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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Cortical bone remodeling/tooth movement ratio during maxillary incisor retraction with tip versus torque movements.
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Cortical bone remodeling/tooth movement ratio during maxillary incisor retraction with tip versus torque movements.

机译：上颌切牙后移时的皮质骨重塑/牙齿运动比率，其中尖端运动与扭矩运动有关。

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摘要

The validity of the postulate "bone traces tooth movement" was examined on 40 Angle Cl II cases. It was hypothesized that a 1:1 cortical bone remodeling/tooth movement ratio is preserved during maxillary incisor retraction. The sample was divided into retraction with tip (13 patients), retraction with torque (18 patients), and control (9 patients) groups. Two time point cephalograms were analyzed with two superimposition techniques, SN at S and a newly developed static tooth analysis, with the maxillary left central incisor serving as a reference object. In both retraction with tip and retraction with torque groups, the postulate bone traces tooth movement was not preserved and a bone remodeling/tooth movement ratio of 1:2 and 1:2.35 was obtained, respectively. In retraction with tip movement, the apical one third of the root tipped labially reducing the superior area of labial maxillaris by 19%. However, due to the compensating effect of the retraction movement, no apex approximation to the labial cortical plate occurred (eliminating the hazard of root resorption, dehiscence, or fenestration). In retraction with torque movement, the increase in both superior (28%) and inferior (65%) labial maxillaris areas was indicative for the hazard of root approximation to the palatal cortical bone. It is recommended to use the 1:2 bone remodeling/tooth movement ratio as a guideline to determine the biocompatible range of orthodontic tooth movements. Furthermore, a judicious interplay between the two modes of retraction can prevent major biologic impairments associated with the ratio and can extend the orthodontic range of treatment.
机译：在40例角度II型病例中检查了假定的“骨骼痕迹牙齿运动”的有效性。据推测，在上颌切牙牵开过程中，皮质骨的重塑/牙齿运动比为1：1。样本分为针尖回缩（13例），扭力回缩（18例）和对照组（9例）。使用两种叠加技术（S处的SN和最新开发的静态牙齿分析）分析了两个时间点的脑波图，其中上颌左中切牙为参考对象。在带尖端的缩回和带扭矩的缩回中，假定的骨骼痕迹均未保留牙齿运动，并且骨重塑/牙齿运动比分别为1：2和1：2.35。在通过尖端运动缩回的过程中，根尖的三分之一向顶端倾斜，使上颌上唇的上部面积减少了19％。但是，由于回缩运动的补偿作用，未出现对唇皮质板的顶点近似（消除了牙根吸收，裂开或开窗的危险）。在通过扭矩移动进行回缩时，上颌上颌骨面积（28％）和下颌上颌骨面积（65％）的增加均表明了根部接近cor皮质骨的危险。建议使用1：2的骨骼重塑/牙齿运动比率作为确定正畸牙齿运动的生物相容性范围的准则。此外，两种退缩模式之间的明智相互作用可防止与该比例相关的主要生物学损伤，并可扩大正畸治疗范围。

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