Extensibility Characteristics of Human Cheek-Visco-elastic Properties

Abstract

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.

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References

Crisp, J.D.C. (1972): Properties of Tendon and Skin. In: Biomechanics : Its Foundation and Objectives, Fung, Y.C. , Perrone, N. , and Anliker, M. , Eds., Englewood, N.J.: Prentice-Hall, Inc., pp. 141-179.

Fung, Y.C. (1972): Stress-Strain History Relations of Soft Tissues in Simple Elongation. In: Biomechanics: Its Foundation and Objectives, Fung, Y.C. , Perrone, N. , and Anliker, M. , Eds., Englewood Cliffs, N.J.: Prentice-Hall, Inc., pp. 181-208.

Fung, Y.C. (1981): The Stress-Strain Relationship. In: Biomechanics : Mechanical Properties of Living Tissues, Springer-Verlag, pp. 210-212.

Ho, T.P. ; Azar, K. ; Weinstein, S. ; and Bowley, W.W. (1982): Physical Properties of Human Lips: Experimental and Theoretical Analysis, J Biomech 15:859-866.

Lear, C.S.C. ; Macray, J.S. ; and Lowe, A. (1972): Threshold Levels of Displacement of Human Teeth in Response to Laterally Directed Forces, J Dent Res 51:1478-1482.

MARKS STANDARD HANDBOOK FOR MECHANICAL ENGINEERING, 8th ed. (1979), T. Baumeister , Ed.

Muller, E.M. and Macleod, G.E. : Perioral Biomechanics and Its Relation to Labial Motor Control (personal communication) . Weinstein, S. (1967): Minimum Forces in Tooth Movement, Am J Orthod 53:881-903, 1967.

Weinstein, S. ; Ho, T.P. ; Bowley, W.W. ; and Boyle, M. (1983): Extensibility Characteristics of the Human Cheek: A Pilot Study, J Dent Res 62:344-348.

Weinstein, S. ; Haack, D.C. ; Morris, L.Y. ; Snyder, B.B. ; and Attaway, H.E. (1963): On an Equilibrium Theory of Tooth Position, Angle Orthod 33:1-26.