| Effects of Particle Size Distribution of CaHPO4·2H2O on Self-hardening Bone Cement |
| In-Soo Hwang, Sang-Hwan Cho, Jong-Kyu Lee |
| Ceramics-building Materials Department, Korea Institute of Ceramic Engineering and Technology (KICET) |
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| ABSTRACT |
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This research examined the effect, which it follows in particle size distribution change of CaHPO$_4$ㆍ2$H_{2}O$ (DCPD). We used two kinds of compositions; tetracalcium phosphate (TTCP)/dicalcium phosphate dihydrate (DCPD) composition and $alpha$-tricalcium phosphate ($alpha$-TCP)TTCP/DCPD composition. As the result, the mean particle size of the DCPD decreased, the setting tine shortened at all compositions. The reference powder (DR), which did not milling, showed about 2 times strength value compared with other milling sample. Especially, the compressive strength of 60 : 20 : 20 sample (DR(do$_{0.5}$)=12.08 $mutextrm{m}$) after curing 7 days in simulated body fluid solution was 40$pm$0.5 MPa, which was the highest. This resulted from the packing density at $alpha$-TCP/TTCP/DCPD combination.
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| Key words:
Self-hardening, TCP, DCPD, Particle size distribution, Setting time |
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