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Accuracy of computer-assisted orthognathic surgery.

Giacomo De Riu1, Paola Ilaria Virdis1, Silvio Mario Meloni2

  • 1University of Sassari Hospital (Head: Dott. Giacomo De Riu), Maxillofacial Surgery Operative Unit, Viale San Pietro 43B, 07100, Sassari, Italy.

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|December 25, 2017
PubMed
Summary

PC-assisted orthognathic surgery using 3D software shows good accuracy for most jaw movements. Minor adjustments may be needed for specific facial parameters like anterior height, especially after genioplasty.

Keywords:
Computer-assisted orthognathic surgeryOrthognathic surgeryVirtual planning accuracyVirtual surgical planning

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontics
  • 3D Imaging Technology

Background:

  • Orthognathic surgery aims to correct jaw discrepancies.
  • Computer-assisted planning enhances surgical precision.
  • Evaluating the accuracy of virtual surgical planning is crucial.

Purpose of the Study:

  • To retrospectively evaluate the accuracy of PC-assisted orthognathic surgery.
  • To compare planned jaw movements with actual surgical outcomes.
  • To identify discrepancies in virtual surgical planning.

Main Methods:

  • Retrospective analysis of 49 patients undergoing PC-guided bimaxillary surgery.
  • Comparison of planned vs. actual jaw movements using 3D software.
  • Analysis of frontal and lateral cephalometries.

Main Results:

  • Overall accuracy was good, with nonsignificant differences in 12 of 15 parameters.
  • Significant differences noted for SNA, SNB, and anterior facial height.
  • Anterior facial height discrepancy was significant in patients who had genioplasty.

Conclusions:

  • Virtual surgical planning demonstrates good accuracy for most parameters (average error: 1.98mm linear, 1.19° angular).
  • A tendency for under-projection of jaws was observed, potentially due to condylar seating.
  • Refinements in 3D soft tissue simulation and intraoperative monitoring are needed for optimal outcomes.