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Open AccessArticle

A Comparative Study of the Sintering Behavior of Pure and Manganese-Substituted Hydroxyapatite

1
Department of Materials Science and Engineering, University of Connecticut, 97 North Eagleville Rd, Unit 3136, Storrs, CT 06269, USA
2
Department of Aerospace, Mechanical and Mechatronic Engineering, J07 University of Sydney, University of Sydney, Sydney, NSW 2006, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Rafael Luque
Materials 2015, 8(9), 6419-6436; https://doi.org/10.3390/ma8095308
Received: 12 July 2015 / Revised: 25 August 2015 / Accepted: 14 September 2015 / Published: 18 September 2015
(This article belongs to the Section Biomaterials)
Hydroxyapatite (HA) is a widely studied biomaterial for its similar chemical composition to bone and its osteoconductive properties. The crystal structure of HA is flexible, allowing for a wide range of substitutions which can alter bioactivity, biodegradation, and mechanical properties of the substituted apatite. The thermal stability of a substituted apatite is an indication of its biodegradation in vivo. In this study, we investigated the thermal stability and mechanical properties of manganese-substituted hydroxyapatite (MnHA) as it is reported that manganese can enhance cell attachment compared to pure HA. Pure HA and MnHA pellets were sintered over the following temperature ranges: 900 to 1300 °C and 700 to 1300 °C respectively. The sintered pellets were characterized via density measurements, mechanical testing, X-ray diffraction, and field emission electron microscopy. It was found that MnHA was less stable than HA decomposing around 800 °C compared to 1200 °C for HA. The flexural strength of MnHA was weaker than HA due to the decomposition of MnHA at a significantly lower temperature of 800 °C compared to 1100 °C for HA. The low thermal stability of MnHA suggests that a faster in vivo dissolution rate compared to pure HA is expected. View Full-Text
Keywords: hydroxyapatite; ion substitution; sintering behavior hydroxyapatite; ion substitution; sintering behavior
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Zilm, M.; Thomson, S.D.; Wei, M. A Comparative Study of the Sintering Behavior of Pure and Manganese-Substituted Hydroxyapatite. Materials 2015, 8, 6419-6436.

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