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Optical Engineering

Holographic evaluation of the marginal fits of complete crowns loaded at the central fossa
Author(s): Terry Y. Chen; Guan Liang Chang; Shih Hwang Wu
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Paper 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.

Paper Details

Date Published: 1 May 1995
PDF: 5 pages
Opt. Eng. 34(5) doi: 10.1117/12.199877
Published in: Optical Engineering Volume 34, Issue 5
Show Author Affiliations
Terry Y. Chen, National Cheng Kung Univ. (Taiwan)
Guan Liang Chang, National Cheng Kung Univ. (Taiwan)
Shih Hwang Wu, National Cheng Kung Univ. (Taiwan)

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