采用前后向舌侧滑动牵引系统控制前段：初步锥形束 CT 研究。
Control of anterior segment using an antero-posterior lingual sliding retraction system: a preliminary cone-beam CT study.
机构信息
Department of Orthodontics, Graduate School, Kyung Hee University, #1 Hoegi-dong, Dongdaemun-gu, Seoul, 130-701, Republic of Korea.
Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea.
出版信息
Prog Orthod. 2018 Jan 15;19(1):2. doi: 10.1186/s40510-017-0202-0.
BACKGROUND
This study was performed to evaluate the treatment effects of the antero-posterior lingual retractor (APLR), focusing on the 3-dimensional (3D) tooth movement of the maxillary anterior teeth and their alveolar bone levels.
METHODS
En masse retraction was performed using either the C-lingual retractor (CLR, C-group, n = 9) or the antero-posterior lingual retractor (APLR, AP-group, n = 8). We evaluated 3D movement of the maxillary anterior teeth and alveolar bone levels, root length of the central incisors, long axes of the maxillary canines, and occlusal plane changes from CBCT images.
RESULTS
After retraction, the central incisors were more significantly intruded and their root apex was more retracted in the AP-group. The long axis of the canine was well maintained in the AP-group. There were no differences in the steepness of occlusal plane and the incidence of alveolar bone loss or of root resorption during en masse retraction with the two retractors.
CONCLUSIONS
The clockwise bowing effect of the anterior segment was less with the APLR, which prevented unwanted canine movement.
背景
本研究旨在评估前后舌向牵引器（APLR）的治疗效果，重点关注上颌前牙的三维（3D）牙齿移动及其牙槽骨水平。
方法
使用 C 型舌向牵引器（CLR，C 组，n=9）或前后舌向牵引器（APLR，AP 组，n=8）进行整体后移。我们从 CBCT 图像评估上颌前牙的 3D 移动、牙槽骨水平、中切牙的根长、上颌尖牙的长轴和咬合平面的变化。
结果
后移后，上颌切牙更明显地内倾，根尖更向后退缩。尖牙的长轴在 AP 组中得到很好的维持。在使用两种牵引器进行整体后移时，咬合平面的陡峭度、牙槽骨丧失的发生率或牙根吸收的发生率没有差异。
结论
APLR 可减少前段的顺时针弯曲效应，从而防止不必要的尖牙移动。
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