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目的评价上中切牙正畸治疗后根吸收状况,探讨影响根吸收的相关因素。方法从大连大学附属口腔医院正畸科2名资深医生2007年5月至2009年12月所完成的正畸病例中,随机选择233例(男85例,女148例)。分为成人组90例,平均年龄(21.73±3.68)岁;青少年组143例,平均年龄(13.37±1.81)岁。通过分析治疗前后的头颅侧位片观察上中切牙牙根形态与长度变化,评价上中切牙根吸收状况。结果 233例患者中的13例上中切牙发生了不同程度的根吸收,根吸收发生率为5.58%。成人女性拔牙矫治组的上中切牙根吸收程度高于青少年女性拔牙矫治组,差异有统计学意义(P<0.05)。青少年组中,女性拔牙矫治患者的根吸收程度较男性拔牙矫治患者明显,差异有统计学意义(P<0.05)。而是否拔牙,其上中切牙根吸收程度差异无统计学意义(P>0.05)。结论女性拔牙矫治患者治疗后的上中切牙根吸收发生率较高。正畸根吸收原因复杂,治疗前应详细分析各种根吸收易发因素,以减小正畸根吸收的发生和程度,维持正畸牙齿的健康。
Objective To evaluate the root resorption after orthodontic treatment of upper incisors and to explore the related factors that affect root resorption. Methods A total of 233 orthodontic cases (85 males and 148 females) were randomly selected from two orthodontic departments affiliated to Stomatological Hospital of Dalian University from May 2007 to December 2009. Divided into adult group 90 cases, the average age (21.73 ± 3.68) years; adolescent group 143 cases, the average age (13.37 ± 1.81) years old. The changes of root morphology and length of the upper incisors were observed by analyzing the cephalometric slices before and after treatment to evaluate the root resorption condition of the upper incisors. Results In the 233 cases, 13 cases of upper incisors had different degrees of root resorption, and the root absorption rate was 5.58%. The degree of root resorption of the upper incisors in adult female tooth extraction group was higher than that in young female tooth extraction group, with significant difference (P <0.05). In the adolescent group, the degree of root resorption in female patients with tooth extraction was significantly higher than that in male patients with tooth extraction (P <0.05). There was no significant difference in the degree of root resorption between the two groups (P> 0.05). Conclusion The incidence of root resorption of the upper incisors after the treatment of female tooth extraction is high. The root causes of orthodontic root absorption are complex. Before treatment, various root absorption factors should be analyzed in detail so as to reduce the incidence and extent of orthodontic root resorption and maintain the health of orthodontic teeth.