bone cement Articles
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The influence of coating technology on the mechanical performance of montmorillonite nanoclay reinforced acrylic bone cement
One of the primary reasons for joint replacement failure is fracture of the bone cement mantle. The objective of this study was to determine the effects of improving the dispersion of montmorillonite nanoclay in acrylic bone cement (by using coating technology) on the mechanical properties of the cured nanocomposite bone cement. Statistically significant improvements were found in the fracture ...
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Effects of intermittent overloads on fatigue of PMMA bone cement
PMMA bone cements are widely used in orthopaedics, but questions remain as to their long term durability. Although fatigue of bone cements has been widely studied, the effects of variable amplitude loading are not fully understood. This paper presents a novel method using a crossover experimental design, in which a crack is propagated under ΔK control and a series of different overload patterns ...
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Incorporation of montmorillonite nanoclay to acrylic bone cement: effect on mechanical properties and morphology
The principal mode of loosening of joint replacements is bone cement mantle failure, which is made worse with formation of microcracks under mechanical load. In this in vitro study the effect of incorporating montmorillonite nanoclay on the mechanical properties and morphology of bone cement was investigated. This study was conducted using a Design of Experiments (DOE) approach, which facilitated ...
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Influence of a novel radiopacifier (nano-sized strontia particles) on in vitro properties of a PMMA bone cement for use in total joint replacements
In literature reports on strontia-containing PMMA bone cements, the strontia was combined with another material, micron-sized particles were used and in vitro fatigue data are sparse. The present report is on the in vitro characterisation of a strontia-containing PMMA bone cement in which nano-sized strontia particles that were not combined with any other material were used (NANOSRO cement). ...
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Bone cement: an overview
Polymethylmethacrylate bone cement is a widely utilised material in the field of orthopaedic surgery and specifically total joint arthroplasty. Despite this, its mechanical properties are poorly understood by the end-user and there is controversy over the manner in which the material should be tested and the effects some commonly used techniques have on its mechanical properties. This article ...
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The effect of mixing technique on fatigue of bone cement when stress concentrations are present
Mixing techniques used to reduce porosity in bone cement demonstrate large improvements in fatigue behaviour in test specimens, but do not appear to reduce the rate of loosening of implants in vivo. We examined data showing the effect of notches on fatigue strength and found, surprisingly, that notches with low stress-concentration factors (Kt Keywords: mixing technique, fatigue strength, bone ...
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An autonomically-healed PMMA bone cement: influence of the crystal size of Grubbs' catalyst on fracture toughness and polymerisation rate
In this study, it was shown that the concept of autonomic healing of a neat polymeric material, which was introduced by White et al. (2001) could be applied to poly methyl methacrylate (PMMA) bone cement. The bone cement brand used – Surgical Simplex®P – is one that is widely used in cemented arthroplasties; the healing agent used was 2.0 wt.% dicyclopentadiene (DCPD), encapsulated in poly ...
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Investigations on drop penetration and wetting characteristics of powder-liquid systems in relation to the mixing of acrylic bone cement
This study investigated methyl methacrylate – polymethyl methacrylate powder bed interactions through droplet analyses, using model fluids and commercially available bone cement. The effects of storage temperature of liquid monomer and powder packing configuration on drop penetration time were investigated. Methyl methacrylate showed much more rapid imbibition than caprolactone due to decrease in ...
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Part 1: In-vitro release of gentamicinpalmitate coating in uncemented titanium implants
Microporous surfaces of commercially available uncemented Tilastan® implants were coated with gentamicinpalmitate. The roughness of the titanium implant surfaces remained largely intact. During the first few days, the gentamicin release was comparable to the elution of this antibiotic from commercially available PMMA bone cements. Compared to PMMA cements, the implants coated with the ...
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What drives one doctor-turned-engineer to keep innovating
In surgery as well as engineering, Greg Roger understands why precision matters in innovation. Dr Greg Roger aspired to be a surgeon, also ended up an engineer, and was probably a born inventor. Nowadays, as well as being all of the above, he helps others to perfect and commercialise their medical technology ideas. Greg was recently interview by Create, here’s their intro. For the full ...
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Field Orthopaedics gets FDA approval for world’s smallest orthopaedic screw
The Brisbane-based designer of the world’s smallest orthopaedic screw has invoiced US hospital suppliers $900,000 in the three weeks since the device gained Food & Drug Administration approval, and he hopes it can soon be made in Brisbane too. Field Orthopaedics, founded in 2016 by former Army doctor Chris Jeffery alongside a team of doctors and engineers including hand surgeon Greg ...
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Medical Device Regulation - Indian Perspective
The Indian Medical Devices industry is mostly import-dependent with no specific regulations in place till recent times. With the introduction of MDR (Medical Device Rules 2017) attempt has been made to harmonize the Indian medical device Industry as per globally prevailed ...
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