Cattaneo Paolo M, Kofod Thomas, Dalstra Michel, Melsen Birte
Aarhus University, Department of Orthodontics, School of Dentistry, Aarhus, Denmark.
Comput Methods Biomech Biomed Engin. 2005 Jun;8(3):157-65. doi: 10.1080/10255840500237953.
An approach was developed to evaluate the load transfer mechanism in the temporomandibular joint (TMJ) area before, during and after mandibular ramus elongation by distraction osteogenesis (DO). In a concerted approach using computer tomography, magnetic resonance imaging (MRI), and finite element analysis, three-dimensional numerical models based on a young male patient, with a dento-facial deformity were generated. The magnitude and direction of the muscle forces acting on the mandible were assessed using both values derived from the muscles volume and cross-section as retrieved from the MRI-scan data-sets and taken from the literature. The resistance of the soft tissue envelope towards elongation during the DO-phase was also included. The finite element analyses showed that before skeletal correction by DO the load transfer was asymmetrical with high peak stresses in the affected joint. Following ramus elongation a more symmetrical loading in TMJs was predicted. The reaction forces in the TMJs during DO were low.
开发了一种方法来评估下颌支牵张成骨术（DO）前后及术中颞下颌关节（TMJ）区域的负荷传递机制。通过计算机断层扫描、磁共振成像（MRI）和有限元分析的协同方法，生成了基于一名患有牙颌面畸形的年轻男性患者的三维数值模型。利用从MRI扫描数据集检索并取自文献的肌肉体积和横截面积值，评估作用于下颌骨的肌肉力的大小和方向。还包括软组织包膜在DO阶段对伸长的阻力。有限元分析表明，在通过DO进行骨骼矫正之前，负荷传递不对称，患侧关节存在高峰应力。下颌支伸长后，预计TMJ的负荷会更加对称。DO期间TMJ中的反作用力较低。
