Department of Orthodontics, University of Pavia, Pavia, Italy.
Angle Orthod. 2012 Jan;82(1):158-64. doi: 10.2319/033011-227.1. Epub 2011 Aug 1.
To test the null hypothesis that there is no significant difference in the shear bond strength (SBS) and Adhesive Remnant Index (ARI) scores of new vs reconditioned self-ligating brackets.
One hundred and twenty permanent extracted bovine teeth were embedded in resin blocks. Three different new and reconditioned self-ligating orthodontic brackets (Smart Clip [3M Unitek]; Quick [Forestadent]; and Damon3MX [Ormco]) were tested. Scanning electron microphotographs of the different new (groups 1, 3, and 5) and reconditioned (groups 2, 4, and 6) bracket bases were taken before starting the experiments. Brackets were then bonded to the teeth using an orthodontic adhesive and were then tested in shear mode using an Instron Universal Testing Machine. ARI scores were then recorded. Statistical analysis was performed to determine significant differences in SBS and ARI Scores.
Smart Clip and Damon3MX reconditioned brackets showed significantly lower SBS than did new ones. On the contrary, Quick reconditioned brackets showed significantly higher SBS than did new ones. No significant differences in ARI scores were found after the reconditioning process for the three different brackets tested.
The in-office reconditioning procedure alters the SBS of self-ligating brackets, although SBS values still remain clinically acceptable.
检验新的和再处理的自锁托槽的剪切粘结强度（SBS）和粘结残留指数（ARI）评分无显著差异的零假设。
将 120 颗恒磨牙嵌入树脂块中。测试三种不同的新的和再处理的自锁正畸托槽（Smart Clip [3M Unitek]；Quick [Forestadent]；和 Damon3MX [Ormco]）。在开始实验之前，拍摄了不同新的（组 1、3 和 5）和再处理的（组 2、4 和 6）托槽基底的扫描电子显微镜照片。然后使用正畸粘结剂将托槽粘结到牙齿上，然后使用 In stron 万能试验机以剪切模式进行测试。然后记录 ARI 评分。进行统计分析以确定 SBS 和 ARI 评分的显著差异。
Smart Clip 和 Damon3MX 再处理的托槽的 SBS 明显低于新的托槽。相反，Quick 再处理的托槽的 SBS 明显高于新的托槽。经过三种不同托槽的再处理过程，ARI 评分没有发现显著差异。
在办公室进行的再处理程序改变了自锁托槽的 SBS，但 SBS 值仍然在临床可接受的范围内。
