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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.116  No.1349 (January) (2008)  >  pp.63-67

Journal of the Ceramic Society of Japan
<<Previous article Vol.116  No.1349 (January) (2008)   pp.63 - 67 Next article>>

Effects of thermal treatment on injectability and basic properties of apatite cement containing spherical tetracalcium phosphate made with plasma melting method

Kunio ISHIKAWA1), Akari TAKEUCHI1), Yumiko SUZUKI1)2) and Kiyoshi KOYANO2)
1) Department of Biomaterials, Faculty of Dental Science, Kyushu University
2) Department of Removable Prosthodontics, Faculty of Dental Science, Kyushu University


  We have previously prepared spherical-shaped tetracalcium phosphate (s-TTCP) with plasma melting method. We found that apatite cement (AC) containing s-TTCP showed excellent injectability from syringe and handling property when compared with AC that contained irregular-shaped TTCP (i-TTCP). However, transformation of AC containing s-TTCP (s-AC) to apatitic mineral was suppressed and thus mechanical strength of set s-AC was low. In the present study, thermal treatment was attempted on s-TTCP to convert heat decomposition products formed in s-TTCP during plasma melting process to TTCP. X-ray diffraction (XRD) analysis revealed that some heat decomposition products in s-TTCP converted to TTCP when s-TTCP was heated at 1,500°C for four hours and quenched at room temperature (q-TTCP). AC containing q-TTCP transformed to apatitic monolith and showed equivalent mechanical strength similar to AC that contained i-TTCP —without sacrificing excellent injectability from syringe and handling property. Based on these findings, we concluded that AC containing q-TTCP would benefit patients since it delivered excellent injectability without sacrificing basic setting properties of AC.



Keyword:
Apatite cement, Calcium phosphate cement, Injectability, Tetracalcium phosphate, Spherical powder

Received: October 10, 2007
Accepted: November 15, 2007 , Published online: January 01, 2008
Copyright (c) 2008 The Ceramic Society of Japan

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