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

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