Ferrario V F, Sforza C
Laboratory of Functional Anatomy of the Stomatognathic Apparatus, Faculty of Medicine and Surgery, University of Milan, Italy.
J Prosthet Dent. 1994 Aug;72(2):169-76. doi: 10.1016/0022-3913(94)90076-0.
In a previous article we reported on our development of a biomechanical analog of the human mandible and a simple support model was introduced. The model has been further developed to calculate the relative degree of load on the working and balancing sides of the temporomandibular joint during unilateral clench. The relative load on each joint is a function of the biting force, the geometric setting (subject's anatomy, points of application of the biting force on the dental arch and of the resultant of the forces of the masticatory muscles), and the value of the electromyographic asymmetry (relative contribution of working-versus balancing-side muscles) and activity indexes (relative contribution of masseter versus anterior temporal muscle of both sides). The proposed biomechanical model showed that the reaction forces that act on the temporomandibular joint during unilateral clench do not always load the balancing-side joint more than the working-side joint. Modifications of the asymmetry index changed the relative load between the two joints, and a higher temporal muscle activity increased the joint load on both the working and the balancing sides.
在之前的一篇文章中，我们报道了我们对人类下颌骨生物力学模拟物的开发，并介绍了一个简单的支撑模型。该模型已进一步发展，以计算单侧紧咬时颞下颌关节工作侧和平衡侧的相对负荷程度。每个关节上的相对负荷是咬合力、几何设置（受试者的解剖结构、咬合力在牙弓上的作用点以及咀嚼肌力量的合力）以及肌电图不对称值（工作侧与平衡侧肌肉的相对贡献）和活动指数（两侧咬肌与颞前肌的相对贡献）的函数。所提出的生物力学模型表明，单侧紧咬时作用于颞下颌关节的反作用力并不总是使平衡侧关节比工作侧关节承受更多负荷。不对称指数的改变会改变两个关节之间的相对负荷，而较高的颞肌活动会增加工作侧和平衡侧关节的负荷。
