✦ LIBER ✦

Molecular and mechanical property changes during aging of bone cementin vitro andin vivo

✍ Scribed by Looney, M. A. ;Park, J. B.

Publisher: John Wiley and Sons
Year: 1986
Tongue: English
Weight: 842 KB
Volume: 20
Category: Article
ISSN: 0021-9304
DOI: 10.1002/jbm.820200503

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✦ Synopsis

The changes in mechanical properties and free radical concentration of curing Simplex P Radiopaque Bone Cement in vivo and in vitro conditions were studied. Samples were prepared so that each in vivo sample that cured and aged in the canine femoral intramedullary cavities had an in vitro counterpart that was cured and aged in a constant-temperature saline bath at 37 degrees C. An electron paramagnetic resonance (EPR) spectrometer was used to measure the growth and decay (curing) of polymerization radicals. The results of EPR measurements showed that the curing (disappearance of free radicals) of in vivo samples takes a much longer time (more than 4 weeks) than in vitro curing (less than 2 weeks). The mechanical tests indicate that, whether aged in vivo or in vitro, the strength increased rapidly for the first 1-2 weeks and then slight increases were seen for up to 6 months.

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