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Effect of heat treatment on compressive strength and setting behavior of TTCP/DCPA-derived calcium phosphate cement
The present work is attempt to provide a simple heat treatment method that can modify the working/setting time of tetracalcium phosphate/dicalcium phosphate anhydrous (TTCP/DCPA)-derived calciumphosphate cement (CPC) without using additives or sacrificing its strength. The two powders (TTCP and DCPA) were mixed (1:1 in molar ratio) in 1M phosphate hardening solution (H3PO4). One minute after mixing the CPC paste was packed under pressure in a cylindrical stainless steel mold. The working time of the CPC was determined as the duration for which the paste was no longer moldable, while setting time was measured according to ISO 1566 standard method. The working/setting time of the CPC could be significantly changed by heat treatment. In general, when the heat treatment temperature was too low or too high, the working/setting time became longer than that of original, untreated CPC. At longer heat treatment time could prolong or shorten the working/setting time, depending on the temperature. Although exact mechanisms are not fully understood at this time, from a practical point of view, the present heat treatment (160 - 180 deg C for an hour or so) provides a simple method that can significantly reduce the working/setting time of TTCPA/DCPA-derived CPC without the use of any additives and without sacrificing its mechanical strength.
Effect of heat treatment on compressive strength and setting behavior of TTCP/DCPA-derived calcium phosphate cement
The present work is attempt to provide a simple heat treatment method that can modify the working/setting time of tetracalcium phosphate/dicalcium phosphate anhydrous (TTCP/DCPA)-derived calciumphosphate cement (CPC) without using additives or sacrificing its strength. The two powders (TTCP and DCPA) were mixed (1:1 in molar ratio) in 1M phosphate hardening solution (H3PO4). One minute after mixing the CPC paste was packed under pressure in a cylindrical stainless steel mold. The working time of the CPC was determined as the duration for which the paste was no longer moldable, while setting time was measured according to ISO 1566 standard method. The working/setting time of the CPC could be significantly changed by heat treatment. In general, when the heat treatment temperature was too low or too high, the working/setting time became longer than that of original, untreated CPC. At longer heat treatment time could prolong or shorten the working/setting time, depending on the temperature. Although exact mechanisms are not fully understood at this time, from a practical point of view, the present heat treatment (160 - 180 deg C for an hour or so) provides a simple method that can significantly reduce the working/setting time of TTCPA/DCPA-derived CPC without the use of any additives and without sacrificing its mechanical strength.
Effect of heat treatment on compressive strength and setting behavior of TTCP/DCPA-derived calcium phosphate cement
Einfluß der Wärmebehandlung auf die Druckfestigkeit und das Abbindeverhalten des von TTCP/DCPA abgeleiteten Calciumphosphatzements
Chen, W.C. (author) / Ju, C.P. (author) / Chern Lin, J.H. (author)
Journal of Materials Science Letters ; 21 ; 1583-1585
2002
3 Seiten, 7 Bilder, 16 Quellen
Article (Journal)
English
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