DMTA analysis for long-term mechanical behaviour prediction of PMMA-based bone cements

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Guedes, RM (Author) FEUP; Marina Gomes (Author) Other; Simoes, JA (Author) Other

Journal

Title: Journal of Biomaterials Science, Polymer Edition

Vol. 17 No. 10

Pages: 1173-1189

ISSN: 0920-5063

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

COMPENDEX

INSPEC

Scientific classification

FOS: Engineering and technology > Environmental biotechnology

Other information

Authenticus ID: P-004-Q2E

DOI: 10.1163/156856206778530678

Abstract (EN): Poly(methyl methaerylate) (PMMA) is commonly used as acrylic bone cement to fix bone implants. In vivo degradation of bone cement may lead to a decrease in mechanical properties and result in aseptic loosening. Creeping can promote failure of the implant. This study used dynamic mechanical thermal analysis (DMTA) equipment, in the 0.01 to 50 Hz frequency range, to investigate the dynamic viscoelastic relaxation characteristics of CMW (TM), PROFIT QUIRURGICO and PALACOS PMMA-based bone cements. Their initial moduli were measured as 2450, 1850 and 1710 MPa, respectively. Relaxation master curves displayed similar features. The DMTA temperature range was between 20 and 75 degrees C. Predictions for long-term relaxation moduli were analyzed and compared against published experimental data. The comparison revealed that master curves obtain using the time-temperature-superposition principle (TTSP) present a much slower relaxation modulus compared to long-term experimental data above 1000 s. However, extrapolations based on a time-power law applied to isothermal experimental data allow better long-term predictions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 17