A Descriptive Study - In Vitro: New Validated Method for Checking HAp and FAp Behaviours

Authors

Ala Eldin Choukaife - Loai  Aljerf

Abstract

Background: Owing to the topical fluoride treatment, calcium fluoride and fluorapatite (FAp) are forming on a dental enamel surface. Many in oral biology, prevention and treatment have studied hydroxyapatite (HAp) and FAp dissolution. Some focused on precipitation reactions since these materials are prerequisites in dental hard tissues. Nonetheless, FAp is less soluble phase amongst calcium phosphates and has more complicated equilibria. Objective: This study aims to validate a suitable method for checking HAp and FAp behaviours. Design: A titration with pH adjustment method using diode laser-scattering system had been performed to monitor any solid increment addition where the material has been reprecipitated and detected by the endpoint represented by the output signal. Materials and Methods: The composition and the morphology of the precipitate were studied and the Ca/P ratio was also determined. A comparative study of the solubility of the CaF2, HAp, and FAp were performed among wax-coated apparatus and
an uncoated container experiment. Results: These showed that Ca/P ratio of the precipitate has decreased steadily at lowering pH values. In addition, FAp has shown slightly less solubility than HAp at pH < 3.9 and the particles were single crystal with rod-like morphology at pH 4.1 and  polycrystalline at pH < 3.6. Conclusions: The titration was successfully validated where wax-coated method had avoided any interference with F--containing test solutions.

Keywords

biocorrosion, complicated equilibria, particles, phase, topical fluoride

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