Kaley J, Phillips C
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill 27599-7450.
Angle Orthod. 1991 Summer;61(2):125-32. doi: 10.1043/0003-3219(1991)061<0125:FRTRRI>2.0.CO;2.
In a series of 200 consecutively debanded patients receiving comprehensive orthodontic treatment with the edgewise appliance, six (3%) showed severe resorption (greater than one-quarter of the root length) of both maxillary central incisors. For other teeth, resorption of this extent occurred in less than 1% of the patients. Using a case-control design, the characteristics of 21 patients with severe resorption were compared to randomly selected controls from the case series. There were significantly more Class III patients among the severe resorption cases than would have been expected. Risk indicators for resorption that were related to treatment procedures included approximation of the maxillary incisor roots against the lingual cortical plate (odds ratio 20), maxillary surgery (odds ratio 8), and root torque (odds ratio 4.5).
在一组连续200例接受方丝弓矫治器综合正畸治疗后解除矫治器的患者中，6例（3%）上颌中切牙出现严重吸收（超过牙根长度的四分之一）。对于其他牙齿，这种程度的吸收在不到1%的患者中出现。采用病例对照设计，将21例严重吸收患者的特征与从该病例系列中随机选择的对照组进行比较。严重吸收病例中的III类患者明显多于预期。与治疗程序相关的吸收风险指标包括上颌切牙牙根靠近舌侧皮质板（比值比20）、上颌手术（比值比8）和牙根转矩（比值比4.5）。
