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Journal of Dental Research
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Carbonate Apatites from Aqueous and Non-aqueous Media Studied by ESR, IR, and X-ray Diffraction: Effect of NH4+ Ions on Crystallographic Parameters

Y. Doi

Department of Dental Technology, Osaka University Dental School, Nakanoshima, Kita-ku, Osaka 530, Japan

Y. Moriwaki

Department of Dental Technology, Gifu College of Dentistry, Takano 1851, Hozumi-cho, Gifu 501-02, Japan

T. Aoba

Department of Oral Pathology, Osaka University Dental School, Nakanoshima, Kita-ku, Osaka 530, Japan

M. Okazaki

Department of Dental Technology, Kagoshima University Dental School, Usuki-cho, Kagoshima 890, Japan

J. Takahashi

Department of Dental Technology, Kagoshima University Dental School, Usuki-cho, Kagoshima 890, Japan

K. Joshin

Department of Dental Technology, Kagoshima University Dental School, Usuki-cho, Kagoshima 890, Japan

Carbonate-containing apatites prepared from aqueous and non-aqueous media were investigated by ESR, IR, and X-ray diffraction. A typical asymmetric signal at g=2.0, which many workers have observed in irradiated calcified tissues, is interpreted in terms of CO3-3 and CO-2 and the trapped electron center. The CO3-3 and CO- 2 ions originated from the carbonate which substitutes for the phosphate ion in the apatite crystalline structure.

From the comparison of the data between the carbonate apatites prepared under the presence of Na + and NH4+ ions, it is suggested that NH 4+ ions contribute to the crystallographic parameters, either by substituting in the structure or by suppressing the CO3 incorporation into the structure, or by both. The production of the C02 radical ion could be accounted for based on the concept of hydrogen bond between the oxygen atom of CO2-3 and the hydrogen atom of NH4 +.

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Journal of Dental Research, Vol. 61, No. 2, 429-434 (1982)
DOI: 10.1177/00220345820610021301
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This Article
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What's this?