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Proceedings Paper

Contouring Of Tooth Imprints By Means Of A Fluorescence Technique Adapted To A Spatially Filtered Moire Illumination
Author(s): Frans H. M. Jongsma; Paul Lambrechts; Guido Vanherle
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Paper Abstract

A technique has been developed to produce plane equidistant contouring surfaces on tooth-imprints. This technique consists of spatially filtering a negative obtained by photographing the imprint under a Moire illumination. Unfortunately this technique turned out to be very sensitive for a non-uniform surface reflectivity. To obtain an object-brightness depending only upon the contouring mechanism, the imprint has been coated with a fluorescent dye. A HeCd-laser (λ=422 nm) served as a lightsource for the projection of the Moire-interference pattern on the imprint. The radiation of the fluorescent coating (λ=530 nm) is used to form an image on the negative. In this way the surface with specular reflection properties is transformed into a Labertian surface. The spatial filtering technique allows multiple exposures of the final negative enabling an increased depth of field. Contour mappings with a resolution in depth of less than 10 μm have been obtained.

Paper Details

Date Published: 12 July 1983
PDF: 5 pages
Proc. SPIE 0361, Biostereometrics '82, (12 July 1983); doi: 10.1117/12.966001
Show Author Affiliations
Frans H. M. Jongsma, University of Limburg (The Netherlands)
Paul Lambrechts, Catholic University Leuven (Belgium)
Guido Vanherle, Catholic University Leuven (Belgium)

Published in SPIE Proceedings Vol. 0361:
Biostereometrics '82
Robin E. Herron, Editor(s)

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