Abstract
The purpose of this study was to investigate the mechanism of the crystal bonding, which had been suggested as a new surface treatment.
Calcium sulfate dihydrate (gypsum) was precipitated on an enamel surface that was treated with two different aqueous solutions, acrylic acid-ammonium sulfate and citric acid-ammonium sulfate.
The crystal was found to combined with the enamel surface by an adhesion test, X-ray diffraction, scanning electron microscope and X-ray microanalysis.
Based on the misfit of atomic arrangement of gypsum and hydroxyapatite, it was suggested that gypsum was deposited on the enamel surface by epitaxial growth.
