顎関節症を伴う不正こう合患者の側面顎顔面形態とこう合力の関連に関する研究

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  • Study on the relationship between lateral facial morphology andbite force in orthodontic patients with temporomandibular disorder.

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The relationship between bite force and craniofacial morphology has been studied with various methods in subjects free of temporomadibular disorder (TMD) signs and symptoms; however, whether these variables have any relation in TMD patients remains unclear. The aim of this study was to determine the relation between lateral facial morphology and bite force in TMD symptomatic and asymptomatic orthodontic patients. Experimental data were obtained from 42 orthodontic female patients (TMD free group: 23 patients; TMD group: 19 patients) using the Occlusal Prescale system. The following results were obtained:<BR>The mean total bite force was 768.8±525.8N in the TMD free group and 438.1±380.1N in the TMD group. The mean occlusal contact area was 12.9±11.9mm2 in the TMD free group and 6.4±2.8mm2 in the TMD group. The mean average occlusal pressure was 59.8±13.4kg/mm2 in the TMD free group, and 69.9±9.0kg/mm2 in the TMD group. The distribution of bite force, occlusal contact area and average occlusal pressure increased anteroposteriorly. Bite force, occlusal contact area and average occlusal pressure in the molar area of the TMD group were significantly lower than that of the TMD free group. Bite force, occlusal contact area and average occlusal pressure were significantly different between the TMD free and the TMD groups.<BR>Total bite force and contact area of the TMD free group showed a negative correlation to mandibular plane angle, gonial angle and a positive correlation to L1 to mandibular plane angle. Molar bite force and contact area in the TMD free group showed a negative correlation to mandibular plane angle, gonial angle, occlusal plane to FH and positive correlation to Ll to mandibular plane angle and UL-SN. Premolar bite force and contact area in the TMD free group also correlated negatively to mandibular plane angle and gonial angle. However, there was no correlation between lateral cephalometric and occlusal parameters and in TMD group. These results suggest that bite force relates to lateral craniofacial morphology in orthodontic patients with TMD free patient but not with TMD populations.

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