Professor and Chair, Department of Orthodontic Science, Graduate School, Tokyo Medical and Dental University (TMDU), Bunkyo-ku, Tokyo, Japan; Congress Chair, 9th International Orthodontic Congress, Executive Committee, World Federation of Orthodontists (WFO), St. Louis, MO.
J World Fed Orthod. 2020 Oct;9(3S):S59-S66. doi: 10.1016/j.ejwf.2020.08.009. Epub 2020 Sep 30.
Since their introduction in the field of orthodontics, temporary anchorage devices (TADs) have been widely applied in the treatment of cases that have proven difficult to treat using conventional methods. Although TADs have broadened the scope of orthodontic treatment by modifying the envelope of discrepancy, whether they represent the ultimate solution in all cases remains controversial. Cone-beam computed tomography (CBCT) has recently been used to obtain three-dimensional images of the craniofacial skeleton and teeth. Thus, CBCT has clarified the three-dimensional morphology/configurations of structures that cannot be appropriately visualized using conventional imaging (i.e., cephalometric and panoramic radiographs). These structures include the incisive canal and maxillary sinus. In this review, I highlight the importance of understanding the mutual relationship between the roots of the maxillary teeth and these structures for diagnosis and treatment planning, as well as potential need to revise the envelope of discrepancy.
自正畸领域引入以来，临时锚定装置（TADs）已广泛应用于那些经传统方法证实难以治疗的病例。虽然 TAD 通过改变差异范围拓宽了正畸治疗的范围，但它们是否代表所有病例的最终解决方案仍存在争议。锥形束 CT（CBCT）最近被用于获取颅面骨骼和牙齿的三维图像。因此，CBCT 澄清了使用常规成像（即头影测量和全景片）无法适当可视化的结构的三维形态/构型。这些结构包括切牙管和上颌窦。在这篇综述中，我强调了理解上颌牙齿的根部与这些结构之间的相互关系对于诊断和治疗计划的重要性，以及对差异范围进行修正的潜在必要性。
