ISSN:
1013-9826
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
In this study modified starch were used as anti-washout promoters of injectable calciumphosphate cement (CPC) and the effects of the modified starch on the injectability, anti-washoutperformance, setting time, compressive strength, phase evolution and microstructure of this cementwere investigated. The injectability of the cement was improved by adding the modified starch(0.5-2.0%). After mixing with modified starch (0.5-2.0%), the cement showed better anti-washoutperformance than that without modified starch after immersed and shaken in SBF. Especially, whenthe content of the modified starch was 1.0%, the remaining percentage of the cement was reached to92.6%, but only 5.9% of the CPC paste remained and set for the sample without modified starch aftershaken for 2 hrs. The compressive strength of cements significantly increased from 44 MPa to 54MPa when 0.5% of modified starch was added. And a slight increase on the mechanical strength canbe observed for other concentrations. Powder X-ray diffraction analysis revealed no significantdifference for the conversion of the cement to hydroxyapatite for any concentrations of modifiedstarches. The influence of the modified starch on the microstructure of the set cement was alsostudied. The results showed the modified starch would reduce the acicular crystal size ofhydroxyapatite accompanied with little flaky crystals generation and made a compact structure. It isconcluded that modified starch, a suitable anti-washout promoter, improved the performance of CPC
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.843.pdf
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