Apajalahti Satu, Peltola Jaakko Sakari
Department of Dental Radiology, Institute of Dentistry, University of Helsinki, Finland.
Eur J Orthod. 2007 Aug;29(4):408-12. doi: 10.1093/ejo/cjm016. Epub 2007 Jul 13.
The purpose of the study was to compare the incidence and severity of apical root resorption in patients treated with different orthodontic appliances and to evaluate the effect of treatment duration on the degree of apical root resorption. A further aim was to analyse the degree of apical root resorption in different tooth groups in patients presenting with root resorption. The sample consisted of 625 patients (269 males, 356 females) aged 8-16 years at the beginning of treatment. Active removable plates and fixed appliances were used most frequently. Following exclusion of poor quality radiographs, the final sample included 601 patients (348 females, 253 males). Root resorption in all tooth groups, except third molars, was evaluated from pre- and post-treatment panoramic radiographs. The correlation of root resorption with treatment modality and duration was studied using multinomial logistic regression analysis. Of the tooth groups, maxillary incisors showed apical root resorption most frequently, followed by the mandibular incisors. Root resorption was significantly correlated with fixed appliance treatment (P < 0.001). In addition, the duration of fixed appliances treatment was found to contribute significantly (P < 0.01) to the degree of root resorption. The mean duration of treatment in patients without root resorption was 1.5 years, whereas in those with severe resorption was 2.3 years. The most severe resorption was seen in the maxillary incisors and premolars. It is concluded that with a long duration of fixed appliance treatment, the risk of severe resorption increases. In patients where treatment is prolonged, a 6-month radiographic follow-up is recommended.
本研究的目的是比较使用不同正畸矫治器治疗的患者根尖牙根吸收的发生率和严重程度，并评估治疗持续时间对根尖牙根吸收程度的影响。另一个目的是分析出现牙根吸收的患者不同牙组的根尖牙根吸收程度。样本包括625例患者（男269例，女356例），治疗开始时年龄为8至16岁。最常使用的是活动可摘矫治器和固定矫治器。排除质量不佳的X线片后，最终样本包括601例患者（女348例，男253例）。除第三磨牙外，所有牙组的牙根吸收情况均根据治疗前和治疗后的全景X线片进行评估。使用多项逻辑回归分析研究牙根吸收与治疗方式和持续时间的相关性。在所有牙组中，上颌切牙根尖牙根吸收最为常见，其次是下颌切牙。牙根吸收与固定矫治器治疗显著相关（P < 0.001）。此外，发现固定矫治器治疗的持续时间对牙根吸收程度有显著影响（P < 0.01）。无牙根吸收患者的平均治疗持续时间为1.5年，而有严重吸收的患者为2.3年。上颌切牙和前磨牙的吸收最为严重。得出的结论是，固定矫治器治疗时间长，严重吸收的风险增加。对于治疗时间延长的患者，建议每6个月进行一次X线片随访。
