It is known by experience that habitual mastication of chewing in one side of the jaw is thought partly as the cause of TMD (temporomandibular disorders) . The theory of biomechanics is tried to apply to some cases in clinical dentistry from the standpoint of habitual mastication. In this article the applied cases of biomechanics are reported on the result of treatment and the change of posture. In conclusion, it is suggested that there may be a correlation between mastication and posture.
Under the physical function, occlusion, muscles and T.M.J. are bio-structurally connected one another. Cooperation during occlusion, muscles and T.M.J. is essential to establish comfortable and stable occlusion, and smooth mandible movement. In this treatise, using three dimensional comput-ed tomography (3D-CT), we have visualized condyle bone remodeling on the case, that mandibular deviation induced over loading on stomatognathic system and condyle bone erosion which was treated by occlusal reconstruction to C.R. position or physiologic mandibular position. This results suggested the effectiveness of normal loading for stomatognathic system.