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The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

November/December 2002
Volume 15 , Issue 6

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Modulation of Mastication During Experimental Loosening of Complete Dentures

Frauke Mller, Priv-Doz Dr Med Dent, M. Robin Heath, BDS, PhD, FDS, RCS, Anthony M. Ferman, Graham R. Davis, BSc, PhD

Pages: 553-558
PMID: 12475161

Purpose: Suction is achieved when complete dentures are first fitted, but it fades during the months following insertion, when it is increasingly complemented by muscular denture control. The aim of this study was therefore to investigate the extent to which patterns of mastication are altered by experimental failure of physical retention. Materials and Methods: Seven edentulous volunteers had maxillary replica dentures made, with fine tubes incorporated so that alternating positive and negative air pressure could be generated under the fitting surface. Mandibular movements, EMG, and pressure under the denture base were recorded during unilateral chewing. Results: The change of physical retention passed undetected by all subjects; they continued chewing apparently undisturbed. However, during air injection, the mandibular excursions were slightly slower (nonsignificant) and demonstrated a reduced variance (P .05). The muscle activity showed significantly longer bursts (P .05), and peak activity occurred later in the cycle (nonsignificant). Conclusion: Sudden failure of denture retention seems to initiate an immediate and effective modulation of centrally generated muscular activity patterns.

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