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Proceedings Paper

Surface roughness measurements of dental fillings by optical methods
Author(s): Michel Bouchard; Michel Doucet; Gilbert V. April
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Paper Abstract

The large amount of new materials like amalgams and techniques of finishing and polishing in operative dentistry has stimulated interest for simple non-destructive methods of surface roughness evaluation. We studied an optical method based on the scattering of coherent light upon reflection on prepared samples of composite resins submitted to different surface treatments. The method should be able to discriminate the degree of flatness for the samples thus enabling a classification procedure according to a figure of merit to be defined. The diffraction properties of such moderately rough surfaces has been correlated with mechanical profilometric measurements of the residual granular structure after polishing. Different surface treatments of composite resins result in distinctive levels of surface flatness, and it is shown that a relation between the intensity of the normalized specular reflection of a beam of coherent light and the rms surface roughness can be established for characterization purposes.

Paper Details

Date Published: 1 August 1992
PDF: 11 pages
Proc. SPIE 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II, (1 August 1992); doi: 10.1117/12.60207
Show Author Affiliations
Michel Bouchard, Univ. Laval (Canada)
Michel Doucet, Univ. Laval (Canada)
Gilbert V. April, Univ. Laval (Canada)


Published in SPIE Proceedings Vol. 1647:
Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II
Halina Podbielska, Editor(s)

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