作者： T. VaCkOVá , J. Dybal , D. POkORný , P. Fulín
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摘要: I. ortopedicka klinika 1. LF UK a Fn Motol, Praha 2 Ustav makromolekularni chemie Av CR, abSTRaCT PURPOSE OF THE STUDY Each method of sterilisation has some effect on the structure and properties UHMWPE thus also joint replace- ment longevity. This study was designed to compare, using objective methods measurement, several kinds sterilisa- tion recommend one which best prospect for making replacements last longer. MATERIAL AnD METHODS Two groups samples were tested. Group 1 included virgin GUR 1020 polyethylene, non-modified non- sterilised (Meditech, Germany). comprised three sets with formaldehyde, gamma irradia- ethylene oxide, respectively. In both groups, physicochemical assessed by infrared spectroscopy (IR), oxidation (OI) trans-vinyl (vI) indices, show degree material, determined. Free-radical concentrations measured electron spin resonance (ESR). The mechanical each sample studied small punch tests (SPT) testing microhardness (MH). Any change in can affect, various degrees, quality longevity prosthetic joint. RESULTS irradiation showed higher values OI (0.37) vI index (0.038) than other (OI, 0.02 0.05 vI, 0). Also, free-radical concentration detectable only gamma- sample. obtained as follows: peak load range 58.48 n (gamma ir- radiation) 59.60 (ethylene oxide); ultimate 46.69 irradiation) 57.50 displacement 4.29 mm 4.58 (virgin polyethylene formaldehyde); work failure 185.18 mJ 205.89 polyethylene). Microhardness following ranges: 41.2 44.6 MPa polyethylene); 40.2 44.1 (formaldehyde); 46.1 49.3 irradiation); 40.3 44.2 oxide). DISCUSSIOn formaldehyde oxide have very similar polyeth- ylene, they are not damaged do contain free radicals. Owing these characteristics, immediate long-term stability is higher. presence radicals oxidative degradation. results deterioration mechani- cal growth crystallinity due enhanced leads microhardness.