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Journal of Dental Research, Vol 69, 1664-1668, Copyright © 1990 by International & American Associations for Dental Research Online Journals
ARTICLES |
Y. Yuasa, Y. Sato, S. Ohkawa, T. Nagasawa and H. Tsuru
Department of Removable Prosthodontics, Hiroshima University School of Dentistry, Japan.
A parameter study with use of the finite element method was conducted for examination of the relationships between the shape parameters of a clasp (width and thickness at the base and tip of the clasp) and its displacement or stress. By synthesis of these relationships, a simple formula defining the clasp tip displacement in terms of clasp dimensions ("displacement formula") was obtained. A stiffness parameter "Fd" (the load producing a 1-mm displacement of the clasp tip) was proposed, and a formula defining Fd in terms of shape parameters was derived from the displacement formula. Fd would be a practical parameter for the definition of clasp retention, and the present formulae appear to be useful tools for investigation of the retention of removable partial dentures.
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