Surface roughness measurements of dental fillings by optical methods

Michel Bouchard; Michel Doucet; Gilbert V. April

doi:10.1117/12.60207

1 August 1992 Surface roughness measurements of dental fillings by optical methods

Michel Bouchard, Michel Doucet, Gilbert V. April

Proceedings Volume 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II; (1992) https://doi.org/10.1117/12.60207
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

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.

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Michel Bouchard, Michel Doucet, and Gilbert V. April "Surface roughness measurements of dental fillings by optical methods", Proc. SPIE 1647, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine II, (1 August 1992); https://doi.org/10.1117/12.60207

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KEYWORDS

Surface roughness

Specular reflections

Surface finishing

Composite resins

Polishing

Scattering

Diffraction

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