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Accuracy of Computational Soft Tissue Predictions in Orthognathic Surgery From Three-Dimensional Photographs 6 Months After Completion of Surgery: A Preliminary Study of 13 Patients

  • Original Article
  • Craniofacial/Maxillofacial
  • Published:
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Abstract

Background

This study aimed at a preliminary evaluation of the accuracy of computed three-dimensional (3D) predictions in orthognathic surgery by comparing predicted and real postoperative results.

Methods

Pre- and postoperative 3D photographs and time-matching computed tomography (CT) and cone-beam CT scans of the face of 13 patients with dentofacial deformities were analyzed. Three-dimensional photographs were fused with preoperative CT data using dedicated software (3dMDvultus, version 2.2.0.8). Postoperative CT data were superposed on the preoperative skull. With an activated rendering function, the osteotomies were simulated in the preoperative CT data and the bony segments moved to their real postoperative position, resulting in a textured soft tissue prediction. This computed skin surface was compared with the real postoperative result by dividing the face into a surgically treated lower half and an untreated upper half. A statistical quantitative analysis of the surfaces was performed.

Results

The mean differences between surfaces were +0.27 mm for the untreated upper half and –0.64 mm for the surgically treated lower half (p < 0.001). Averaged distributions of absolute errors showed more discrepancies between predicted and real postoperative results in the lower half of the face. Errors exceeding 3 mm were encountered in 4 % of the upper halves versus 29.8 % of the lower halves (p < 0.001).

Conclusions

The accuracy of a specific software platform for predicting 3D soft tissue changes after surgery was insufficient.

Level of Evidence IV

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Authors and Affiliations

  1. Service of Maxillo-Facial and Oral Surgery, Department of Surgery, Faculty of Medicine, Geneva University Hospitals, Rue Gabrielle-Perret-Gentil 4, 1205, Geneva, Switzerland

    Andrej Terzic & Paolo Scolozzi

  2. Department of Health and Community Medicine, Centre of Clinical Research and Division of Clinical Epidemiology, Faculty of Medicine, Geneva University Hospitals, Geneva, Switzerland

    Christophe Combescure

Authors
  1. Andrej Terzic
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  2. Christophe Combescure
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  3. Paolo Scolozzi
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Correspondence to Andrej Terzic.

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Terzic, A., Combescure, C. & Scolozzi, P. Accuracy of Computational Soft Tissue Predictions in Orthognathic Surgery From Three-Dimensional Photographs 6 Months After Completion of Surgery: A Preliminary Study of 13 Patients. Aesth Plast Surg 38, 184–191 (2014). https://doi.org/10.1007/s00266-013-0248-4

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  • DOI: https://doi.org/10.1007/s00266-013-0248-4

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