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

Author(s)

Camila Molena de Assis ^[1] ; Luci Cristina de Oliveira Vercik ^[2] ; Márcio Luís dos Santos ^[3] ; Marcus Vinícius Lia Fook ^[4] ; Antonio Carlos Guastaldi ^[5]

Affiliation

^[1] Unesp. Instituto de Química. Grupo de Biomateriais - Brasil

^[2] Unesp. Instituto de Química. Grupo de Biomateriais - Brasil

^[3] Unesp. Instituto de Química. Grupo de Biomateriais - Brasil

^[4] Unesp. Instituto de Química. Grupo de Biomateriais - Brasil

^[5] Unesp. Instituto de Química. Grupo de Biomateriais - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 8, n. 2, p. 207-211, 2005-06-00.

Abstract

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. (AU)