微型种植体支抗在正畸治疗双颌前突中切牙及磨牙位置变化的研究

目的：研究微型种植体支抗治疗双颌前突病例的，临床应用效果。方法：选择在沈阳市口腔医院正畸科就诊，符合纳入标准的双颌前突患者14例，随机分成2组，分别采用微型种植体与传统方法加强支抗，通过术前术后X线头影测量结果变化评价2种支抗方法的临床有效性。结果：2组患者在6～8个月后上下颌前牙内收均达到预定位置，实验组上下颌第一恒磨牙牙冠分别近中移动0、29mm和0．56mm，上下颌切牙切缘分别腭侧移动6．93mm和6．03mm；对照纽上下颌第一恒磨牙牙冠分别近中移动1．36mm和1．96mm，上下切牙切缘分别腭侧移动5．79mm和4．21mm。结论：微型种植体支抗完全可以代替传统支抗方法，满足正畸临床治疗双颌前突的需要，实现前牙最大程度的内收。

Position changes of incisors and molars in the treatment of bimaxillary protrusion with micro-implant orthodontic anchorage

Objective: To investigate the clinical outcome of bimaxillary protrusion following the treatment with micro-implant as (orthodontic) anchorage.Methods: Fourteen patients were selected according to the selection criteria and randomly divided into 2 groups: experiment group(using micro-implant as the orthodontic anchorage) and control group(using traditional orthodontic anchorage).Cephalometric measurements before and after the treatment were used to evaluate the clinical outcomes.Results: The anterior teeth reached the expected position in both groups 6 to 8 months after the treatment.The mesial movements of upper and lower first molars were 0.29 and 0.56 mm in experiment group and 1.36 and 1.96 mm in control group,and the retractions of upper and lower incisors were 6.93 and 6.03 mm in experiment group and 5.79 and 6.03 mm in control group.Conclusion: Micro-implant can provide necessary anchorage to retract the front teeth in the clinical treatment of bimaxillary protrusion.