• Title/Summary/Keyword: Hydorxyapatite

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Study on the Biocompability of Hydroxyapatite Bioceramics(I) Bonding between Hydroxyapatite Bioceramics in Simulated Body Fluid (Hydroxyapatite Bioceramics의 생체 친화성에 관한 연구(I) 인공체액에서의 Hydroxyapatite Bioceramics간의 결합)

  • 고형열;김양수;송종택;최상흘
    • Journal of the Korean Ceramic Society
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    • v.27 no.3
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    • pp.311-320
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    • 1990
  • Hydroxyapatite powders were synthesized with Ca/P=1.67, 1.70 and pH=7, 11 by precipitation method and fluorine substituted hydroxyapatite ceramics were prepared using these powders. After characterization of these hydorxyapatite bioceramics, chemical bonding between these sepcimens in simulated body fluid was investigated. Bysubstitution of 7.5% of fluorine, hydroxyapatite was prevented to decompose into β-tricalcium phosphate and its sintered density and mechanical strength were increased. The bending strength of these hydroxyapatite ceramics was 137MPa. The hydroxyapatite ceramics chemically bonded each other in Ringer's solution and the component of bonded layer was also hydroxyapatite.

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Microstructure of Improved Tooth Surface Using Fine Hydroxyapatite Powder (미세 hydorxyapatite 분말을 이용한 개선된 치아표면의 미세구조)

  • Ryu, Su-Chak;Lim, Byoung-Ki;Kim, Hong-Sung;Park, Young-Min
    • Korean Journal of Materials Research
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    • v.17 no.10
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    • pp.544-547
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    • 2007
  • Human teeth were scratched by the abrasive paper, dropping in hydroxyapatite solution during 1, 2, 3, 4 months. We studied teeth surface change with SEM each months. After 1 months treatment the surface appeared the change. Because of the hydroxyapatite ion exchange mechanism. The scratched surface was recovered by the hydroxyapatite. The results of EDS showed that $Ca^{2+}$ ion and $PO_4^{3-}$ ion were removed from hydroxyapatite solution to scratched teeth surface.

Influence of thermal treatment on the dissolution of hydroxyapatite powders in simulated body fluid (수산화아파타이트 분말의 열처리가 유사생체용액 내 용해거동에 미치는 영향)

  • Song, Dae-Sung;Seo, Dong-Seok;Lee, Jong-Kook
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.15 no.2
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    • pp.79-85
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    • 2005
  • Commercial hydroxyapatite (HA) powders were calcined at the temperature range of $1000{\sim}1350^{\circ}C$ in air, for 2h, and the calcined powders were immersed in simulated body fluid (SBF) of pH 7.4 at $37^{\circ}C$ for 3 or 7 days. Thermal decomposition and their related dissolution behaviors of hydroxyapatite were investigated by XRD, FT-IR, and TEM. At the temperature of $1200^{\circ}C$, HA gradually releases its $OH^-$ ions and transforms to OHAP((oxyhydroxyapatite, ($Ca_{10}(PO_4)_6O_x(OH)_{2-2x}$)). HA thermally decomposes to ${\alpha}-TCP$ (${\alpha}-tricalcium$ phosphate) and TTCP (tetracalcium phosphate) phase at $1350^{\circ}C$. It was found that the surface dissolution of the hydroxyapatite powders was accelerated by non-stoichiometric composition and decomposed to ${\alpha}-TCP$ and TTCP.