Abstract
Concurrent calcium, phosphate and fluoride depositions, and the rate of hydrogen ion production, during formation on acid etched enamel surfaces were kinetically measured in a closed system. The deposition rate of calcium and phosphate from solution was dependent on the fluoride concentrations and pH. The proportions of calcium to phosphate and calcium to fluoride indicated fluorapatite or fluorhydroxyapatite formation on the enamel. The hydroxyl ion additions to maintain constant pH, concurrent with mineral deposition, exceeded the total phosphate ions deposited from solution. This indicates the possibility that acid phosphate hydrolysis occurs during mineral deposition.
Résumé
Les dépôts simultanés en calcium, phosphate et fluorure et le taux de formation en ion hydrogène, pendant la minéralisation, de surfaces d'émail, attaquées par des acides, sont mesurés du point de vue cinétique dans un système fermé. Le taux de dépôt en calcium et phosphate, à partir de la solution, dépend des concentrations en fluorure et du pH. Les proportions de calcium par rapport au phosphate et de calcium par rapport au fluor suggère la formation de fluoroapatite ou de fluorohydroxyleapatite sur l'émail. L'adjonction d'ions hydroxyles pour maintenir un pH constant au moment du dépôt minéral, dépasse les ions phosphates totaux qui se déposent. Ce fait semble indiquer la possibilité d'une hydrolyse de phosphate acide pendant le dépôt minéral.
Zusammenfassung
In einem geschlossenen System wurden die gleichzeitigen Ablagerungen von Calcium, Phosphat und Fluorid sowie die Geschwindigkeit der Wasserstoffionenproduktion während der Mineralbildung an säureverätzten Zahnschmelz-Oberflächen kinetisch gemessen. Die Ablagerungsgeschwindigkeiten von Calcium und Phosphat aus der Lösung hingen von den Fluoridkonzentrationen und dem pH ab. Das Verhältnis von Calcium zu Phosphat und von Calcium zu Fluorid zeigte die Bildung von Fluorapatit oder Fluorhydroxyapatit auf dem Zahnschmelz an. Die Hydroxylionenzugaben, welche nötig waren, um das pH während der Mineralablagerung konstant zu halten, überschritten die totalen, aus der Lösung ausgeschiedenen Phosphationen. Dies weist auf die Möglichkeit hin, daß während der Mineralablagerung eine saure Phosphat-Hydrolyse stattfindet.
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Feagin, F.F. Calcium, phosphate, and fluoride deposition on enamel surfaces. Calc. Tis Res. 8, 154–164 (1971). https://doi.org/10.1007/BF02010132
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DOI: https://doi.org/10.1007/BF02010132