下颌支种植体支抗辅助下牙列内收的疗效评价

Clinical study of ramus implant anchorage for mandibular arch distalization

目的:应用下颌支种植支抗钉远中移动下颌牙列,评价该方法的有效性,探索牙移动的特点。方法:选择6例需要远中移动下颌牙列的患者,在双侧下颌支前缘植入种植支抗钉,加力于下颌尖牙远中,拉下牙列向远中移动。测量治疗前、后下颌切牙和第一磨牙冠根水平矢状向、垂直向位置,运用SPSS17.0软件包对治疗前、后各测量项目进行配对t检验,评价切牙和磨牙远中移动量及移动方式。结果:6例患者均获得较理想的治疗效果,达到正常覆牙合、覆盖和尖窝关系。下颌第一磨牙远中移动量在牙冠水平平均为4.88mm,在牙根水平平均为3.1mm,下颌切牙切缘远中移动平均为5.02mm,牙根远中移动平均为1.03mm。结论:下颌牙列可通过下颌支种植支抗技术获得有效的远中移动,磨牙达到整体移动,切牙主要为倾斜移动,该技术可用于前牙反牙合及前牙拥挤或唇倾的非拔牙矫正。

PURPOSE： To evaluate the efficiency of ramus implant anchorage for mandibular arch distalization,and determine the feature of tooth movement.METHODS： Six patients were selected to distalize mandibular arch with ramus implant anchorage.Position changes of mandibular first molars and incisors were measured in sagittal and vertical direction to evaluate the amount of molar and incisor distalization and character of tooth movement.SPSS17.0 software package was used for statistical analysis.RESULTS： The average amount of distalization of mandibular first molar was 4.88mm at crown level and 3.1mm at root level,and of mandibular incisor was 5.02mm at crown level and 1.03mm at root level.All of the lower arches were distalized successfully and achieving normal overjet and overbite.CONCLUSIONS： Significant true distalization of lower arch could be obtained by ramus implant as bony anchorage.The method could be used to correct anterior cross bite and mandibular anterior crowding or flaring without extraction.