ethylene oxide/väsimus

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Fatigue strength of polyethylene after sterilization by gamma irradiation or ethylene oxide.

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The oxidation level of ultrahigh molecular weight polyethylene specimens sterilized by gamma irradiation in either air or Ar gas was compared with that of unsterilized and ethylene oxide sterilized ultrahigh molecular weight polyethylene. The fatigue strength of ultrahigh molecular weight

Dependence of in vitro fatigue properties of PMMA bone cement on the polydispersity index of its powder.

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Four variants of poly (methyl methacrylate) (PMMA) bone cement were used, the difference being in the method used to sterilize the powder (three different dosages of gamma irradiation and ethylene oxide gas) and, hence, in the molecular weight of the powder. For each cement powder, the

Fatigue of Self-Healing Nanofiber-based Composites: Static Test and Subcritical Crack Propagation.

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Here, we studied the self-healing of composite materials filled with epoxy-containing nanofibers. An initial incision in the middle of a composite sample stretched in a static fatigue test can result in either crack propagation or healing. In this study, crack evolution was observed in real time. A

Fracture and fatigue properties of acrylic bone cement: the effects of mixing method, sterilization treatment, and molecular weight.

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The purpose of this study was to characterize the relative and combined effects of sterilization, molecular weight, and mixing method on the fracture and fatigue performance of acrylic bone cement. Palacos R brand bone cement powder was sterilized using ethylene oxide gas (EtO) or gamma irradiation.

[A survey of ethylene oxide sterilization in a hospital].

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The health and environmental problems of ethylene oxide gas sterilization in a hospital are reported. Eight nurses who had been engaged in the gas sterilization, sometimes operated the auto-sterilizer in an inadequate manner; they exposed more than several hundred ppm of ethylene oxide once or twice

Detection of cracks in polyethylene components of retrieved knee joint prostheses.

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Subsurface cracks that had formed in polyethylene artificial knee components were observed nondestructively with a new method, scanning acoustic tomography (SAT). Standardization of the SAT observation was done by in-vitro rolling fatigue testing on an unimplanted ultra high molecular weight

Effect of sterilization method on properties of Palacos R acrylic bone cement.

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The focus of this work was a delineation of the effect of the method of sterilization (gamma-irradiation versus exposure to ethylene oxide (EtO) gas) of the powder constituents of Palacos R bone cement on the molecular weight, quasi-static tensile and compressive properties and fatigue performance

Sterilization of elastic ligatures for intraoperative mandibulomaxillary immobilization.

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Sterilization can influence the mechanical properties of elastic ligatures used for mandibulomaxillary immobilization. The aim of this study was to compare different sterilization protocols (ethylene oxide, autoclave, irradiation, plasma sterilization, povidone-iodine for 24 hours and 70% isopropyl

The impact of sterilization method on wear in knee arthroplasty.

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Sterilization by gamma irradiation in air has been shown to have the potential to accelerate the oxidation of polyethylene components resulting in reduced mechanical properties. In the hip, it has been reported that the occurrence of delamination and cracking in retrieved bearings is significantly

One-stage lengthening of femoral nonunion augmented with human bone morphogenetic protein.

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Fifteen patients with posttraumatic shortened atrophic femoral nonunions were treated with one-stage lengthening. The alloimplant was composed of allogeneic antigen extracted autolyzed human bone perfused with partially purified human cortical bone morphogenetic protein associated with

[Current knowledge on the effect of technology and sterilization on the structure, properties and longevity of UHMWPE in total joint replacement].

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Ultrahigh molecular weight polyethylene (UHMWPE) is the most frequently used bearing surface in currently used total joint replacements (TJR). According to the literature available, UHMWPE is the best polymer material, in terms of biocompatibility, mechanical properties and wear resistance, for this

Minimum five-year wear rate of metal-on-highly cross-linked polyethylene in primary total hip arthroplasty.

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OBJECTIVE Highly cross-linked polyethylenes (PE) have been developed with encouraging results in terms of wear. Another body of the literature has indicated potential catastrophic failures related to reduced fatigue properties and oxidation. Each PE available on the market has its own processing

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