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Updated: Mar 7, 2026
A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Three-dimensional analysis of the horizontal condylar angle in the temporomandibular joint: Morphology and surgical
Mingqi Ma1, Yi Mao2, Xuzhuo Chen1
1Department of Oral Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; College of Stomatology, Shanghai Jiao Tong University; National Center for Stomatology; National Clinical Research Center for Oral Diseases; Shanghai Key Laboratory of Stomatology; Shanghai Research Institute of Stomatology, Shanghai, China.
Objectives:
To develop a 3D measurement for horizontal condylar angle (HCA) and investigate its distribution across skeletal patterns and changes following orthognathic and disc repositioning sur-geries.
Materials And Methods:
Using a 3D reconstruction approach, 90 non-surgical patients were analyzed for HCA distribution. Surgical effects were evaluated in 50 orthognathic patients (preoperative, post-operative, and follow-up) and 30 disc repositioning patients (preoperative and >1 year postoperative).
Results:
HCA differed significantly among skeletal patterns (Class II: 23.97±11.81°; Class I: 19.05±11.03°; Class III: 13.61±7.35°). Mandibular advancement caused no immediate change but showed a reduction at follow-up, whereas mandibular setback resulted in a significant immediate increase that remained stable over time. In the disc repositioning group, HCA decreased significantly after surgery.
Conclusions:
HCA exhibits a skeletal pattern-specific distribution and adaptive changes following surgery. HCA serves as a simple and reproducible imaging descriptor for documenting morphological adaptation.
