Lim L Y, Cunningham S J, Hunt N P
Department of Orthodontics, Eastman Dental Institute, University of London, England.
Int J Adult Orthodon Orthognath Surg. 1998;13(3):189-99.
This retrospective cephalometric study examined the stability of mandibular incisor decompensation following orthognathic treatment. It also studied the relationship between the mandibular incisor-mandibular plane angle (LIMnp) and the maxillary-mandibular planes angle (MMA). Two groups of 22 subjects each underwent either mandibular advancement only or bimaxillary surgery with mandibular setback. Serial radiographs of each subject were digitized. Twenty-seven Class I subjects who were part of the Leighton Growth Study served as the control. The control group showed a significant association between LIMnp and MMA. For the surgical groups, the only significant relationship between LIMnp and MMA was seen in the mandibular advancement group at debond. No definite indicator was found to suggest that the final MMA dictates the amount of mandibular incisor relapse following debond. Only the bimaxillary group showed an association between changes in LIMnp and changes in MMA during the review period.
这项回顾性头影测量研究检查了正颌治疗后下颌切牙去代偿的稳定性。它还研究了下颌切牙-下颌平面角（LIMnp）与上颌-下颌平面角（MMA）之间的关系。两组各22名受试者分别仅接受下颌前徙或双颌手术并伴有下颌后缩。对每个受试者的系列X线片进行数字化处理。作为对照组，选取了27名属于Leighton生长研究的I类受试者。对照组中，LIMnp与MMA之间存在显著关联。对于手术组，仅在下颌前徙组去除矫治器时观察到LIMnp与MMA之间存在显著关系。未发现明确指标表明最终的MMA决定去除矫治器后下颌切牙复发的量。在复查期间，只有双颌组显示LIMnp的变化与MMA的变化之间存在关联。
