Improvement of the stability of hydroxyapatite through glass ceramic reinforcement.
Hydroxyapatite has achieved significant application in orthopedic and dental implants due to its excellent biocompatibility. Sintered hydroxyapatites showed significant dissolution, however, after their immersion in water or simulated body fluid (SBF). This grain boundary dissolution, even in pure hydroxyapatites, resulted in grain separation at the surfaces, and finally, in fracture. In this study, hydroxyapatite ceramics containing apatite-wollastonite (AW) or calcium silicate (SG) glass ceramics as additives were prepared to prevent the dissolution. AW and SG glass ceramics were added at 0-7 wt% and powder-compacted uniaxially followed by firing at moisture conditions. The glass phase was incorporated into the hydroxyapatite to act as a sintering aid, followed by crystallization, to improve the mechanical properties without reducing the biocompatibility. As seen in the results of the dissolution test, a significant amount of damage was reduced even after more than 14 days. TEM and SEM showed no decomposition of HA to the secondary phase, and the fracture toughness increased, becoming even higher than that of the commercial hydroxyapatite.
Ha
Na Ra
NR
Engineering Res. Institute, i-Cube Center, Gyeongsang Nat'l University, Jinju 660-701, S. Korea.
Yang
Zheng Xun
ZX
Hwang
Kyu Hong
KH
Kim
Tae Suk
TS
Lee
Jong Kook
JK
D040761:Biomimetic Materials / Q000737:chemistry; D001826:Body Fluids / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D004355:Drug Stability; D017886:Durapatite / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*
D017886:Durapatite