総義歯装着者の咀嚼機能に関する臨床的研究 : 床下粘膜の触・圧感覚の違いが咀嚼筋活動に及ぼす影響
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概要
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The mechanisms of controling mastication in complete denture wearers who have lost the natural tooth proprioception are poorly defined as yet. In the present study, the contribution of sensory inputs from denture supporting mucosa to regulate the masticatory movement was examined electromyographycally. In experimental dentures, a metal half hemisphere (0.5 mm diam.) was attached on the premolar region of the mucosal surface of the habitual chewing side of either upper or lower denture as mechanical stimttlation (innoxious). Surface EMGs of bilateral masseter (Mm) and posterior temporal (Tp) muscles were recorded simultaneously with Sirognathograph (SGG) during mastication of two types of test foods on the habitual side. The data was statistically computed by means of analysis of variance.The results were as follows : 1. In EMG burst duration after occlusal contact, in SGG occluding phase time ratio and maximum opening distance slaowed different reactions between soft and tough foods wearing experimental denture and marked difference in lower experin'nental denture. 2. Integrated potential of the EMG increased wearing experimental denture and the grinding motion exaggerated because of an increased integrated potential of balancing side Tp in lower experimental denture. 3. CV values of EMG time paramreters and integrated potential increased wearing expertmental denture and markedly increased in lower experimental denture. From these results, it was suggested that the mechanoreceptors in the denture supporting mucosa might play an important role in the control of sensory feedback on masticatory function ofthe complete denture wearers.
- 日本補綴歯科学会の論文
- 1991-04-01
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