Quast A, Santander P, Witt D, Damm A, Moser N, Schliephake H, Meyer-Marcotty P
Department of Orthodontics, University Medical Centre Göttingen, Göttingen, Germany.
Department of Orthodontics, University Medical Centre Göttingen, Göttingen, Germany.
Int J Oral Maxillofac Surg. 2019 Mar;48(3):347-354. doi: 10.1016/j.ijom.2018.09.001. Epub 2018 Sep 13.
Face-bow transfer is an essential step in articulator-based orthognathic surgery planning. However, it can be a source of inaccuracy. Virtual computer-based planning avoids this error through the use of direct patient-related three-dimensional imaging data. The aim of this prospective observational study was to determine the error of face-bow transfer three-dimensionally and correlate it to the different types of malocclusion. Orthognathic surgery performed on 38 patients (10 male, 28 female; mean (standard deviation) age 24.7 (6.9) years) was planned twice: first articulator-based with plaster models and second computer-based with surgery planning software. Both models were digitized and compared regarding the angle between the Frankfort horizontal plane and the occlusal plane. In most cases, the angle in the sagittal dimension was higher in the articulator-based model than in the computer-based model. The angle in the transverse dimension was as often under- as over-represented. The type of malocclusion, i.e. skeletal class, vertical relationship, and degree of asymmetry, had no significant impact on the amount of error. In conclusion, this study indicates that computer-based planning should be considered as an advantageous alternative in orthognathic surgery planning.
面弓转移是基于牙合架的正颌外科手术规划中的关键步骤。然而，它可能是误差的来源。基于虚拟计算机的规划通过使用与患者直接相关的三维成像数据避免了这种误差。这项前瞻性观察研究的目的是三维确定面弓转移的误差，并将其与不同类型的错牙合畸形相关联。对38例患者（10例男性，28例女性；平均（标准差）年龄24.7（6.9）岁）进行的正颌手术进行了两次规划：第一次基于牙合架，使用石膏模型；第二次基于计算机，使用手术规划软件。对两种模型进行数字化处理，并比较法兰克福水平面与咬合平面之间的角度。在大多数情况下，基于牙合架的模型在矢状维度上的角度高于基于计算机的模型。横向维度上的角度有时被低估，有时被高估。错牙合畸形的类型，即骨骼分类、垂直关系和不对称程度，对误差量没有显著影响。总之，这项研究表明，在正颌外科手术规划中，基于计算机的规划应被视为一种有利的替代方案。
