减数正畸治疗的咬合接触特征分析

Study of Characteristics of Occlusal Contacts in Postorthodontic Extraction-treatment Patients

目的:了解不同人群ICP咬合接触特征的差异以及正畸治疗对咬合的影响。方法:选取20名个别正常牙合者(A组)、20名错牙合畸形者(B组)、30名正畸治疗结束者(C组),通过Tee-test咬合分析系统对全牙列总接触面积(Total contact area,TCA)、全牙列咬合总力值(Total occlusion Force,TOF)、单位面积力值、咬合力中心点位置(Centre of Force,COF)、牙合不对称指数(Asymmetry index of occlusal force,AOF)、全牙列牙合力分布等数据进行分析比较。结果:A组TCA、TOF显著大于B、C组(P<0.05);C组的单位面积力值略小于A组,COF、AOF略大于A组,其组间差异无统计学意义,B组与A、C组间差异有统计学意义(P<0.05);A、B组的最大咬合力分布在第二磨牙区,C组的最大咬合力分布在第一磨牙区(P<0.05);不同性别间3组咬合测量项目差异均无统计学意义。结论:通过正畸治疗,咬合接触明显改善,咬合均衡性好,但未达到个别正常牙合的理想状态,提示正畸治疗后期的精细调整很重要。

Objective：To understand the differences between occlusal contact features in different populations and investigate the influence of orthodontic treatment on occlusion contact features.Methods：Selected 20 individuals with normal occlusion（group A）,20 individuals with malocclusion（group B）,30 individuals of post orthodontic treatment（group C）,evenly distributed between male and female.Tee-Test occlusion analysis system was used to detect the full occlusal contact area,total of force（TOF）,force per unit area,asymmetry of force（AOF）,center of force（COF）,the percentages of the single teeth in dentition.Results：TCA,TOF value were significantly higher in group A（P〈0.05）.Group C showed lower value of the force per unit area and higher value of COF,AOF than group A,and group B showed significantly difference between two groups（P〈0.05）.The maximum bite force area was distributed in the second molar area in group A and B,but changed to first molar area in group C（P〈0.05）.The gender differences in occlusion contact features showed no significant difference in three groups.Conclusion：The function and stable of occlusion after orthodontic treatment showed better results compared to malocclusion but the results were not as positive as the individual normal occlusion.