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Table of Contents
Vol. 45, No. 1, 2011
Issue release date: April 2011
Caries Res 2011;45:13–20
(DOI:10.1159/000322300)

Inhibition of Dental Erosion by Casein and Casein-Derived Proteins

White A.J. · Gracia L.H. · Barbour M.E.
aSchool of Oral and Dental Sciences, University of Bristol, Bristol, and bGlaxoSmithKline Consumer Healthcare R&D, Weybridge, UK

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Abstract

The application of milk-derived proteins such as casein as anti-erosion agents in oral healthcare products is of current interest. The aim of this study was to investigate the potential of 3 commercially available, milk-derived proteins as agents to inhibit enamel erosion. Aqueous solutions of 0.5% w/v casein, casein phosphopeptide (CPP) or glycomacropeptide (GMP) with and without 300 ppm fluoride (F, as NaF) were investigated with regard to enamel softening and tissue loss, in comparison with a deionised water (DIW) negative control and 300 ppm F positive control. Casein and F reduced enamel surface softening compared to DIW, but CPP and GMP did not (DIW: 58.2% reduction in hardness; F: 13.3%; casein: 21.8%; CPP: 50.8%; GMP: 62.4%). Similar results were obtained with solutions containing protein and F, and the effects were statistically indistinguishable from protein alone (casein + F: 19.1%; CPP + F: 48.2%; GMP + F: 66.1%). By contrast, all protein solutions and F significantly reduced tissue loss (p < 0.050; DIW: 25.8 µm tissue loss; F: 21.6 µm; casein: 20.3 µm; CPP: 20.5 µm; GMP: 20.0 µm). Solutions containing protein and F reduced erosion more than protein alone, but this difference was only significant from protein alone for casein (casein + F: 12.2 µm; CPP + F: 17.3 µm; GMP + F: 18.2 µm). Casein and casein-derived proteins may therefore have the potential to act as agents to reduce or prevent enamel erosion. Furthermore, the erosion-reducing efficacy is not reduced by F, and is in some cases enhanced.



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