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Journal of Dental Research
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Microbeam X-ray Diffraction Analysis of Dental Calculus

T. Kani

Department of Preventive Dentistry

M. Kani

Department of Preventive Dentistry

Y. Moriwaki

Department of Dental Materials and Technology, Gifu College of Dentistry, Hozumi-cho, Motosu-gun, Gifu 501-02, Japan

Y. Doi

Department of Dental Materials and Technology, Gifu College of Dentistry, Hozumi-cho, Motosu-gun, Gifu 501-02, Japan

The crystalline components of human dental calculus were investigated using microbeam x-ray diffraction analysis. Hydroxyapatite and octacalcium phosphate were most frequently found in that portion having porous and zonal structure. In the portion of the homogeneous illustration showing high calcification, whitlockite is a main component. Brushite was unexpectedly rare, and no calcite was detected in any portion of human dental calculus. The mechanism of the formation of dental calculus being considered in this paper is that octacalcium phosphate or brushite is formed during the initial stage of calcification of dental plaque, and is gradually hydrolyzed and transformed into hydroxyapatite and/or whitlockite.

Journal of Dental Research, Vol. 62, No. 2, 92-95 (1983)
DOI: 10.1177/00220345830620021901
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R.C. Hall, G. Embery, and R.P. Shellis
Fluoride Modulates the Inhibition of in Vitro Hydroxyapatite Crystal Growth by Small Dentin Proteoglycan: Relevance to Dental Calculus
Advances in Dental Research, December 1, 1995; 9(4): 433 - 442.
[Abstract] [PDF]