Related Experiment Video
Updated: Jul 2, 2026
07:11
Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants
Published on: May 23, 2020
How accurate is model planning for orthognathic surgery?
1Glasgow Dental Hospital & School, Glasgow University, 378 Sauchiehall Street, Glasgow, G2 3JZ, UK.
International Journal of Oral and Maxillofacial Surgery
|September 2, 2008
Summary
Model surgery predictions for orthognathic surgery showed inaccuracies in maxillary advancement and impaction, and mandibular setback. While not statistically significant, these errors highlight areas for improvement in surgical planning accuracy.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Surgical Planning
Background:
- Orthognathic surgery aims to correct skeletal discrepancies.
- Accurate pre-surgical planning is crucial for predictable outcomes.
- Model surgery is a common technique for pre-surgical simulation.
Purpose of the Study:
- To assess the accuracy of model surgery predictions in orthognathic surgery.
- To identify potential sources of error in the prediction and planning process.
Main Methods:
- Analysis of 46 patients undergoing Le Fort I osteotomy and/or mandibular setback.
- Comparison of cephalometric data from pre-operative, post-operative, and model surgery predictions.
- Statistical analysis to determine the significance of discrepancies.
Main Results:
- Maxillary advancement was under-predicted, while anterior impaction was over-predicted.
- Mandibular setback was greater than predicted by model surgery.
- No statistically significant differences were found between predicted and actual surgical changes (p<0.05).
Conclusions:
- Inaccuracies in model surgery prediction for orthognathic procedures were observed.
- Potential errors stem from face bow recording, intermediate wafer use, and patient positioning during surgery.
- Improving the transfer of prediction planning to model surgery is essential for enhancing accuracy and predictability.
