نتایج جستجو برای: cobalt alloy

تعداد نتایج: 81530  

Journal: :Journal of dental research 1961
K ASGAR F A PEYTON

The casting of cobalt-base alloys in dentistry is comparatively new in relation to the casting of gold alloys and other restorative procedures. It has been less than thirty years since these alloys were introduced to dentistry, but each year they have become more popular. A survey of the choice of dental alloys for removable partial dentures conducted by Lane' in 1949 showed that five times as ...

Journal: :The Journal of bone and joint surgery. British volume 1997
M J Allen B J Myer P J Millett N Rushton

Particulate wear debris can induce the release of bone-resorbing cytokines from cultured macrophages and fibroblasts in vitro, and these mediators are believed to be the cause of the periprosthetic bone resorption which leads to aseptic loosening in vivo. Much less is known about the effects of particulate debris on the growth and metabolism of osteoblastic cells. We exposed two human osteoblas...

2016
Goro Nishigawa Yukinori Maruo Masao Irie Naoto Maeda Kumiko Yoshihara Noriyuki Nagaoka Takuya Matsumoto Shogo Minagi Daniel Rittschof

BACKGROUND Sandblasting particles which remain on the surfaces of dental restorations are removed prior to cementation. It is probable that adhesive strength between luting material and sandblasting particle remnants might exceed that with restorative material. If that being the case, blasting particles adhere to sandblasted material surface could be instrumental to increasing adhesive strength...

Journal: :The American journal of cardiology 2006
Victor Legrand Henning Kelbaek Karl Eugen Hauptmann Dietmar Glogar Wolfgang Rutsch Gilles Grollier Paul Vermeersch Joseph Elias Cornelis Carolus De Cock

The Clinical and Angiographic analysis with a Cobalt Alloy Coronary Stent (Driver) (CLASS) study was a prospective, nonrandomized, multicenter study designed to assess the safety and efficacy of a cobalt-chromium alloy-based stent in patients with stable or unstable angina pectoris. A total of 203 lesions were treated in 202 enrolled patients. The percentage of major adverse cardiac event-free ...

1995
N. S. Wheeler

The present research concerns an electrodeposited cobalt-tungsten alloy coating on graphite fibers. Annealed and unannealed coated fibers were analyzed by scanning electron microscopy/energy dispersive x-ray spectroscopy (SEM/EDS), x-ray diffraction (XRD), and transmission electron microscopy (TEM). The mole fraction of tungsten in the as-deposited cobalt-tungsten coating was found to be (7.10 ...

Journal: :Dental materials journal 2005
Eisei Hayashi Masafumi Kikuchi Osamu Okuno Kohei Kimura

In this study, the grindability of cast magnetic alloys (Fe-Pt-Nb magnetic alloy and magnetic stainless steel) was evaluated and compared with that of conventional dental casting alloys (Ag-Pd-Au alloy, Type 4 gold alloy, and cobalt-chromium alloy). Grindability was evaluated in terms of grinding rate (i.e., volume of metal removed per minute) and grinding ratio (i.e., volume ratio of metal rem...

Journal: :The Journal of bone and joint surgery. British volume 2007
P-A Vendittoli S Mottard A G Roy C Dupont M Lavigne

We evaluated the concentrations of chromium and cobalt ions in blood after metal-on-metal surface replacement arthroplasty using a wrought-forged, high carbon content chromium-cobalt alloy implant in 64 patients. At one year, mean whole blood ion levels were 1.61 microg/L (0.4 to 5.5) for chromium and 0.67 microg/L (0.23 to 2.09) for cobalt. The pre-operative ion levels, component size, female ...

Journal: :The Journal of arthroplasty 2017
Kenneth L Urish Brian R Hamlin Anton Y Plakseychuk Timothy J Levison Genymphas B Higgs Steven M Kurtz Anthony M DiGioia

BACKGROUND Gross trunnion failure (GTF) is a rare complication in total hip arthroplasty (THA) reported across a range of manufacturers. Specific lots of the Stryker low friction ion treatment (LFIT) anatomic cobalt chromium alloy (CoCr) V40 femoral head were recalled in August 2016. In part, the recall was based out of concerns for disassociation of the femoral head from the stem and GTF. ME...

Journal: :Physical chemistry chemical physics : PCCP 2014
Luiz H S Gasparotto André L B Castelhano Anielle C A Silva Noelio O Dantas Osvaldo N Oliveira José R Siqueira

In this paper we demonstrate that layer-by-layer (LbL) films of polyamidoamine (PAMAM) dendrimers and single-walled carbon nanotubes (SWCNTs) are efficient for controlling the morphology of electrogenerated cobalt (Co) and the platinum-cobalt (PtCo) alloy. While Co grew to the micrometer scale and poorly covered the ITO substrate, with the LbL matrix it was kept in the nanoscale regime and prov...

Journal: :The Journal of arthroplasty 2002
Yuki Kishida Nobuhiko Sugano Kenji Ohzono Takashi Sakai Takashi Nishii Hideki Yoshikawa

We performed 204 cementless total hip arthroplasties using a fully porous stem made of a cast cobalt-chrome-molybdenum alloy. Five stems fractured at the middle part. Champagne-fluted canals (P<.0001) and low canal fillings 1 cm below the lesser trochanter (P =.02) significantly correlated with stem fractures. Subsequent surgery revealed that all of the proximal parts were surrounded by fibrous...

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