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Analysis of masticatory movements in children using three-dimensional dynamic simulation model

三维动态模拟模型分析儿童咀嚼运动

基本信息

批准号：
10671938
负责人：
YAMASAKI Youichi
金额：
$ 2.05万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In order to investigate the developmental steps of stomatognathic function, we have researched into mandibular movement, masticatory muscle activity, occlusal facet and occlusal force of children with of normal occlusion. These results clarified that children showed the different characteristics in stomatognathic function from adults. However, to estimate biomechanical development of occlusal function in growing children, dysfunction of malocclusion, and recovery process from the masticatory dysfunction through the treatments, the visual estimation of mandibular movements in three-dimensions must bring us much more benefits in this research aspect. The computer simulation technology is widely used for analyzing movements of solid structures in the industrial world. This method is also thought to be useful for analyzing teeth, mandibular dentition and teeth contact situation, however to apply this method into the field of dentistry, various and accurate parameters must be obtained to make solid dentition models, and dynamic characteristic of mandible and head during mastication. In this study, we could gain the three-dimensional precise structure on primary dentition, the muscle activity balance of masticatory muscles during chewing, the characteristics of head movement during open-close movement of mandible, and the characteristics of mandibular movement in children with primary anterior reverse bite. These parameters were used for making the solid dynamic models to analyze the situation of occlusal contact. Then, computer graphics were used to visually display changing occlusal contact area during lateral excursions in the primary dentition, the occlusal contact area of each tooth was quantified, and occlusal contact occurred at the primary second molars on both the working and non-working sides during lateral excursion.Further studies are needed to evaluate the mandibular movements using computer simulation.

为了探讨口颌功能的发育阶段，我们对正常咬合儿童的下颌运动、咀嚼肌活动、咬合面和咬合力进行了研究。这些结果表明，儿童的口颌功能表现出与成人不同的特征。然而，为了估计成长中儿童咬合功能的生物力学发育、错牙合畸形的功能障碍以及通过治疗从咀嚼功能障碍中恢复的过程，三维下颌运动的视觉估计必须给我们在这个研究方面带来更多的好处。计算机仿真技术广泛用于分析工业领域固体结构的运动。该方法也被认为可用于分析牙齿、下颌牙列和牙齿接触情况，但将该方法应用于牙科领域，必须获得各种准确的参数来制作实体牙列模型，以及咀嚼过程中下颌骨和头部的动态特性。本研究可以获得乳牙列的三维精确结构、咀嚼过程中咀嚼肌的肌肉活动平衡、下颌开闭运动时的头部运动特征以及原发性前牙反咬合儿童的下颌运动特征。这些参数用于建立实体动力学模型来分析咬合接触的情况。然后，利用计算机图形学直观地显示乳牙列横向偏移过程中咬合接触面积的变化，对每颗牙齿的咬合接触面积进行量化，并在横向偏移过程中工作侧和非工作侧的乳生第二磨牙都发生咬合接触。需要进一步研究使用计算机模拟评估下颌运动。