, Volume 18, Issue 1, pp 65-79

HPO 4 2− Content in enamel and artificial carious lesions

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The HPO 4 2− and CO 3 2− content was determined in sound enamel and in material collected from artificially produced carious lesions. The method described shows that the HPO 4 2− content can be determined from the 875 cm−1 infrared absorption band if correction for the CO 3 2− contribution are made. The I. R. spectra show that the HPO 4 2− content in sound human or bovine enamel is about 5% by weight. In artificially produced carious lesions (pH=4.0), the HPO 4 2− content is in the order of 15 wt%. Most likely, the HPO 4 2− ions in sound and carious enamel have a different environment.