3D-CT evaluation of facial asymmetry in patients with maxillofacial deformities
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Masahito Maeda1, Akitoshi Katsumata, Yoshiko Ariji
1First Department of Oral and Maxillofacial Surgery, Aichi-Gakuin University School of Dentistry, Nagoya and Gifu, Japan.
Objective:
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.
Study Design:
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.
Results:
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.
Conclusion:
The 3D-CT classification for facial asymmetry has the potential to replace the conventional cephalometric classification.
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