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Application of Segmented Template in Three-Dimensionally Guided Mandibular Angle Osteotomy
Sizheng Zhou1, Zheyuan Yu, Huichuan Duan
1Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
The Journal of Craniofacial Surgery
|February 20, 2022
Summary
Custom 3D printed templates improve accuracy in mandibular angle osteotomy (MAO) surgery. This technique offers a feasible solution for precise bone cutting and favorable facial contouring outcomes.
Area of Science:
- Oral and Maxillofacial Surgery
- Biomedical Engineering
- Surgical Navigation
Background:
- Mandibular angle osteotomy (MAO) via intraoral approach presents challenges due to limited visibility and space.
- Uncertainty in osteotomy line and plane can result in severe complications.
- 3D printed guidance templates offer a potential solution for improved surgical precision.
Purpose of the Study:
- To retrospectively investigate the feasibility and accuracy of custom-made segmented templates for guiding MAO.
- To evaluate the effectiveness of template-guided osteotomy in achieving desired mandibular contouring.
Main Methods:
- Sixty patients undergoing segmented template-guided MAO were included.
- Preoperative simulations and postoperative CT scans were analyzed for key parameters.
- Paired t-tests and ICCs assessed efficacy, accuracy, and symmetry.
Main Results:
- Postoperative measurements showed a significantly larger mandibular angle and narrower gonion distance.
- High agreement (ICCs > 95%) between preoperative simulations and postoperative outcomes.
- Excellent bilateral symmetry (ICCs > 95%) was observed.
- Chin numbness was the most common complication, with full recovery within 3 months.
Conclusions:
- Custom-made segmented templates effectively guide the osteotomy plane in MAO.
- The technique ensures favorable accuracy and symmetry in mandibular contouring.
- Direct saw contact with the template enhances control over osteotomy line and plane angle.
