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

AUTOR(ES)

Assis, Camila Molena de, Vercik, Luci Cristina de Oliveira, Santos, Márcio Luís dos, Fook, Marcus Vinícius Lia, Guastaldi, Antonio Carlos

FONTE

Materials Research

DATA DE PUBLICAÇÃO

2005-06

RESUMO

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.

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