Formation of brushite, monetite and whitlockite during equilibration of human enamel with acid solutions at 37 degrees C

Caries Research
R P ShellisF K Wahab

Abstract

The residues of 5 samples of powdered human enamel, each subjected to 5 sequential equilibrations at 37 degrees C with either 17 or 4 mmol/l phosphoric acid, were examined microscopically. With 17 mmol/l acid, both brushite and monetite were found after 1 equilibration but, after further equilibrations, brushite was no longer present and the abundance of monetite crystals increased. Formation of monetite probably contributed to the lower metastability of this system compared to similar low-pH systems at 25 degrees C, where monetite does not form. Neither brushite nor monetite were present after equilibration with 4 mmol/l acid. Whitlockite was identified by transmission electron microscopy and electron diffraction in all residues. In the 4 mmol/l systems, the ionic activity product (IMWH) for magnesium whitlockite, Ca9Mg(HPO4)(PO4)6, became constant after 1-3 equilibrations, at a mean value of 3.6 (+/-0.51 SE).10(-105), which may reflect saturation with respect to this solid. For the 17 mmol/l systems, higher values of IMWH, and supersaturation with respect to monetite, were interpreted as evidence for persistent metastability due to slow crystal growth of whitlockite and monetite. It is concluded that neither brushite nor mone...Continue Reading

Citations

Sep 1, 1997·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·P Brown
Oct 13, 2004·Journal of Dentistry·M E Barbour, J S Rees
May 24, 2016·Biochimica Et Biophysica Acta·Victoria M Wu, Vuk Uskoković
Sep 29, 2004·Journal of Colloid and Interface Science·R P Shellis, R M Wilson
May 10, 2018·Ultrasonics Sonochemistry·Jutharatana Klinkaewnarong, Songkot Utara
Aug 16, 2017·Crystal Growth & Design·Dongni RenJanet Moradian-Oldak

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