Barbosa V L, Almeida M A, Chevitarese O, Keith O
State University of Rio de Janeiro, Brazil.
Am J Orthod Dentofacial Orthop. 1995 Feb;107(2):159-64. doi: 10.1016/s0889-5406(95)70131-1.
Orthodontic brackets were bonded to 180 faces of 45 porcelain cubes that were divided into three groups according to their surface preparation. In group I, the glaze had been removed with a sandpaper disk, whereas in group II, it was maintained. A solution of acidulated phosphate fluoride (APF) gel was applied to the samples in groups I and II for 5 minutes after pumicing. In group III, the glaze had been removed with a coarse diamond bur. Each group was further divided into four subgroups, depending on whether a priming agent had been used, and the type of composite used to bond the brackets. Shear force was used to debond the brackets, and the results showed that the APF solution was unable to provide enough retention on porcelain surface to bond brackets. Mechanical retention, obtained with a coarse diamond bur, was necessary to increase bond strength, which can be further improved by chemical bonding, with a silane priming agent. Therefore bonding to porcelain is clinically possible and is an acceptable procedure in orthodontic treatment.
正畸托槽粘结在45个瓷块的180个面上，这些瓷块根据其表面处理方式分为三组。在第一组中，用砂纸盘去除了釉质，而在第二组中，釉质得以保留。在第一组和第二组中，在打磨后将酸化磷酸氟（APF）凝胶溶液应用于样本5分钟。在第三组中，用粗金刚砂车针去除了釉质。根据是否使用了底漆以及用于粘结托槽的复合材料类型，每组又进一步分为四个亚组。使用剪切力使托槽脱粘，结果表明APF溶液无法在瓷表面提供足够的固位力来粘结托槽。用粗金刚砂车针获得的机械固位对于提高粘结强度是必要的，通过使用硅烷底漆进行化学键合可进一步提高粘结强度。因此，与瓷粘结在临床上是可行的，并且是正畸治疗中可接受的程序。
