Thermoluminescence in silicon substituted apatite and silicon stabilized tricalcium phosphate bioceramic
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Silicon stabilized tricalcium phosphate (Si-TCP), with a crystal structure similar to α-TCP (Ca3(PO4)2) is formed when a stoichiometric calcium hydroxyapatite (HA or Ca5(PO4)3OH) precipitate is sintered in the presence of added silica (SiO2) at temperatures between 850 and 1,000 °C [1, 2, 3]. A change in the lattice constants with silicon content of both the P21/a Si-TCP and the P63/m HA crystallographic unit cell suggests that Si is incorporated into both of these phases . In the absence of silicon, an α-TCP phase is expected to be present only after sintering at temperatures greater than 1,200 °C . Unlike undoped counterparts, Si-TCP based materials prepared by adding SiO2 to HA are resorbable by osteoclast cells and exhibit good osteoconductive properties . As Si is implicated in the biological performance of these materials, it is of the utmost importance to determine the changes induced by Si in this calcium phosphate system.
IR and NMR measurements indicate a significant...
KeywordsElectron Spin Resonance Recombination Center Glow Curve Calcium Hydroxyapatite Electron Spin Resonance Investigation
Funding from the Natural Sciences and Engineering Research Council and Millenium Biologix Inc through a Collaborative Research and Development Grant within the Research Partnerships Program is acknowledged. Thanks are due to Dr. J.R.Schreiner of the Kingston Regional Cancer Clinic for use of the thermoluminescent dosimeter reader.
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