Mascia V E, Chen S R
Am J Orthod. 1982 Sep;82(3):211-6. doi: 10.1016/0002-9416(82)90141-5.
One hundred twenty freshly extracted human incisor teeth were bonded with several different brands of direct-bonding brackets and tested for retention prior to and after recycling of the brackets by two different commercially available methods. Measurements of shearing strengths were performed to observe any possible changes in the retentive properties of the brackets. The teeth were preconditioned by the application of adhesive material, followed by scaling and pumicing to remove any visible signs of composite. After bonding of the teeth and recording of retentive strengths, the brackets were recycled and the same teeth (after scaling and pumice) were rebonded and tested once more. A decrease in retentive strength was noted in all types of recycled brackets. One type of bracket showed a statistically significant change in strength, depending on the process used in recycling, while the other brackets did not show any difference between the two processes. A control consisting of twenty teeth bonded only once and twenty teeth bonded several times showed no statistically significant change in retention of brackets.
120颗新鲜拔除的人类切牙用几种不同品牌的直接粘结托槽进行粘结，并在通过两种不同的市售方法对托槽进行再处理之前和之后测试其固位力。进行剪切强度测量以观察托槽固位性能的任何可能变化。通过施加粘结材料对牙齿进行预处理，然后进行洁治和打磨以去除复合材料的任何可见痕迹。在牙齿粘结并记录固位强度后，对托槽进行再处理，并且对相同的牙齿（在洁治和打磨之后）再次粘结并测试。在所有类型的再处理托槽中均观察到固位强度下降。一种类型的托槽根据再处理所使用的方法在强度上显示出统计学上的显著变化，而其他托槽在两种方法之间未显示出任何差异。由仅粘结一次的20颗牙齿和粘结几次的20颗牙齿组成的对照组在托槽固位方面未显示出统计学上的显著变化。
