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Formation of calcium phosphates on titanium implants with four different bioactive surface preparations. An in vitro study

Journal article
Authors Anna Arvidsson
Victoria Franke Stenport
Martin Andersson
Per Kjellin
Young-Taeg Sul
Ann Wennerberg
Published in Journal of Materials Science-Materials in Medicine
Volume 18
Issue 10
Pages 1945-1954
ISSN 0957-4530
Publication year 2007
Published at Institute of Clinical Sciences
Pages 1945-1954
Language en
Links dx.doi.org/10.1007/s10856-007-3097-...
Keywords RABBIT CORTICAL BONE, SIMULATED BODY-FLUID, EARLY TISSUE-RESPONSE, APATITE FORMATION, CHEMICAL TREATMENT, INTERFACE INVITRO, CRYSTAL-STRUCTURE, TREATED TITANIUM, OXIDE THICKNESS, PURE TITANIUM
Subject categories Chemical Engineering, Biomaterials

Abstract

The aim of the present study was to compare the nucleating and growing behaviour on four types of bioactive surfaces by using the simulated body fluid (SBF) model. Titanium discs were blasted and then prepared by alkali and heat treatment, anodic oxidation, fluoridation, or hydroxyapatite coating. The discs were immersed in SBF for 1, 2, 4 and 6 weeks. Calcium phosphates were found on all specimens, as analysed with scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX). After 1 and 2 weeks of SBF immersion more titanium was accessible with SEM/EDX on the blasted surfaces than the four bioactive surface types, indicating a difference in coverage by calcium phosphates. The Ca/P mean ratio of the surfaces was approximately 1.5 after 1 week, in contrast to the fluoridated specimens which displayed a Ca/P mean ratio of approximately 2. Powder X-ray diffraction (P-XRD) analyses showed the presence of hydroxyapatite on all types of surfaces after 4 and 6 weeks of immersion. The samples immersed for 6 weeks showed a higher degree of crystallinity than the samples immersed for 4 weeks. In conclusion, differences appeared at the early SBF immersion times of 1 and 2 weeks between controls and bioactive surface types, as well as between different bioactive surface types.

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