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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

Guedes, RM (Autor) FEUP; Marina Gomes (Autor) Outra; Simoes, JA (Autor) Outra

Revista

Título: Journal of Biomaterials Science, Polymer Edition

Vol. 17 Nº 10

Páginas: 1173-1189

ISSN: 0920-5063

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 4 Citações

Scopus - 4 Citações

COMPENDEX

INSPEC

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Biotecnologia ambiental

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17