Experimental data acquisition and Finite Element Analysis of kinetic aspects of functional occlusion in order to optimize dental reconstrucions

功能性咬合动力学方面的实验数据采集和有限元分析，以优化牙齿重建

基本信息

批准号：
280729065
负责人：
Professor Dr. Marc Schmitter
金额：
--
依托单位：
Institut für Mechanik (IFM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/280729065?language=en
关键词：
Experimental data acquisition Finite Element

项目摘要

Correct occlusion is an essential aspect of the fabrication of dental restorations. Because dental technicians produce prosthetic restorations outside the oral cavity, accurate transfer of movement of the mandible to dental laboratory conditions is mandatory. Dental restorations without interferences and with sufficient chewing ability can then be produced. In recent years prosthetic reconstructions have been increasingly produced by CAD/CAM. This enables special attention to be devoted to the individual functional condition of the patient. This enormous advantage can, however, be exploited only when both kinematic (= motion and deformation) and kinetic (= forces and stresses) data are recorded. Unfortunately, until now, kinematic data, exclusively, have been recorded and, therefore, used for construction of dental restorations. The motion of the teeth, the deformation of the mandible, the deformation of the periodontal gap and the articular disc, including all the tissues involved-during motion and during chewing could not previously be recorded. In addition, individual information about these dynamics during chewing and clenching and/or grinding (bruxism) of the teeth has not been available; such information might be essential, because extraordinarily high eccentric forces are developed during these activities, resulting in a high risk of failure of all ceramic or veneered dental restorations. In this context interference-free occlusion of the restoration, taking into account the aforementioned kinetic aspects, is mandatory. In this study this missing kinetic data would be acquired for 22 healthy subjects, by acquisition of biting/chewing forces, electric muscle activity, jaw movement, and MRI images. These data would enable improvement of an existing finite-element model (FEM) of the stomatognathic system, including the temporomandibular joints, all chewing muscles, the mandible, the teeth, the temporomandibular disc, and the periodontal system. This modification of the FEM, and its expansion for use with extreme geometry would enable simulation of the kinetic aspects of chewing and bruxism of the teeth. Finally, the simulations should result in the CAD/CAM-based reconstruction and production of interference-free occlusion, enabling optimization of occlusal aspects of these restorations, and, consequently, reduced technical complications, for example chipping and delamination of the ceramic restoration. Another objective of the use of these FEM is simulation of the loading of dental implants and such implant-supported suprastructures during chewing/bruxism. Because dental implants are connected rigidly to the bone, occlusal forces cannot be damped as they are for natural teeth; this results in greater stress on the suprastructures and the surrounding bone. On the basis of the results expected from such optimized FE simulations, these aspects can be taken into consideration during CAD/CAM-based manufacture of the suprastructures.

正确的闭塞是制造牙科修复体的重要方面。由于牙科技术人员在口腔外产生假肢修复体，因此必须准确地转移下颌骨向牙科实验室条件转移。然后可以产生牙齿修复体，没有干扰和足够的咀嚼能力。近年来，CAD/CAM越来越多地生产了假体的重建。这使得特别关注患者的个体功能状况。但是，只有在记录运动学（运动和变形）和动力学（=力和应力）数据时，才能利用这种巨大的优势。不幸的是，到目前为止，已经记录了运动学数据，因此用于牙齿修复体的构建。牙齿的运动，下颌骨的变形，牙周间隙和关节盘的变形，包括所有涉及干燥运动的组织以及在咀嚼过程中都无法记录。此外，在牙齿的咀嚼，握紧和/或磨碎（磨牙）期间有关这些动态的个人信息尚无；此类信息可能是必不可少的，因为在这些活动期间发展出非常高的偏心力量，从而导致所有陶瓷或贴面牙科修复体失败的高风险。在这种情况下，必须考虑到上述动力学方面的无干扰固定。在这项研究中，通过获取咬人/咀嚼力，电肌活动，下巴运动和MRI图像，将为22名健康受试者获取这种缺失的动力学数据。这些数据将能够改善气孔系统的现有有限元模型（FEM），包括颞下颌关节，所有咀嚼肌肉，下颌骨，牙齿，颞下颌椎间盘和牙周系统。 FEM的这种修饰及其与极端几何形状一起使用的扩展将模拟牙齿咀嚼和磨牙的动力学方面。最后，模拟应导致基于CAD/CAM的重建和产生无干扰的闭塞，从而优化这些修复的咬合方面，从而减少了技术并发症，例如陶瓷恢复的碎裂和分层。使用这些FEM的另一个目的是模拟牙齿植入物的负载和在咀嚼/磨牙期间的植入物支持的上基地设施。由于牙齿植入物与骨骼紧密连接，因此不能像天然牙齿那样抑制咬合力。这会导致对上基础设施和周围骨骼的更大压力。根据此类优化的FE模拟预期的结果，可以在基于CAD/CAM的上层制造中考虑这些方面。