正畸治疗前[牙合]架法分析错[牙合]患者髁突位置的临床研究

目的研究错牙合]畸形患者正畸治疗前在正中关系（centric-relation,CR）位与正中牙合]（centric-occlusion,CO）位时髁突位置的偏移情况及其影响因素。方法选取76例错牙合]]畸形患者为研究对象,获取CO位与CR位的咬合关系;利用AD2牙合]架和髁突移位测量仪记录髁突位置,分析CR-CO位时髁突位置的变化及其相关因素。结果 CR-CO位时,所有患者的髁突出现偏移,最多出现的髁突移位方向是趋于后下,77.6%的髁突偏移超出可接受生理范围,双侧髁突位移量明显呈现不对称性。髁突的移位量与咬合关系改变量无统计学上的相关性,与性别及错牙合]骨型亦不存在相关关系。结论正畸治疗前有必要分析错牙合]畸形患者CR-CO位的一致性,必要时转移牙合]架并从三维方向上更加准确地诊断患者,制定更加合理的治疗计划。

Condylar position of pre-orthodontic patients with malocclusion

Objective To study the condylar distraction and its influencing factors between centric relation（CR） and centric occlusion（CO） of pre-orthodontic patients with malocclusion. Methods seventy-six patients with malocclusion were recruited. The condylar distractions between CR and CO were measured by an AD2 articulator and Measurement of Condylar Displacement （MCD）. Results From CR to CO, all patients displayed a difference of occlusion. Mandible ro- tated to posterior-inferior direction. 77.6% condylar diastractions were beyond acceptable range. There was no correla- tion between condylar distraction amount and occlusion variation, gender and skeletal malocclusion. Conclusion Ortho- dontists should pay more attention on the high incidence of condylar displacement in pretreatment patients with malocclu- sion, measure condylar displacement to unmask real jaw relationships and avoid possible misdiagnoses.