自酸蚀底漆组的平均剪切粘结强度显著低于其他两组（P < 0.001）。然而，当底漆正确分散时，传统多步骤粘结系统和自酸蚀底漆系统之间的平均剪切粘结强度没有差异（P = 0.34）。
