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Effect of Glass Phase on the Defect Formation during the Dissolution of Hydroxyapatite
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Effect of Glass Phase on the Defect Formation during the Dissolution of Hydroxyapatite

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Abstract:

Particle separations occurred frequently in sintered hydroxyapatite when immersed in distilled water or simulated body fluid. This dissolution initiated at grain boundary creating nano-size defects such as small pores and grew up to micro scale by increasing immersion time. The dissolution, probably due to the appearance of secondary phases in grain boundary, resulted in grain separation at the surfaces and finally in degradation and fracture. And the dissolution concentrated on those grains adjacent to pores rather than those in the dense region. Hydroxyapatite ceramics incorporated with calcium silicate glass were prepared by slip casting to enhance the sinterability as well as to reduce dissolution. Glass phase was incorporated into hydroxyapatite to act as sintering aids followed by crystallization in order to improve the mechanical properties without reducing biocompatibility. From dissolution test, significant damage was reduced even more than 7 days and the dissolution pattern somewhat changed than pure hydroxyapatite. X-ray diffraction and SEM showed no decomposition of secondary phases in grain boundary and fracture toughness somewhat increased.

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Advanced Biomaterials VII View Preview

Info:

Periodical:

Key Engineering Materials (Volumes 342-343)

Pages:

637-640

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.342-343.637

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Online since:

July 2007

Authors:

Sang Heum Youn, Z. X. Yang, Kyu Hong Hwang, Jong Kook Lee, Seog Young Yoon

Keywords:

Calcium Silicate, Degradation, Dissolution, Grain Boundary, Hydroxyapatite (HAP)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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