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Journal of Dental Research
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A Comparison of the Influence of Lanthanum and Fluoride on De- and Remineralization of Bovine Enamel in vitro

K. Collys

Vrije Universiteit Brussel, Faculteit Geneeskunde en Farmacie, PRTA, Laarbeeklaan 103, B-1090 Brussels, Belgium

D. Slop

Vrije Universiteit Brussel, Faculteit Geneeskunde en Farmacie, PRTA, Laarbeeklaan 103, B-1090 Brussels, Belgium

L. De Langhe

Vrije Universiteit Brussel, Faculteit Geneeskunde en Farmacie, PRTA, Laarbeeklaan 103, B-1090 Brussels, Belgium

D. Coomans

Vrije Universiteit Brussel, Faculteit Geneeskunde en Farmacie, PRTA, Laarbeeklaan 103, B-1090 Brussels, Belgium

The influence of fluoride and lanthanum on enamel softening was compared by hardness measurements and by determination of the calcium content in the solution. The addition of lanthanum to an acetate buffer solution (0.05 mollL, pH=5.0) had no significant influence on the change of the indentation length and on the calcium release, compared with those of the control group. In the fluoride group, a moderate increase of the indentation length and a reduced calcium loss were observed. In a second experiment, surface-softened bovine enamel was treated with calcifying solutions (Ca/P ratio = 1. 67). Differences in treatment were created by the addition of traces (2 ppm) of lanthanum, fluoride, or both. The acid resistance of the treated enamel was evaluated by two successive softening steps (0.1 mol/L acetate buffer, pH = 5.5). Alterations of the enamel surface were longitudinally followed with a hardness tester. The addition of fluoride, lanthanum, or both significantly improved the rehardening of surface-softened enamel, compared with that of the control group. A 2 x 2 factorial analysis of variance showed that lanthanum and fluoride had a highly significant main effect and a significant negative interaction effect on the rehardening of surface-softened enamel. Subsequent acid treatments revealed that only samples treated with a fluoride-containing solution were adequately protected from further dissolution. The enamel surfaces treated with a solution containing both lanthanum and fluoride were covered with an acid-resistant surface coating. SEM observation of this surface layer revealed the presence of globular and spherulite structures.

Journal of Dental Research, Vol. 69, No. 2, 458-462 (1990)
DOI: 10.1177/00220345900690020801
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D.J. White
The Application of in Vitro Models to Research on Demineralization and Remineralization of the Teeth
Advances in Dental Research, November 1, 1995; 9(3): 175 - 193.
[Abstract] [PDF]