title: Influence of the modification of P/L ratio on a new formulation of acrylic bone cement.
abstract: The use of smaller powder/liquid (P/L) ratio favours the handling and wetting of poly(methyl methacrylate) (PMMA) beads in bone cement formulations. In this paper a P/L ratio of 1.86 is tested to overcome adhesion problems found in hydroxypropyl methacrylate (HPMA) modified bone cements and the influence on bone cement characteristics was analysed. The reduction of the P/L ratio leads to higher temperature peaks and shorter setting times, whereas the residual monomer content increases slightly. Water uptake obeys the diffusion laws, and the introduction of a more hydrophilic monomer gives rise to an increase of this parameter, which does not present significant changes with modification of the P/L ratio. Polymerization shrinkage is slightly greater because of the introduction of higher proportions of monomer in the formulation. Mechanical properties are similar to those obtained with conventional P/L ratios. The analysis of scanning electron microscopy (SEM) reveals an improvement of the adhesion between phases with respect to P/L = 2 formulations.
authors: Dpto. Ciencia y Tecnología de Polímeros, Facultad de Química, UPV/EHU, San Sebastián, Spain.
authors: B
authors: B
authors: Pascual
authors: M
authors: M
authors: Gurruchaga
authors: M P
authors: MP
authors: Ginebra
authors: F J
authors: FJ
authors: Gil
authors: J A
authors: JA
authors: Planell
authors: I
authors: I
authors: Goñi
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000327:Adsorption; D001843:Bone Cements / Q000737:chemistry; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate; D011208:Powders; D013314:Stress, Mechanical; D013718:Tensile Strength; D014867:Water
chemical_list: D000180:Acrylic Resins; D001843:Bone Cements; D008689:Methacrylates; D011208:Powders; D014867:Water; D019904:Polymethyl Methacrylate; C032802:hydroxypropyl methacrylate