Holographic evaluation of the marginal fits of complete crowns loaded  at the central fossa

Terry Y. Chen; Guan Liang Chang; Shih Hwang Wu

doi:10.1117/12.199877

1 May 1995 Holographic evaluation of the marginal fits of complete crowns loaded at the central fossa

Terry Y. Chen, Guan Liang Chang, Shih Hwang Wu

Author Affiliations +

Optical Engineering, Vol. 34, Issue 5, (May 1995). https://doi.org/10.1117/12.199877

Abstract

In dentistry, a defect of cementation on the margins of crowns accumulates bacterial plaque easily. This can result in recurrent caries and periodontal disease. In this paper holographic interferometry was applied to evaluate the effect of masticatory force on various complete crowns. Four complete molar crowns made from different materials (Au alloy, Pd-Ag alloy, Ni-Cr alloy, and porcelain fused to metal) were tested. The out-of-plane displacements of the crown specimens were measured by the method of multiple observations. The displacements measured range from 6 to 10 pm under normal load (25 N). However, the marginal openings of all four crowns were estimated to be less than 0.2 μm. In addition the defect of the crown was examined.

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Terry Y. Chen, Guan Liang Chang, and Shih Hwang Wu "Holographic evaluation of the marginal fits of complete crowns loaded at the central fossa," Optical Engineering 34(5), (1 May 1995). https://doi.org/10.1117/12.199877

Published: 1 May 1995

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