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Surface chemistry of enamel apatite during maturation in relation to pH: implications for protein removal and crystal growth.

Abstract：

:Apatite crystal growth rate and morphology in mineralized tissues are considered to be controlled by surface interaction with extracellular matrix proteins. During enamel maturation where protein is finally removed from crystal surfaces to permit massive crystal growth, pH oscillates between approximately 5.8 and approximately 7.2. With this in mind, a study of enamel apatite surface chemistry in terms of local environmental pH was undertaken. Using atomic force microscopy adhesion force measurements were made between hydroxylated or carboxylated cantilever tips and maturation stage crystals between pH 2 and 10. Adhesion force increased from pH 10 to a maximum at pH 6.6 presumably due to increased hydrogen bonding due to replacement of surface cations (Na, Ca, Mg) with protons and/or protonation of phosphate per se. Below pH 6.6 adhesion force decreased and became very variable indicating that the surface had become unstable probably due to removal of fully protonated phosphate from the surface by adherence to the cantilever tip. Frictional force measurements also revealed 2-3, approximately 30 nm diameter high friction domains in bands across the crystal long axis. Their location mirrored the binding pattern of similarly sized amelogenin aggregates seen in vitro. The data suggests that specific protein binding sites may exist on crystal surfaces and may be released at lower pH by protonation which would lower cationic charge on both crystal surface and ionic charge on the protein. Instability of the crystal surface could also play a role.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Robinson C,Connell S,Brookes SJ,Kirkham J,Shore RC,Smith DA

doi

10.1016/j.archoralbio.2004.11.017

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

267-70

issue

2

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(04)00285-7

journal_volume

50

pub_type

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