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Journal of Dental Research
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Extensibility Characteristics of Human Cheek-Visco-elastic Properties

T.P. Ho

Orthodontics Department, University of Connecticut Health Center, Farmington, Connecticut 06032

S. Weinstein

Orthodontics Department, University of Connecticut Health Center, Farmington, Connecticut 06032

W.W. Bowley

Mechanical Engineering Department, University of Connecticut, U-139, Storrs, Connecticut 06268

Using a hydraulic bellows system mounted on a maxillary partial denture, continuous force-displacement data were taken in an edentulous area in the maxillary bicuspid-molar region on ten adults. Both loading and unloading force-displacement curves showed three segments. Two visco-elastic properties - hysteresis and relaxation - were consistently evident. The maximum difference in force-magnitude of the hysteresis loop was 1.02 g. A pre-conditioning phenomenon of the cheek tissue, evidenced by a reduction of the area of the hysteresis loop, was observed in a series of repeated runs.

The significance of the study was that: (1) in some individuals, the cheek could be displaced, by expansion of the molars, up to 1 mm into a second stable position; and (2) the relaxation phenomenon suggests a limited adjustive capacity in cheek stiffness.

Journal of Dental Research, Vol. 63, No. 10, 1258-1260 (1984)
DOI: 10.1177/00220345840630101901
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[Abstract] [PDF]