Wendl B, Droschl H, Muchitsch P
Department of Orthodontics and Dentofacial Orthopedics, University of Graz, Austria.
Eur J Orthod. 2008 Feb;30(1):100-7. doi: 10.1093/ejo/cjm094.
The aim of this in vitro study was to investigate both shear bond strength (SBS) by shear testing of indirectly bonded brackets, and the accuracy of a new transfer method, the Aptus bonding device (ABD). For comparison, the SBS of directly bonded brackets in two experimental arrangements was also measured. The precision of the positioning of the indirect bracket transfer was assessed by photographic superimposition and three-dimensional (3D) measurement of the bracket positions on the working and plaster models using a 3D laser scan. Statistical analysis was carried out by means of descriptive and explorative data using the SPSS program. To compare groups, a one-factor analysis of variance and post hoc tests (Tukey-HSD) were used. The level of significance was set at P < 0.05. SBS using indirect and direct bonding, with the same experimental arrangement and the same adhesives (Concise and Transbond), showed no significant differences. For direct bonding, using only one adhesive (Transbond), lower values were observed, but they were only statistically significant for the premolar teeth. The clinically required minimum bond strength of 6 MPa was achieved in all groups. Superimposition of the photographs of the indirectly bonded upper labial segment brackets showed no deviations. The results of the 3D measurement of the positions of the brackets on the working and plaster models only yielded small deviations (0.15 mm along the X-axis in the centre, 0.17 mm along the Y-axis, and 0.19 mm along the Z-axis). The ABD is a useful adjunct to bond placement and does not compromise bond strength.
本体外研究的目的是通过间接粘结托槽的剪切试验来研究剪切粘结强度（SBS），以及一种新的转移方法——Aptus粘结装置（ABD）的准确性。为了进行比较，还测量了两种实验设置中直接粘结托槽的SBS。通过摄影叠加以及使用三维（3D）激光扫描对工作模型和石膏模型上托槽位置进行三维测量，来评估间接托槽转移定位的精度。使用SPSS程序通过描述性和探索性数据进行统计分析。为了比较各组，使用了单因素方差分析和事后检验（Tukey-HSD）。显著性水平设定为P < 0.05。在相同的实验设置和相同的粘结剂（Concise和Transbond）下，间接粘结和直接粘结的SBS没有显著差异。对于直接粘结，仅使用一种粘结剂（Transbond）时，观察到较低的值，但仅在前磨牙上具有统计学显著性。所有组均达到了临床上所需的6 MPa的最小粘结强度。间接粘结的上唇段托槽照片叠加显示没有偏差。工作模型和石膏模型上托槽位置的三维测量结果仅产生了微小偏差（中心处沿X轴为0.15 mm，沿Y轴为0.17 mm，沿Z轴为0.19 mm）。ABD是粘结放置的有用辅助工具，并且不会损害粘结强度。
