CBCT评估成人正畸治疗中前牙牙根吸收情况的前瞻性研究

Evaluation of anterior root resorption in orthodontic treatment using cone-beam computed tomography: a prospective study

目的:探索成人正畸治疗中前牙牙根吸收的发生率和严重程度。方法:对65例安氏Ⅰ类错颌畸形患者(共390颗前牙)正畸治疗过程中前牙进行3次锥形束电子计算机断层扫描(CBCT)追踪检查(治疗前、治疗6个月及治疗结束),比较治疗前到治疗6个月、治疗6个月到治疗结束这两阶段牙根吸收情况。结果:在治疗6个月时,牙根吸收大于1 mm在侧切牙中出现的频率最高。在治疗结束时,侧切牙发生牙根吸收大于1 mm的频率最高,其次是上颌中切牙。牙根出现吸收大于4 mm的情况仅出现于上颌中切牙和上颌侧切牙。92.3%的患者出现了至少1个牙超过1 mm的牙根吸收,6.15%的患者出现了1个或多个牙根吸收大于4 mm的情况。除外下颌侧切牙,其他患牙在治疗6个月后均出现了更为明显的牙根吸收,其中上颌侧切牙的牙根吸收增加具有统计学意义。结论:CBCT评价牙根吸收是一个有效而精确的手段。绝大多数正畸矫治患者均出现了不同程度的牙根吸收。

Objective： To investigate the incidence and severity of root resorption in adult orthodontic treatment.Methods： Roots of 390 anterior teeth in 65 patients with class Ⅰ malocclusion were assessed using cone-beam computed tomography（ CBCT） at pre-treatment,6-month treatment and post-treatment. Results： Root shortening 1 mm was found more frequently in lateral incisors after 6 months＇ treatment. At endpoint,root shortening 1 mm was also seen more frequently in lateral incisors,and followed by upper central incisors. Root shortening 4 mm were only found in upper central incisors and upper lateral incisors. 92. 3% of patients had at least one root with shortening 1 mm,and 6. 15% had one or more teeth with shortening 4 mm. All teeth showed more obviously root shortening after 6-month treatment than before,except for the lower lateral incisors. Statistically significant difference was only found in the upper lateral incisor. Conclusions： Most patients showed different degree of root resorption during orthodontic treatment,and CBCT is an effective and accurate method for the evaluation of root resorption.