Comparison of crystallinity between natural hydroxyapatite and synthetic cp-Ti /HA coatings

• Autor(a) principal: Assis,Camila Molena de
• Data de Publicação: 2005
• Outros Autores: Vercik,Luci Cristina de Oliveira, Santos,Márcio Luís dos, Fook,Marcus Vinícius Lia, Guastaldi,Antonio Carlos
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Materials research (São Carlos. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000200022
• topic: biomaterials; titanium; biomimetic process; hydroxyapatite

Commercial purity titanium (cp-Ti), and some of its alloys are important materials in the medical field because of their excellent biocompatibility and mechanical properties. Recently a simple chemical method to induce bioactivity in these inert metallic materials was reported. In this work, the biomimetic chemical process has been used to modify the surface of cp-Ti with the formation of a deposit layer of apatite (a calcium phosphate compound). The main purpose was to study the influence of heat treatment on changes in crystallinity in the deposited phases. X-ray diffraction analysis and scanning electron microscopy showed that the apatite coatings heat treated between 400 and 600 °C were less crystalline, similar to biological apatites. Upon heat treatment at temperatures above 700 °C, the apatite coatings appeared more crystalline, and were a mixture of hydroxyapatite, octacalcium phosphate and magnesium phosphate.