Maeda Masahito, Katsumata Akitoshi, Ariji Yoshiko, Muramatsu Atsushi, Yoshida Kenji, Goto Shigemi, Kurita Kenichi, Ariji Eiichiro
First Department of Oral and Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya and Gifu, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 Sep;102(3):382-90. doi: 10.1016/j.tripleo.2005.10.057. Epub 2006 Apr 21.
The aims of this study were to characterize the symmetrical features of patients with facial deformities and to suggest a classification system for facial asymmetry based on 3-dimensional-computed tomography (3D-CT) evaluation.
Preoperative CT images were investigated for 49 patients with maxillofacial deformities. Asymmetry indices were calculated for some landmarks in the maxilla, mandibular body and the mandibular ramus regions.
Asymmetry was observed most frequently in the mandibular body region. The subjects were divided into 3 groups. Subjects without any asymmetry in the 3 regions were classified as Group I (44.9%). Groups II or III were defined for subjects without or with maxillary region asymmetry, respectively, and they were subcategorized. In Group IIA (8.2%), asymmetry was shown solely in the mandibular body region, and in Group IIB (18.4%), additional asymmetry was shown in the mandibular ramus region. Group IIIA (6.1%) showed asymmetry only in the maxillary region, and Group IIIB (22.4%) showed asymmetry in all 3 regions.
The 3D-CT classification for facial asymmetry has the potential to replace the conventional cephalometric classification.
本研究旨在描述面部畸形患者的对称特征，并基于三维计算机断层扫描（3D-CT）评估提出一种面部不对称分类系统。
对49例颌面部畸形患者的术前CT图像进行研究。计算上颌骨、下颌体和下颌支区域一些标志点的不对称指数。
下颌体区域最常出现不对称。受试者被分为3组。在这3个区域均无任何不对称的受试者被归类为I组（44.9%）。II组或III组分别针对无上颌区域不对称或有上颌区域不对称的受试者进行定义，并进一步细分。在IIA组（8.2%）中，仅在下颌体区域出现不对称，在IIB组（18.4%）中，下颌支区域出现额外的不对称。IIIA组（6.1%）仅在上颌区域出现不对称，IIIB组（22.4%）在所有3个区域均出现不对称。
面部不对称的3D-CT分类有可能取代传统的头影测量分类。
