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Predicted Versus Attained Surgical Correction of Maxillary Advancement Surgery Using Cone Beam Computed Tomography

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Technical Report

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Uniform Services University of the Health Sciences Bethesda United States

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Purpose To evaluate the accuracy of predicting soft tissue changes from orthognathic surgery utilizing Cone Beam Computed Tomography CBCT and Mimicsregistered software. Methods Pre- and post- surgical CBCTs for eight LeFort I Maxillary Advancement patients were superimposed. Exact skeletal movements were measured and recreated within Mimics to create 3-D pre-surgical soft tissue predictions. Corresponding landmarks were identified on pre-surgical and final soft tissue matrices, and discrepancies were measured using Geomagic Studio. A panel of orthodontists then subjectively assessed the accuracy of the predictions using a visual analog scale. Results Only 31 of predicted landmarks fell within 2 mm of the actual result. The most accurate points were the right and left ala. Corners of the mouth and upper lip were least accurate. The panel deemed the actual results more esthetic than the predictions. Conclusion Orthognathic surgery soft tissue predictions via Mimics software were found to be inaccurate in this study, which were not consistent with the outcomes of previous studies. While there were many influential variables contributing to the statistically significant differences, one of the most important was the evident edema in the post-surgical CBCTs that were taken within four months of surgery.

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  • Medicine and Medical Research

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