Taithongchai R, Sookkorn K, Killiany D M
Dental Department, Pramongkutklao Army Hospital, Bangkok, Thailand.
Am J Orthod Dentofacial Orthop. 1996 Sep;110(3):296-302. doi: 10.1016/s0889-5406(96)80014-x.
The purpose of the present study was to determine whether pretreatment measures of facial and dentoalveolar structure can be used to predict apical root shortening liability. Four hundred patients were randomly selected from the files of the Orthodontic Clinic at the Saint Louis University Health Sciences Center. Pretreatment and posttreatment periapical radiographs of maxillary central incisors and pretreatment lateral cephalometric radiographs were traced and measured. A large amount of apical root shortening was found in 2% of the sample. A relationship that was weak but highly significant statistically (r = 0.335; p < 0.01) was found between the amount of apical root shortening and the duration of active treatment. Several measures of dentoalveolar structure were also statistically significant. However, these measures did not account for enough of the observed variability to be clinically useful as a predictor. In the absence of a history of trauma or pretreatment signs of root resorption, pretreatment facial and dentoalveolar structure cannot be used to accurately identify persons who will experience a large amount of apical root shortening during the course of comprehensive orthodontic treatment with a fixed appliance.
本研究的目的是确定面部和牙槽骨结构的治疗前测量指标是否可用于预测根尖牙根缩短的可能性。从圣路易斯大学健康科学中心正畸诊所的档案中随机选取了400名患者。对上颌中切牙的治疗前和治疗后根尖片以及治疗前的头颅侧位片进行了描记和测量。在2%的样本中发现了大量的根尖牙根缩短。根尖牙根缩短量与积极治疗持续时间之间存在微弱但在统计学上高度显著的关系（r = 0.335；p < 0.01）。牙槽骨结构的几个测量指标在统计学上也具有显著性。然而，这些指标并未解释足够多的观察到的变异性，以至于在临床上无法作为有用的预测指标。在没有创伤史或牙根吸收的治疗前迹象的情况下，治疗前的面部和牙槽骨结构不能用于准确识别在使用固定矫治器进行综合正畸治疗过程中会出现大量根尖牙根缩短的患者。
