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Journal of Dental Research
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Surface Tension and Contact Angle on Enamel of Surfactant Solutions for Caries Diagnosis with Dyes

J.W. Van de Rijke

University of Groningen, Dental School, Laboratory for Materia Technica, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands

H.J. Busscher

University of Groningen, Dental School, Laboratory for Materia Technica, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands

J.J. Ten Bosch

University of Groningen, Dental School, Laboratory for Materia Technica, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands

J.F. Perdok

University of Groningen, Dental School, Laboratory for Materia Technica, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands

We measured the surface tension of solutions of five surfactants in water, ethanol, and a 50% water/ethanol mixture at 25°C, as well as the contact angle of these solutions on ground and polished bovine enamel in vitro and on intact pellicle-covered human enamel in vivo.

All surfactants lowered the surface tension of water. In ethanol, no reduction of the surface tension was achieved by any of the five surfactants. In the water/ethanol mixture, only Fluorad® lowered the surface tension from 29.2 to 19.7 mJ.m-2 at 25°C.

On bovine dental enamel, all surfactant solutions showed a significantly lower contact angle than did distilled water.

On pellicle-covered human enamel, Rewoteric® in distilled water showed no significantly lower contact angle than did pure distilled water, but all other solutions did.

Both in vitro and in vivo, ethanol spread instantaneously over the enamel surface.

Based on these measurements, we concluded that several surfactants may be used to spread ayueous dye solutions. In a 50% mixture of water and ethanol and in pure ethanol, no surfactant is necessary for enhanced spreading of the solution, but surfactants may be considered for adhesive properties.

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Journal of Dental Research, Vol. 68, No. 7, 1205-1209 (1989)
DOI: 10.1177/00220345890680071201
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J.W. Van de Rijke and J.J. Ten Bosch
Optical Quantification of Caries-like Lesions in vitro by Use of a Fluorescent Dye
Journal of Dental Research, May 1, 1990; 69(5): 1184 - 1187.
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