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12 resultados
Fatigue and fracture toughness of acrylic bone cements modified with long-chain amine activators.
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The composition of acrylic bone cement has been identified as one of the important parameters affecting its mechanical properties and may, in turn, ultimately influence the longevity of a cemented arthroplasty. Our aim in this study was to determine the influence of change of one compositional
Improvement of fatigue properties of poly(methyl methacrylate) bone cement by means of plasma surface treatment of fillers.
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The fatigue properties of poly(methyl methacrylate) (PMMA) bone cement were significantly improved through 13.56-MHz radio frequency plasma treatments on the X-ray opaque powder and on the reinforcing fibers. For the plasma treatments of particle surfaces, a specially designed plasma reactor was
Effect of initiation chemistry on the fracture toughness, fatigue strength, and residual monomer content of a novel high-viscosity, two-solution acrylic bone cement.
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Porous-free, two-solution bone cements have been developed in our laboratory as an alternative to commercial powder/liquid formulations. Each pair of solutions consist of poly(methyl methacrylate) (PMMA) powder dissolved in methyl methacrylate (MMA) monomer, with benzoyl peroxide (BPO) added to one
Loss of osteocyte integrity in association with microdamage and bone remodeling after fatigue in vivo.
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As a result of fatigue, bone sustains microdamage, which is then repaired by bone-remodeling processes. How osteoclastic activity is targeted at the removal of microdamaged regions of bone matrix is unknown. In the current studies, we tested the hypothesis that changes in osteocyte integrity,
Sleep deprivation does not affect neuronal susceptibility to mild traumatic brain injury in the rat.
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Mild and moderate traumatic brain injuries (TBIs) (and concussion) occur frequently as a result of falls, automobile accidents, and sporting activities, and are a major cause of acute and chronic disability. Fatigue and excessive sleepiness are associated with increased risk of accidents, but it is
Constancy of masseter muscle structure and function with age in F344 rats.
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Senile muscle atrophy is a characteristic feature of advancing age. Despite the growing body of knowledge about weight-bearing muscles in rodents and man, there is relatively little such information on the muscles of mastication. Therefore, the primary goal here was to develop a masseter muscle
Telangiectasia Macularis Eruptiva Perstans: Report of Three Cases.
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Telangiectasia macularis eruptiva perstans (TMEP) is a rare, heterogeneous disease of mast cell proliferation. The variable clinical presentation of TMEP, coupled with its rarity, makes the recognition and diagnosis of this disease difficult and challenging for clinicians. The histopathologic
Influence of strontia on various properties of surgical simplex P acrylic bone cement and experimental variants.
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The fact that the composition of acrylic bone cement, as used in cemented primary arthroplasties, is not optimal has been highlighted in the literature. For example: (i) deleterious effects of the radiopacifier (BaSO(4) or ZrO(2) particles in the powder) have been reported; (ii) there is an
[Acute myelomonocytic leukemia with mastocytosis in bone marrow].
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A 22-year-old female was admitted to our hospital because of general fatigue. The lymph nodes, liver and spleen were not palpable. She was without cutaneous lesions. Haematological examinations revealed leukocytes 3,200/microliters with 44% blasts of myelomonocytic origin, and platelets
Influence of two changes in the composition of an acrylic bone cement on its handling, thermal, physical, and mechanical properties.
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This study is a contribution to the growing body of work on the influence of changes in the composition of an acrylic bone cement on various properties of the curing and cured material. The focus is on one commercially-available acrylic bone cement brand, Surgical Simplex P, and three variants of it
Innovations in acrylic bone cement and application equipment.
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A new bone cement was developed with the purpose of reducing the adverse biological effects during cementation of implants. This bone cement is characterized by lower exotherm, low release of monomer, low residual content of monomer, and retained physical properties. The essential innovation was
Fiber-type susceptibility to eccentric contraction-induced damage of hindlimb-unloaded rat AL muscles.
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Slow oxidative (SO) fibers of the adductor longus (AL) were predominantly damaged during voluntary reloading of hindlimb unloaded (HU) rats and appeared explainable by preferential SO fiber recruitment. The present study assessed damage after eliminating the variable of voluntary recruitment by
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