Kim Daeseung, Kuang Tianshu, Rodrigues Yriu L, Gateno Jaime, Shen Steve G F, Wang Xudong, Deng Han, Yuan Peng, Alfi David M, Liebschner Michael A K, Xia James J
Department of Oral and Maxillofacial Surgery, Houston Methodist Research Institute, TX, USA.
Department of Surgery (Oral and Maxillofacial Surgery), Weill Medical College, Cornell University, New York, NY, USA.
Med Image Comput Comput Assist Interv. 2019 Oct;11768:336-344. doi: 10.1007/978-3-030-32254-0_38. Epub 2019 Oct 10.
Accurate prediction of facial soft-tissue changes following orthognathic surgery is crucial for improving surgical outcome. However, the accuracy of current prediction methods still requires further improvement in clinically critical regions, especially the lips. We develop a novel incremental simulation approach using finite element method (FEM) with realistic lip sliding effect to improve the prediction accuracy in the area around the lips. First, lip-detailed patient-specific FE mesh is generated based on accurately digitized lip surface landmarks. Second, an improved facial soft-tissue change simulation method is developed by applying a lip sliding effect in addition to the mucosa sliding effect. The soft-tissue change is then simulated incrementally to facilitate a natural transition of the facial change and improve the effectiveness of the sliding effects. A preliminary evaluation of prediction accuracy was conducted using retrospective clinical data. The results showed that there was a significant prediction accuracy improvement in the lip region when the realistic lip sliding effect was applied along with the mucosa sliding effect.
准确预测正颌手术后面部软组织的变化对于改善手术效果至关重要。然而，当前预测方法在临床关键区域，尤其是嘴唇部位的准确性仍需进一步提高。我们开发了一种新颖的增量模拟方法，使用具有逼真唇部滑动效果的有限元方法（FEM）来提高嘴唇周围区域的预测准确性。首先，基于精确数字化的唇部表面标志点生成唇部细节丰富的患者特异性有限元网格。其次，除了黏膜滑动效果外，通过应用唇部滑动效果开发了一种改进的面部软组织变化模拟方法。然后逐步模拟软组织变化，以促进面部变化的自然过渡并提高滑动效果的有效性。使用回顾性临床数据对预测准确性进行了初步评估。结果表明，当同时应用逼真的唇部滑动效果和黏膜滑动效果时，唇部区域的预测准确性有显著提高。
