Al Shamsi Amna Hassan, Cunningham J Leo, Lamey Philip John, Lynch Edward
Restorative Department, School of Dentistry, Queen's University, Belfast, Northern Ireland, UK.
Am J Orthod Dentofacial Orthop. 2007 Mar;131(3):301.e9-15. doi: 10.1016/j.ajodo.2006.01.026.
The purpose of this study was to evaluate 3-dimensionally the changes on tooth surfaces after debonding orthodontic brackets and after removing residual adhesive and finishing.
Sixty premolars were randomly divided into 2 groups, and brackets were bonded according to the manufacturers' instructions. Two types of orthodontic adhesives were used: resin-modified glass ionomer cement (group 1) and resin-coated adhesive precoated brackets (group 2). The brackets were debonded on a testing machine at a cross-head speed of 1 mm per minute. Models were made of each tooth before bonding, after debonding, and after removal of residual adhesive. The models were scanned with a 3-dimensional laser scanning machine, and the scanned images were analyzed by using modified analytical software.
The Mann-Whitney test showed significant differences in adhesive thickness and enamel loss between the 2 groups (P <.001). The mean (+/- SD) thickness for group 1 was 31.2 microm (+/- 26.5 microm), and the mean (+/- SD) thickness for group 2 was 102.7 microm (+/- 79.71 microm). The means (+/- SD) for enamel losses after cleaning and finishing the enamel surfaces were 22.8 microm (+/- 17.67 microm) for group 1 and 50.5 microm (+/- 31.27 microm) for group 2.
Adhesive thickness and enamel loss due to orthodontic procedures can successfully be measured in vitro by using 3-dimensional laser scanning technology.
本研究的目的是三维评估正畸托槽脱粘后以及去除残留粘合剂并完成处理后牙齿表面的变化。
60颗前磨牙随机分为2组，按照制造商的说明粘结托槽。使用两种正畸粘合剂：树脂改性玻璃离子水门汀（第1组）和树脂涂层预涂托槽粘合剂（第2组）。在测试机上以每分钟1毫米的十字头速度使托槽脱粘。在粘结前、脱粘后以及去除残留粘合剂后对每颗牙齿制作模型。用三维激光扫描仪对模型进行扫描，并使用改良的分析软件对扫描图像进行分析。
曼-惠特尼检验显示两组之间在粘合剂厚度和釉质损失方面存在显著差异（P <.001）。第1组的平均（±标准差）厚度为31.2微米（±26.5微米），第2组的平均（±标准差）厚度为102.7微米（±79.71微米）。在清洁和处理釉质表面后，第1组釉质损失的平均值（±标准差）为22.8微米（±17.67微米），第2组为50.5微米（±31.27微米）。
通过使用三维激光扫描技术可以在体外成功测量正畸过程导致的粘合剂厚度和釉质损失。
