A RHEOLOGICAL, THERMAL AND MECHANICAL STUDY OF BONE-CEMENT - FROM A SUSPENSION TO A SOLID BIOMATERIAL

Citation
A. Nzihou et al., A RHEOLOGICAL, THERMAL AND MECHANICAL STUDY OF BONE-CEMENT - FROM A SUSPENSION TO A SOLID BIOMATERIAL, Powder technology, 99(1), 1998, pp. 60-69
Citations number
37
Categorie Soggetti
Engineering, Chemical
Journal title
ISSN journal
00325910
Volume
99
Issue
1
Year of publication
1998
Pages
60 - 69
Database
ISI
SICI code
0032-5910(1998)99:1<60:ARTAMS>2.0.ZU;2-T
Abstract
Surgical bone cements are mainly based on acrylic (co)polymers, poly(m ethyl methacrylate) (PMMA) being the most representative. The curing p rocess is the result of free radical polymerization of a suspension of PMMA powder and methyl methacrylate. The fundamental characteristic o f the suspensions before polymerization is the viscosity. Therefore, i n this paper, the rheological study of a suspension evolving to hard c ement by polymerization is discussed. The effect of concentration (vol ume fraction) of solids, temperature and nature of inorganic compounds used as filler and opaque substances to X-ray radiations on the visco sity of the suspension are examined. Experimental data and models are discussed. The rheological behaviour corresponds to a shear-thickening model typical for concentrated suspension and data fit to a modified Chong equation. Bone cements obtained by polymerization of the suspens ion were characterized by differential scanning calorimetry to determi ne the heat released during the polymerization, the degree of reaction and the glass transition temperature. Mechanical properties are also reported and compared with results for existing commercial sources for bone cement. (C) 1998 Elsevier Science S.A. All rights reserved.