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Effect of heat-treatment atmosphere on the bond strength of apatite layer on Ti substrate

Wang, Xiaojian, Li, Yuncang, Lin, Jianguo, Hodgson, Peter D. and Wen, Cui`e 2008, Effect of heat-treatment atmosphere on the bond strength of apatite layer on Ti substrate, Dental materials, vol. 24, no. 11, pp. 1549-1555, doi: 10.1016/j.dental.2008.03.018.

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Title Effect of heat-treatment atmosphere on the bond strength of apatite layer on Ti substrate
Author(s) Wang, Xiaojian
Li, Yuncang
Lin, Jianguo
Hodgson, Peter D.
Wen, Cui`e
Journal name Dental materials
Volume number 24
Issue number 11
Start page 1549
End page 1555
Total pages 7
Publisher Elsevier Inc
Place of publication Maryland Heights, Mo.
Publication date 2008-11
ISSN 0109-5641
1879-0097
Keyword(s) bioactivity
apatite
bond strength
Simulated body fluid (SBF)
biomimetic process
Summary Objectives
The purpose of this study was to investigate the bond strength of apatite layer on titanium (Ti) substrate coated by biomimetic method and to improve the bonding of apatite layer to Ti substrate by optimizing the alkali heat-treatment process.

Methods
Ti plates pre-treated with an alkali solution of 10 M sodium hydroxide (NaOH) were heat-treated at 600 °C for 1 h at different atmospheres: in air and in vacuum. A dense apatite layer formed on top of the sodium titanate layer after soaking the alkali and heat-treated Ti samples in simulated body fluid (SBF) for up to 3 weeks. The bond strengths of the sodium titanate layer on Ti substrate, and apatite layer on the sodium titanate layer, were measured, respectively, by applying a tensile load. The fracture sites were observed with a scanning electron microscope (SEM).

Results
The apatite layer on the substrate after alkali heat-treatment in air achieved higher bond strength than that on the substrate after alkali heat-treatment in vacuum. It was found that the interfacial structure between the sodium titanate and Ti substrate has a significant influence on the bond strength of the apatite layer.

Significance
It is advised that titanium implants can achieve better osseointegration under load-bearing conditions by depositing an apatite layer in vivo on a Ti surface subjected to alkali and heat-treated in air.
Language eng
DOI 10.1016/j.dental.2008.03.018
Field of Research 090301 Biomaterials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2008, Elsevier Inc.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017289

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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