【摘要】 目的:依据矫正治疗成功患者矫治前后的X线头影测量分析以及模型测量分析,研究正畸患者实际拔牙情形和拔牙指数(EI)的相关性。方法:选择矫治成功的错畸形病例141个,筛除EI拔牙指数值在150～155的临界病例21个,根据年龄及错分组,作拔牙指数EI准确性及相关性指标的回顾性检验。结果:拔牙指数EI对总样本中74.17%的病例做出了正确的预测,在青少年患者组中拔牙指数EI的预测一致率为81.63%,在成人组为69.01%,按错类型分类中,安氏Ⅰ类错病例总的一致率为75.00%,安氏II类错病例总的一致率为80.00%,安氏Ⅲ类错组中病例总的一致率为67.50%。总样本中拔牙指数EI对54例严重及中度拥挤病例所预测的一致率为68.52%,而对66例轻度拥挤病例的预测一致率为78.79%。结论:拔牙指数EI对矫治错畸形临床拔牙与否的判断中,无论是对安氏Ⅰ类、Ⅱ类、Ⅲ类错或是严重及中度拥挤组还是在轻度拥挤组,均有一定的指导意义。更多还原

【Abstract】 Objective:To investigate the correlation of Extraction Index(EI)and extraction in orthodontic treatment planning,by analysing the lateral cephlometic radiograh and the study model.Methods:Data were obtained from 14lsuccessful treated orthodontic cases.EI was calculated and 21 cases with EI critical value between 150 and 155 was excluded from the sample.Patients were divided into teenagers group and adults group;Categorizing the Patients into classⅠ,class Ⅱ,and class Ⅲ by Angle malocclusion method.Analyzing the function of congestion factor between the groups,and doing the retrospective test of EI at the same time.Results:Successful extraction prediction rate is 74.l7% in the total sample,81.63% in the teenagers group,69.01% in the adults group,75.00% in Angle ClassⅠcases,80.00% in Angle Class Ⅱ cases,67.50% in Angle Class Ⅲ cases,68.52% in severe crowding cases,and 78.79% in mild crowding cases.Conclusion:The EI can provide some useful information to the clinical decision of extraction in orthodontic treatment planning of different classes of Angle malocclusion with various degree of crowding.更多还原