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Wavelength-independent Microradiography: A Method for Non-destructive Quantification of Enamel and Dentin Mineral Concentrations using Polychromatic X-rays
F.M. Herkströter
Materia Technica, State University Groningen, Ant. Deusinglaan 1, 9713 AV Groningen, The Netherlands
J.J. Ten Bosch
Materia Technica, State University Groningen, Ant. Deusinglaan 1, 9713 AV Groningen, The Netherlands
Wavelength-independent Microradiography (WIM), described in this paper, used polychromatic, high-energy ( 60 kV) x-rays for determination of mineral concentrations in tooth material non-destructively. This was done with the aid of a reference step-wedge made of 94% aluminum, 6% zinc. The mass attenuation coefficient of this material has a wavelength-independent ratio to the mass attenuation coefficients of enamel and dentin. With this method, mineral concentrations of enamel and dentin samples, with a thickness up to 500 µm, were determined at 20- and at 60-kV tube voltage. The samples were demineralized for 72 and 144 h and measured again. Comparison of the data showed that mineral quantification was within 1.5%, independent of the x-rays used. Finally, these mineral concentrations-obtained from the Wavelength-independent Microradiography-were compared with measurements of the same samples by Longitudinal Microradiography. A correlation of 0.99 was found for enamel and one of 0.96 for dentin.
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Journal of Dental Research, Vol. 69, No. 8,
1522-1526 (1990)
DOI: 10.1177/00220345900690081501
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