Sugawara Junji, Kanzaki Reiko, Takahashi Ichiro, Nagasaka Hiroshi, Nanda Ravindra
Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Tohoku University, Sendai, Japan.
Am J Orthod Dentofacial Orthop. 2006 Jun;129(6):723-33. doi: 10.1016/j.ajodo.2005.08.036.
It is now possible to predictably move maxillary molars distally in nongrowing patients with the skeletal anchorage system (SAS) and to improve malocclusions without having to extract the premolars and regardless of the patient's compliance. The purposes of this study were to investigate the amount of distal movement of the maxillary first molars, the type of movement, the difference between actual and predicted amounts of distalization, and the relationship between the amount of distalization and age.
Twenty-five nongrowing patients (22 female, 3 male) successfully treated with the SAS were the subjects in this study. The amount and the type of distalization, the difference between predicted and resulting amounts of distalization, and the relationship between the patient's age and the amount of distalization were analyzed with wide-opening cephalometric radiographs.
The average amount of distalization of the maxillary first molars was 3.78 mm at the crown level and 3.20 mm at the root level. The amount of distalization at the crown level was significantly correlated with the average value of treatment goals (3.60 mm).
The maxillary molars were predictably distalized in accordance with the individualized treatment goals without regard to patient age and extraction of the third or second molars. The SAS is a viable noncompliance modality to move maxillary molars for distally correcting maxillary protrusions and malocclusions characterized by maxillary incisor crowding.
现在，使用骨骼锚固系统（SAS）可以在非生长型患者中可预测地将上颌磨牙远中移动，并且无需拔除前磨牙且不论患者的依从性如何即可改善错牙合畸形。本研究的目的是调查上颌第一磨牙的远中移动量、移动类型、实际远中移动量与预测值之间的差异，以及远中移动量与年龄之间的关系。
本研究的受试者为25例成功接受SAS治疗的非生长型患者（22例女性，3例男性）。使用大开闭口头颅侧位片分析远中移动的量和类型、预测远中移动量与实际远中移动量之间的差异，以及患者年龄与远中移动量之间的关系。
上颌第一磨牙在牙冠水平的平均远中移动量为3.78 mm，在牙根水平为3.20 mm。牙冠水平的远中移动量与治疗目标的平均值（3.60 mm）显著相关。
上颌磨牙可根据个体化治疗目标进行可预测的远中移动，而无需考虑患者年龄以及第三或第二磨牙的拔除情况。SAS是一种可行的非依从性矫治方法，可用于远中移动上颌磨牙，以矫正上颌前突和以上颌切牙拥挤为特征的错牙合畸形。
