Abstract
BackgroundMost cases of facial asymmetry involve yaw deformity, and determination of the yaw correction level is very difficult.MethodsWe use three-dimensional soft tissue simulation to determine the yaw correction level. This three-dimensional simulation is based on the addition of cephalometric prediction to gradual yaw correction. Optimal yaw correction is determined visually, and an intermediate splint is fabricated with computer-aided design and computer-aided manufacturing. Application of positioning devices and the performance of horseshoe osteotomy are advisable.ResultsWith this procedure, accurate repositioning of jaws was confirmed and patients obtained fairly good facial contour.ConclusionsThis procedure is a promising method for a widespread, predictable treatment of facial asymmetry.
Highlights
Most cases of facial asymmetry involve yaw deformity, and determination of the yaw correction level is very difficult
Most cases of asymmetry require correction of yaw, and changes in yaw have a significant influence on the facial contour
We developed 3D positioning devices [1, 2] to maintain the original position of the mandible during surgery
Summary
Treatment followed by two-dimensional (2D) analysis alone, such as cephalometric prediction, can achieve midline correction. It is insufficient for facial contour correction. Three-dimensional (3D) models and/or 3D simulation are often used to overcome this issue. Most cases of asymmetry require correction of yaw, and changes in yaw have a significant influence on the facial contour. Our strategy for facial asymmetry is as follows. Gradual changes in yaw are evaluated from various angles to determine the optimal correction of yaw.
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