نتایج جستجو برای: zirconium oxide

تعداد نتایج: 180730  

Journal: :Journal of prosthodontics : official journal of the American College of Prosthodontists 2013
Yeon-Jo Choi Michael E Razzoog

PURPOSE The present study compared changes in CIE L*a*b* color coordinates of substrates of different colors when covered with zirconium oxide discs (Procera) and with such discs if veneered with two shades of porcelain. MATERIAL AND METHODS Forty background substrates were fabricated and divided into four groups depending on the color of the substrates: white, black, gray, and tooth-colored ...

Journal: :Scientific reports 2016
Nadiya B Nayak Bibhuti B Nayak

Aqueous sodium borohydride (NaBH4) is well known for its reducing property and well-established for the development of metal nanoparticles through reduction method. In contrary, this research paper discloses the importance of aqueous NaBH4 as a precipitating agent towards development of porous zirconium oxide. The boron species present in aqueous NaBH4 play an active role during gelation as wel...

Journal: :The Journal of bone and joint surgery. British volume 2005
T von Schewelov L Sanzén I Onsten A Carlsson J Besjakov

We investigated the wear characteristics and clinical performance of four different total hip joint articulations in 114 patients. Wear and migration was measured by roentgenstereophotogrammetric analysis at five years or at the last follow-up. The mean annual wear was 0.11 mm for a stainless steel/Enduron articulation, 0.34 mm for stainless steel/Hylamer cup, 0.17 mm for zirconium oxide cerami...

2008

Thanks to the Kroll process, metallic zirconium can be produced by means of a fairly complicated reduction process. In actual fact, the ore is found as a by-product when mining titanium and tin ore. Since 2003, the price of zirconium has more than doubled. This is the result of increasing demand and also the fact that a considerable amount of energy is needed to release zirconium from its chemi...

Journal: :journal of lasers in medical sciences 0
shahin kasraei dental research center, department of restorative dentistry, school of dentistry, hamadan university of medical sciences, hamadan, iran mohammad atefat department of restorative dentistry, school of dentistry, hamadan university of medical sciences, hamadan, iran maryam beheshti private practice, tehran, iran. nassimeh safavi laser application in medical sciences research center, shahid beheshti university of medical sciences, tehran, iran. maryam mojtahedi department of restorative dentistry, school of dentistry, hamadan university of medical sciences, hamadan, iran loghman rezaei-soufi dental research center, department of restorative dentistry, school of dentistry, hamadan university of medical sciences, hamadan, iran.

introduction: since it is not possible to form an adequate micromechanical bond between resin cement and zirconia ceramics using common surface treatment techniques, laser pretreatment has been suggested for zirconia ceramic surfaces. the aim of this study was to evaluate the effect of carbon dioxide (co 2 ) laser treatment on shear bond strength (sbs) of resin cement to zirconia ceramic. metho...

Journal: :journal of ultrafine grained and nanostructured materials 2015
maryam hosseini-zori

nano-encapsulated iron oxide in zirconium oxide-coated mica pigments are thermally stable,innocuous to human health, non-combustible, and they do not conduct electricity. they could beapplied in several industries such as thermoplastics, cosmetics, food packaging, children toys, paints,automobiles coating, security purposes, and banknotes. nowadays, they are highly desirable inceramic decoratio...

Journal: :Folia morphologica 2006
T Bayerlein P Proff G Richter S Dietze J Fanghänel T Gedrange

The favourable mechanical properties and high biocompatibility of the newly developed mixed ceramics composed of zirconium oxide and aluminium oxide have continuously extended the scope of their application. Rotating instruments on a zirconium oxide basis are regarded as superior to metal burs in dentoalveolar surgery in terms of favourable temperature effects on the surrounding bone tissue and...

2004
D. A. Glocker

Zirconium oxide and tantalum oxide films were deposited in an inverted cylindrical magnetron cathode using high power pulsed sputtering. Average power densities were between 5 and 7 W/cm2 and peak power densities were in the range of 0.5 kW/cm2. In all of the experiments the oxygen was introduced using flow control, and the current and voltage waveforms of the HPPMS supply changed in a reproduc...

Azita Salimian Jamshid Najafpour Speideh Ketabi

In this study, doped vanadium oxide nanotubes were evaluated using different software to study the absorption of hydrogen gas. Vanadium oxide nanotubes are one of the options for absorption and storage hydrogen gas. In this research study for the first time, the Monte Carlo simulation was used to investigate the hydrogen gas absorption behavior in molybdenum-tungsten, molybdenum-zirconium and z...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2014
mahshad alaei ali morad rashidi iida bakhtiari

in comparison to the previous researches, zro2 nanoparticles with higher surface area (85 m2/g) have been synthesized in this research. the as-prepared zro2 nanoparticles by co-precipitation method were characterized with x-ray diffraction (xrd), scanning electron microscopy (sem) and transmission electron microscopy (tem). the surface area of the sample was characterized by bet method. the eff...

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