Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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DCPD Formation and Conversion to HAp in Glass and Glass-ceramic Bone Cement

유리 및 결정화 유리 골 시멘트에서 DCPD의 형성 및 수산화 아파타이트로의 전환

  • Lim, Hyung-Bong (Department of Materials Science and Engineering, Inha University) ;
  • Kim, Cheol-Young (Department of Materials Science and Engineering, Inha University)
  • 임형봉 (인하대학교 신소재공학부) ;
  • 김철영 (인하대학교 신소재공학부)
  • Received : 2010.10.01
  • Accepted : 2010.11.02
  • Published : 2011.01.31
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Abstract

The glass in the system of CaO-$SiO_2-P_2O_5$ and the corresponding glass-ceramics are prepared for bone cements and the behaviors of the hardening and hydroxyapatite formation were studied for the glass and glass-ceramic powders. The glass crystallized into apatite, $\alpha$-wollastonite and $\beta$-wollastonite depending on the glass composition when they were heat-treated at $950^{\circ}C$ for 4 h. A DCPD (dicalcium phosphate dihydrate : $CaHPO_4{\cdot}2H_2O$) was developed when the prepared glass and glass-ceramic powders were mixed with 3M-$H_3PO_4$ solution. The DCPD (Ca/P=1.0) transformed to HAp (Ca/P=1.67) when the bone cement was soaked in simulated body fluid (SBF), and this HAp formation strongly depended on the releasing capacity of $Ca^{2+}$ ions from the glass and glass-ceramic cements. The glass-ceramic bone cement containing $\alpha$-wollastonite crystals showed faster transformation of DCPD to HAp than other glass-ceramics containing $\alpha$- and $\beta$-wollastonite crystals. No hydroxyapatite was observed when the glass-ceramic bone cement containing apatite crystals (36P6C) was soaked in SBF even for 1 month, because no $Ca^{2+}$ ion can be released from the stable apatite crystals.

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References

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