Strontium can be deposited in bone apatite either by the replacement of surface adsorbed calcium, or by substitution for intracrystalline calcium (1-3). It has also been reported that both of these processes favor the deposition of calcium to that of strontium (3). This report is concerned with the comparative incorporation of calcium and strontium in synthetic apatites. We shall present eviden...

Atomic force microscopy, infrared spectroscopy and NMR studied morphological and physicochemical properties of calcium hydroxyapatite powders produced by changing the temperature parameters of synthesis. Features of morphology formation of calcium hydroxyapatite nanoparticles with an annealing temperature within 200°C to 1,100°C were determined. It is shown that the particle size of the apatite...

Dissolution rate studies were conducted with hydroxyapatite and enamel in the presence of adsorbed surfactants. In general, the ability of the surfactant to retard the dissolution rate was directly related to its ability to adsorb onto apatite. Cetylpyridinium chloride adsorbed poorly onto apatite, and its influence on the dissolution rate was marginal. The long-chain protonated amines were muc...

Escherichia coli K-12, grown in a synthetic medium containing metastable calcium phosphate, formed intracellular biological apatite crystals.

Etched tracks of apatite and zircon are both widely used for the determination of the thermal history of Earth’s crust. The present understanding of the annealing process is largely limited to mathematical fits to data for etched track-lengths as a function of temperature and time. Details of the annealing of unetched, latent tracks at the atomic scale have remained elusive, as the original tra...

Introduction: There is currently significant interest in all-ceramic dental restorations. A potential non-metallic material for such restorations is an apatite-mullite glass-ceramic that could be processed to shape using different processing techniques. The aim of this study was to assess and evaluate the ability of an apatite-mullite glass-ceramic material to be processed using three routes: l...

X-rays of the shoulder, hand, and knee joints from 30 patients with pyrophosphate arthropathy (PA) and 30 age and sex matched control subjects were examined for periarticular, dense, homogeneous calcifications considered to be apatite deposits. They were found in 30% of the patients with PA compared with 3.3% of the controls. In addition in the PA group the incidence of Heberden's nodes was sig...

This paper will report on research which aims to generate bone replacement components by processing bioactive glass-ceramic powders using indirect selective laser sintering. The indirect SLS route has been chosen as it offers the ability to tailor the shape of the implant to the implantation site, and two bioactive glass ceramic materials have been processed through this route: apatite-mullite ...

The crystal of hydroxyapatite, Ca10 (PO4) 6 (OH) 2 has a characteristic that it varies easily depending on the acidic base environment around the enamel. The etymology of apatite is said to come from the Greek word meaning “to deceive” since it contains various elements in the Ca, PO4, and OH areas and changes appearance. In other words, the true character behind the demineralization and remine...

Sodium titanate formed on Ti metal by NaOH and heat treatments induces apatite formation on its surface in a body environment and bonds to living bone. These treatments have been applied to porous Ti metal in artificial hip joints, and have been used clinically in Japan since 2007. Calcium titanate formed on Ti-15Zr-4Nb-4Ta alloy by NaOH, CaCl2, heat, and water treatments induces apatite format...