Development of Display System of Individual Mandibular Movement Based on the CT Data

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The purpose of this research is to grasp quantitative mandibular movement of a patient and find out useful information in the movement for diagnosis and medical treatment of masticatory diseases. It usually requires operative invasion to examine mandibular conditions around condyles, which gives a lot of physical burden to the patient. This study developed a new system to present three-dimensional movement of the human mandible in intact states. The basic principle of the display system is to draw the patient's mandibular model according to the data of mandibular movement. The mandibular and maxillary models were made by an automated modeling method of FEM using the patient's X-ray CT data. The only surface data of the models were used for drawing the images. We successfully developed the three-dimensional display system which presents animated images of three-dimensional mandibular movement from an arbitrary direction on a personal computer. To improve the display performance, OpenGL was applied. This study also examined a valid indicator which clearly showed masticatory diseases. Velocity profiles of the mandibular movement at both sides of condyles (mandibular heads) were computed using several persons' data. The velocity profiles clearly showed the states of mandibular diseases.