Chewing and swallowing activity of masticatory muscles in patients with a complete upper and a partial lower denture.
The chewing and swallowing activity of jaw-closing muscles was studied longitudinally in 30 partially edentulous subjects who were provided with an immediate complete upper and a partial lower denture. Electromyographic recordings of the anterior temporal and masseter muscles were obtained during habitual chewing of apple and during swallowing of saliva and water, before final extractions and 7 weeks, 6 months, 1 year and 2 years after denture insertion. At the pre-treatment stage, when the patients were chewing with a residual anterior dentition, the mean voltages showed low values compared to findings reported in subjects with a complete natural dentition. After 6 months of denture use, the chewing forces showed significant increases in amplitude, and the increased force of contraction persisted to the 2-year stage. The recordings of swallowing revealed no significant changes in maximal mean voltage during the observation period. However, there was a significant increase in the duration of the swallows after 1 year of denture wearing, which might be related to stabilization of the complete upper denture due to continuing resorption of the maxillary ridge.
Tallgren
A
A
Institute of Dental Prosthetics, Royal Dental College, Copenhagen, Denmark.
Tryde
G
G
D000328:Adult; D000368:Aged; D003679:Deglutition / Q000502:physiology*; D003779:Denture Design; D003825:Denture, Complete, Immediate; D003827:Denture, Complete, Upper; D003829:Denture, Partial; D004576:Electromyography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008334:Mandible; D008406:Masseter Muscle / Q000502:physiology*; D008409:Mastication / Q000502:physiology*; D008875:Middle Aged; D012815:Signal Processing, Computer-Assisted; D013703:Temporal Muscle / Q000502:physiology*; D013997:Time Factors