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Updated: Mar 14, 2026
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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
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Improved Temporomandibular Joint Position After 3-Dimensional Planned Mandibular Reconstruction
Rajendra Sawh-Martinez1, Yassmin Parsaei2, Robin Wu3
1Resident, Section of Plastic Surgery, Department of Surgery, Yale University School of Medicine, New Haven, CT.
Summary
Virtual surgical planning (VSP) improved temporomandibular joint (TMJ) positioning in mandibular reconstruction. VSP led to reduced condyle shifts, enhancing precision and preserving anatomical relations in craniofacial surgery.
Area of Science:
- Craniofacial surgery
- Orthognathic surgery
- Biomedical engineering
Background:
- Virtual surgical planning (VSP) using computer-aided design and manufacturing (CAD-CAM) is increasingly used in craniofacial reconstruction.
- While VSP has shown benefits in operative performance, its impact on temporomandibular joint (TMJ) position and function requires further investigation.
- Radiographic analysis of postoperative outcomes is crucial for evaluating TMJ-related results.
Purpose of the Study:
- To analyze the radiographic detail of postoperative outcomes related to the temporomandibular joint (TMJ) after mandibular reconstruction.
- To compare the position and function of the TMJ in patients who underwent reconstruction with and without VSP.
- To evaluate the precision of VSP in maintaining normative anatomical relations of the TMJ.
Main Methods:
- A retrospective analysis of 16 patients who underwent mandibular reconstruction was performed.
- Patients were divided into two groups: traditional planning and VSP.
- Preoperative and postoperative computed tomography (CT) scans were used for 2D and 3D analysis of TMJ position, condyle movement, and cephalometric relations.
Main Results:
- Measurements of superior, anterior, and lateral condyle movements were comparable between pre- and postoperative groups for both traditional and VSP methods.
- VSP demonstrated a statistically significant decrease in superior, anterior, and lateral shifts of the ipsilateral condyle in left mandibular reconstructions.
- VSP also resulted in decreased changes in condylar and condylar neck angles, indicating improved precision.
Conclusions:
- Virtual surgical planning (VSP) in mandibular reconstruction leads to increased precision.
- VSP contributes to the preservation of normative anatomical relations of the temporomandibular joint (TMJ).
- These findings suggest VSP can enhance postoperative TMJ outcomes in craniofacial reconstruction.
