Journal of Prosthetic Dentistry
Volume 63, Issue 5 , Pages 506-512, May 1990

Three-dimensional photoelastic stress analysis of the ferrule effect in cast post and cores

  • R.W. Loney, D.M.D., M.S.

      Affiliations

    • Corresponding Author InformationReprint requests to:Dr. Robert W. Loney College of Dentistry University of Saskatchewan, Saskatoon S7N 0W0 Canada.
    • University of Saskatchewan, College of Dentistry, Saskatoon, Saskatchewan, Canada
    • The University of Michigan, School of Dentistry, Ann Arbor, Mich., USA
    • Assistant Professor, Department of Restorative and Prosthetic Dentistry, University of Saskatchewan, College of Dentistry.
    • ,
  • W.E. Kotowicz, D.D.S., M.S.

      Affiliations

    • University of Saskatchewan, College of Dentistry, Saskatoon, Saskatchewan, Canada
    • The University of Michigan, School of Dentistry, Ann Arbor, Mich., USA
    • Professor, Prosthodontics Department, and Acting Dean, The University of Michigan, School of Dentistry.
    • ,
  • G.C. McDowell, D.D.S., M.S.

      Affiliations

    • University of Saskatchewan, College of Dentistry, Saskatoon, Saskatchewan, Canada
    • The University of Michigan, School of Dentistry, Ann Arbor, Mich., USA
    • Assistant Professor, Prosthodontics Department, The University of Michigan, School of Dentistry.

Abstract 

The effect of a metal collar on stress distribution with cast post and cores was studied by using three-dimensional photoelastic models of maxillary canine teeth of average dimensions. Standardized parallel post and cores were cemented into the models, with half of the samples incorporating a 1.5 mm metal collar. A 400 gm load was applied to the cingulum of the cores and stresses were frozen in the models. The posts were removed, the teeth were sectioned, and stresses were measured with a circular polariscope. In both groups the greatest stress concentration was found at the lingual apex of the post. On a point by point basis, stresses were higher in the collared specimens. Variation in stress magnitude among five preselected points was greater within the noncollared group.

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 Based on a thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Prosthodontics, Horace H. Rackham School of Graduate Studies, The University of Michigan, Ann Arbor, Mich.

 Financial support for this investigation was provided by the Government of Saskatchewan and the Canadian Fund for Dental Education.

PII: 0022-3913(90)90066-L

Journal of Prosthetic Dentistry
Volume 63, Issue 5 , Pages 506-512, May 1990

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