Abstract
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 contributionof sensory inputs from denture supporting mucosa to regulate the masticatory movementwas examined electromyographycally. In experimental dentures, a metal half hemisphere (0.5 mmdiam.) was attached on the premolar region of the mucosal surface of the habitual chewing sideof either upper or lower denture as mechanical stimulation (innoxious). Surface EMGs of bilateralmasseter (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 andmaximum opening distance showed different reactions between soft and tough foods wearingexperimental denture and marked difference in lower experimental denture.2. Integrated potential of the EMG increased wearing experimental denture and the grindingmotion exaggerated because of an increased integrated potential of balancing side Tp in lowerexperimental denture.3. CV values of EMG time paramreters and integrated potential increased wearing experimentaldenture and markedly increased in lower experimental denture.From these results, it was suggested that the mechanoreceptors in the denture supportingmucosa might play an important role in the control of sensory feedback on masticatory function ofthe complete denture wearers.
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