Establishment and Evaluation of Three-dimensional Diagnosis Coordinate System for Mandibular Asymmetry Deformity

doi:10.13701/j.cnki.kqyxyj.2023.03.013

Abstract

Abstract: Objective: To compare the differences of four kinds of horizontal reference planes and three-dimensional coordinate systems in the evaluation of mandibular asymmetry deformity. Methods: Preoperative spiral CT scans of patients with dental and maxillofacial deformities were collected for retrospective analysis. After three-dimensional reconstruction, the symmetric group (40 cases) and the mandibular asymmetric group (40 cases) were classified. Four kinds of three-dimensional diagnosis coordinate systems (FHP, FHO, FHC, CHP) were constructed and the evaluation indicators of asymmetric deformities were screened. ROC curve was used to evaluate the difference of the three-dimensional coordinate system in the diagnosis of mandibular asymmetry deformity. Results: There were differences in the diagnostic effects of three-dimensional coordinate system constructed with different horizontal reference planes for asymmetric jaw deformity. The AUC area of CHP and those of FHP, FHO, and FHC was significantly different. The assessment effect on asymmetric patients from FHP was statistical different from those from FHO and CHP, and the assessment effect on both symmetric and asymmetric patients from FHC was statistical differences from those from FHO and CHP. Conclusion: It is reliable to establish three-dimensional coordinate system through bilateral orbitale. In clinical practice, bilateral orbital and right porion can be used to construct a three-dimensional diagnostic coordinate system for orthognathic surgical diagnosis and design.

Key words: orthognathic surgery, mandibular asymmetry deformity, three-dimensional diagnosis coordinate system, horizontal reference plane

TAI Yue, ZHU Zhaokun, HUANG Liwei, TANG Li, LUO En. Establishment and Evaluation of Three-dimensional Diagnosis Coordinate System for Mandibular Asymmetry Deformity[J]. Journal of Oral Science Research, 2023, 39(3): 254-258.

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