青少年正畸治疗中影响牙根吸收的因素探讨

目的：探讨影响青少年错牙合]畸形患者正畸矫治后牙根吸收的相关因素。方法：选择已完成正畸固定矫治的青少年患者78例．在其矫治前后的曲面断层片上，对4个上切牙进行根尖形态的分析，以获得正畸矫治后牙根吸收的定性数据。在对受试者按年龄、性别、牙位、牙龄、拔牙与否及疗程分组后，利用SPSS12．0软件对所得数据进行非参数检验分析。结果：所有正畸患者都存在一定程度的牙根吸收，根尖形态分析显示：①牙龄ⅣA期患者比ⅢC期的患者存在更严重的牙根吸收（P〈0．01），但按年龄比较不存在显著差异；②拔牙组比不拔牙组有更加严重的牙根吸收（P〈0．01）；③疗程越长，牙根吸收也越明显（P〈0．05）；④牙根吸收的严重程度与性别及上切牙牙位之间无相关性。结论：在第二恒磨牙完全建验前（ⅣA期前）进行正畸治疗、不拔牙矫治、缩短矫治疗程，均可以减少正畸治疗中的牙根吸收。

Investigation of the possible factors related to root resorption during orthodontic treatment in adolescents

PURPOSE:The purpose of this study was to investigate the factors relating to root resorption after orthodontic treatment in teenage patients.METHODS:seventy eight teenage patients treated with fixed orthodontic appliances were selected for this study.Root resorption scores of the upper incisors were recorded qualitatively according to their apical root morphology in the panoramic radiographs before and after treatment.All subjects were grouped according to age,gender,tooth location,occlusion stage,extraction or nonextraction approach and treatment duration.Nonparametric tests was used for statistical analysis with SPSS12.0 software package.RESULTS:All patients presented root resorption of different degrees.The results showed that there was significant difference before and after occlusion establishment of the second molar(P<0.01),but no difference between different age groups;Root resorption in extraction group was more severe than in non-extraction group(P<0.01);Root resorption in extraction group was more severe in patients with longer treatment duration(P<0.05).There was no significant difference between different genders and different teeth locations.CONCLUSION:The results suggest that orthodontic treatment before occlusion establishment of the second molar,nonextraction approach and shorter treatment duration lead to less root resorption.