College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People's Republic of China.
Center of Digital Dentistry, Faculty of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health, Beijing, 100081, People's Republic of China.
Med Biol Eng Comput. 2019 Jan;57(1):59-70. doi: 10.1007/s11517-018-1867-3. Epub 2018 Jul 2.
The abnormal occlusal contact can disrupt the coordination and health of the oral jaw system. Therefore, the dynamic adjustment of the occlusal surface is of great significance for assessing the status of occlusal contact and clarifying jaw factors of stomatognathic system diseases. To solve this problem, a trajectory subtraction algorithm based on screw theory to improve the accuracy of the occlusal movement trajectory is proposed in our paper. Driving by the relative trajectory, a virtual dynamic occlusal adjustment system is developed to realize 3D occlusal movement simulating, automatic occluding relation detection, and automatic occlusal adjustment. Furthermore, we adapt an active occlusal adjustment method based on Laplacian deformation to increase the contact areas of the occlusal surface, which can aid dentists to realize the automatic adjustment of the non-interference regions. As a consequence, the proposed subtraction algorithm is feasible and the root-mean-square is 0.097 mm, and the adjusted occlusal surface is more consistent with the natural occlusal morphology. Graphical abstract ᅟ.
异常的咬合接触会破坏口腔颌系统的协调性和健康。因此，咬合面的动态调整对于评估咬合接触状态和阐明口腔颌系统疾病的颌因素具有重要意义。为了解决这个问题，我们提出了一种基于螺旋理论的轨迹相减算法来提高咬合运动轨迹的准确性。通过相对轨迹驱动，开发了一个虚拟动态咬合调整系统，以实现三维咬合运动模拟、自动咬合关系检测和自动咬合调整。此外，我们采用基于拉普拉斯变形的主动咬合调整方法来增加咬合面的接触面积，这有助于牙医实现非干扰区域的自动调整。因此，所提出的相减算法是可行的，均方根为 0.097mm，调整后的咬合面更符合自然咬合形态。
