MXILLOFACIAL BIOMECHANICS IN MASTICATION OF JAW DEFORMITIES

颌骨畸形，即面部畸形，反映了各种美学问题，不能脱离个体性的解释。颌骨畸形在颌面部生物力学上也表现出不协调性。口腔颌面部生物力学的协调发展是保持口腔颌面部功能稳定的前提，颌骨畸形是口腔颌面部功能障碍的表现。因此，颌骨畸形的治疗不仅需要美学上的矫正，而且需要功能上的矫正。颌骨畸形的最佳治疗方案，包括功能矫正，需要了解颌骨畸形的生物力学问题，因此，对颌骨畸形的生物力学问题进行分析是非常重要的。本研究的目的在于表明，在颌骨畸形的矫正中，建立生物力学的协调是非常重要的通过对颌骨畸形手术前后的形态学、咀嚼功能和有限元分析的对比研究，发现颌骨畸形存在复杂的生物力学缺陷。通过对颌骨畸形手术前后的形态学和咀嚼功能的分析，发现颌骨畸形的颌面平衡建立后，颌骨功能有明显改善，有限元分析也表明，颌骨畸形的生物力学缺陷在颌面平衡矫正后有所减轻，但是，需要更仔细的检查以充分矫正颌畸形，因为颌畸形由许多因素组成。

Jaw deformities, namely, facial deformities indicate various esthetic problems that can not be leave within the explanation of individuality. Jaw deformities also show inharmony in maxillofacial biomechanics. Stable oral maxillofacial functions are sure to keep in harmonious maxillofacial biomechanics.Some oral maxillofacial dysfunctions are demonstrated in jaw deformities. Then the treatment of jaw deformities needs the correction of not only esthetic but also functional problems.The analyses of maxillofacial biomechanical problems are very important because the best treatment planing of jaw deformities including the functional correction needs to understand the problems of biomechanics in jaw deformities.The purpose of this study is to show that it is important to establish the biomechanical harmony in the correction of jaw deformities by the examination between the morphological, masticatory and finite elemental analyses of pre- and postoperative jaw deformities.A finite element method indicated jaw deformities had intricate biomechanical disadvantages. The morphological and masticatory analyses in pre- and post operative jaw deformities showed the establishment of the maxillofacial balance in jaw deformities indicated apparent improvement in the jaw functions.The analyses using a finite elemental method also showed decrease in the biomechanical disadvantages of the jaw deformities following the correction of maxillofacial balance.However, more careful examination for the sufficient correction of jaw deformities is needed because jaw deformities are composed of many elements.