The range of rotation of the mandible during virtual three-dimensional orthognathic surgery is small and may be similar to the hinge movement of the mandible. This current study offers a new method to move the mandible to the retruded contact position (RCP), a position of beginning hinge movement, during virtual three-dimensional orthognathic surgery. During this method, a three-dimensional skull model was reconstructed from the computed tomographic images in the Mimics software. Then the RCP in the patient could be obtained using Gothic arch tracer or swallowing method and was recorded using a wax plate, followed by transferring to plaster models. Subsequently, the plaster models in RCP were scanned using a dental surface scanner and imported into the Mimics software. Finally, we could move the mandible to the RCP based on the registration between the three-dimensional skull model and plaster model for simulating the hinge movement during virtual three-dimensional orthognathic surgery. This may be a small step forward for improving the accuracy of virtual three-dimensional orthognathic surgery.

中文翻译：

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通过整合石膏模型，将下颌骨移至伸出的接触位置，以模拟虚拟三维正颌外科手术中的铰链运动

在虚拟三维正颌手术中，下颌骨的旋转范围很小，可能与下颌骨的铰链运动相似。这项当前的研究提供了一种在虚拟三维正颌外科手术中将下颌骨移动到突出的接触位置（RCP）（即开始的铰链移动位置）的新方法。在此方法期间，在Mimics软件中从计算的断层图像中重建了三维颅骨模型。然后，可以使用哥特式弓形示踪剂或吞咽法获得患者的RCP，并使用蜡板进行记录，然后转移到石膏模型中。随后，使用牙科表面扫描仪扫描RCP中的石膏模型，并将其导入Mimics软件。最后，我们可以根据三维头骨模型和石膏模型之间的配准将下颌骨移至RCP，以模拟虚拟三维正颌手术中的铰链运动。这对于提高虚拟三维正颌外科手术的准确性可能只是一小步。