Abstract: Objective    Compare the occlusal function change of patients with Class Ⅱ division 1 malocclusion before and after orthodontic treatment， to evaluate the influence of orthodontic treatment on occlusal contact change，which incorporated with the data of foreign and domestic researchers，to comparatively analyze the reliability for occlusal reconstruction and the instructional significance for clinics on Class Ⅱ division 1 malocclusion.  Methods    T-scan Ⅱ system 4.02 was used to record total occlusal force （TOF），asymmetry index of occlusal force （AOF），center of force （COF），maximal movement of COF （MMCOF）and time of occlusion （TO） before and after orthodontic treatment of 30 ClassⅡ division 1 malocclusion patients（age averaged 12.33 years） with integrity dentition in the maximum intercuspation（MIP），and T test was used for statistical analysis. Results    After orthodontic treatment，TOF was increased gradually， and there was significance between before and after orthodontic treatment，preoperative level （P＜0.05）. COF was in the grey ellipse，which was much closer to the center of grey ellipse and maxillary medial line to the preoperative level （P＜0.01）；AOF，MMCOF and TO were lower after treatment preoperatively，and significant difference was observed（P＜0.01）. Conclusions    The result suggest that，premature contact，occlusal interferences and other unbalanced occlusal diseases may exist in ClassⅡ Division 1 malocclusion，After orthodontic treatment，the occlusal force and balance on Class Ⅱ division 1 malocclusion patients can be improved. The occlusal contact the T-scan Ⅱ system reflects is objective，exact and precise，and the measurement results of T-scan Ⅱ could be the marker for the clinic.

Key words: Class Ⅱ division 1 malocclusion, T-scan Ⅱsystem, occlusal contact, center of force, occlusal function

摘要： 目的    研究安氏Ⅱ1错牙合矫治前后咬合功能状况的变化，借以评价正畸治疗对咬合接触变化的影响，并结合国内外学者的相关研究数据，对比分析本研究对安氏Ⅱ1错牙合咬合稳定重建的可靠程度及对临床的指导意义。方法    选取2008-2012年来济南市口腔医院正畸科就诊的安氏Ⅱ1错牙合患者30例，用T-scan Ⅱ数字化咬合分析系统记录患者矫治前后最大牙尖交错位的牙合力总值（TOF）、牙合力不对称指数（AOF）、牙合力中心点位置（COF）、牙合力中心点的最大位移（MMCOF）、闭合时间（TO），并进行统计分析。结果    安氏Ⅱ1错牙合患者矫治后TOF高于矫治前（P＜0.01）；矫治后COF距上颌中线的距离与矫治前相比减小（P＜0.01）；矫治后AOF、MMCOF、TO均低于矫治前（P＜0.01）。结论    正畸治疗能够改善安氏Ⅱ1错牙合患者的牙合力水平及平衡性；T-scan Ⅱ数字化咬合分析系统能够客观、真实、准确的显示咬合接触状态，其测量结果可作为临床评价的指标。

关键词: 安氏Ⅱ1错牙合, T-scan Ⅱ数字化咬合分析系统, 咬合接触, 牙合力中心点, 咬合功能