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Journal of Dental Research
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*Compound via MeSH
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*CALCIUM COMPOUNDS
*CALCIUM, ELEMENTAL
*CARBON
*CARBON BLACK
*NITROGEN
*PHOSPHORUS
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X-ray Photoelectron Spectroscopic Studies of the Adsorption of Salivary Constituents on Enamel

Y. Kubokit

Department of Biochemistry, School of Dentistry, Hokkaido University, Kita-Ku, Sapporo, Japan 060

K. Teraoka

Department of Preventive Dentistry, Tokyo Medical and Dental University, Yushima, Bunkyo-Ku, Tokyo, Japan 113

S. Okada

Department of Preventive Dentistry, Tokyo Medical and Dental University, Yushima, Bunkyo-Ku, Tokyo, Japan 113

Time-dependent change of adsorption of salivary components on the outermost surface layer of enamel was studied by x-ray photoelectron spectroscopy. Adsorption of proteinaceous components, as monitored in terms of the relative mass of nitrogen, was detected within 30 min, increased with time, and reached a plateau at 90 min, Thus, the ratio of nitrogen to calcium in the two-hour sample increased to about 240 times that in the control sample. The ratio of carbon to nitrogen on the surface decreased to about one-half of that in the control sample. The data established the time required for equilibrium between the proteinaceous component in saliva and the amount of material adsorbed onto the tooth surface.

Journal of Dental Research, Vol. 66, No. 5, 1016-1019 (1987)
DOI: 10.1177/00220345870660050401
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