Ma Wen-sheng, Dong Fu-sheng, Ren Gui-yun, Feng Li-xiao, Hou Yan
Department of Oral and Maxillofacial Surgery, School of Stomatology, Hebei Medical University, Shijiazhuang 050017, China.
Zhonghua Kou Qiang Yi Xue Za Zhi. 2008 Sep;43(9):546-50.
To investigate the effect of rapid canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance.
Twenty canines in 11 patients who needed first premolar extractions were involved. A tooth-borne, custom-made distractor was bonded right after the first premolar extraction and the interseptal bone resistance reduction. Three days post-operatively, the distractor was activated 0.1 mm three times a day. Orthodontic models, panoramic radiographs, periapical radiographs, electrical vitality test were assessed pre- and post distraction procedure and 3 months after the completion of the procedure.
The distraction procedure was completed in 18 to 35 days [mean (25.6 +/- 4.7) days], with the distal displacement of the canines ranging from 3.53 to 8.29 mm [mean (5.56 +/- 1.32) mm]. The canines showed a mean of 12.20 degrees distal tipping and 18.53 degrees rotation. The anchorage teeth showed an average of (0.76 +/- 0.75) mm mesial movement. The mesial contact point of incisors showed a mean of (0.67 +/- 0.55) mm lingual movement. There was no significant root resorption or long-time change on pulp vitality after distraction.
The canine distalization through distraction of the periodontal ligament after reducing interseptal bone resistance was an effective approach to move canines rapidly.
研究在降低牙槽间隔骨阻力后，通过牙周膜牵张快速远中移动犬齿的效果。
选取11例需要拔除第一前磨牙的患者的20颗犬齿。在拔除第一前磨牙并降低牙槽间隔骨阻力后，立即粘结一个牙支持式定制牵张器。术后3天，每天激活牵张器3次，每次0.1mm。在牵张过程前后及牵张完成后3个月，评估正畸模型、全景X线片、根尖片及牙髓活力电测试。
牵张过程在18至35天内完成[平均（25.6±4.7）天]，犬齿远中移位3.53至8.29mm[平均（5.56±1.32）mm]。犬齿平均远中倾斜12.20°，旋转18.53°。支抗牙平均近中移动（0.76±0.75）mm。切牙近中接触点平均舌向移动（0.67±0.55）mm。牵张后未出现明显的牙根吸收或牙髓活力的长期改变。
在降低牙槽间隔骨阻力后，通过牙周膜牵张远中移动犬齿是一种快速移动犬齿的有效方法。
