功能状态下下颌骨生物力学模型的建立

Development of a Functional Mandibular Model

为探讨建立正常下颌骨在功能状态下生物力学模型的可行性,我们利用完整干燥的下颌骨,采用硅橡胶模拟颞下颌关节盘等结构,通过在各肌肉中心点分别模拟咬肌(M)、颞肌(T)、翼内肌(M P)和翼外肌(LP)进行加载,成功地建立了包括颞下颌关节以及四组肌肉(M=180 N,T=190 N,M P=120 N,LP=40 N)同时加载的下颌骨生物力学模型。该模型比较真实地模拟了生理状态下下颌骨的受力情况,为下颌骨在各种生理状态下的生物力学研究创造了条件,并为下颌骨骨折的生物力学研究奠定了基础。

This study was conducted to establish a functional mandibular biomechanical model for use in the follow-up biomechanical study of the integrated and fractured mandible. The integrated and dry human mandible was used, and the corresponding maxilla and cranial base was duplicated by resin and plaster. 2-mm silicon rubber was used for simulation of the temporomandibular joint （TMJ） disc. A simulated TMJ and physiological mandibular model was developed by four pairs of muscular loadings （Masseter = 180 N, Temporalis = 190 N, Medial Pterygoideus = 120 N, Lateral Pterygoideus = 40 N） in each muscular center, and the functional loading corresponding with physiological condition was reflected and simulated more realistically when compared with that of the previously reported mandibular models which were developed by occlusion loading or by only one pair of muscles loading. In summary, we have established a functional mandibular model which can be used to analyze the biomechanical behavior in various functional conditions.