Showing 1-30 of 118 resultados for "

gf14423633

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Jasna Dolenc Koce et al.
Environmental toxicology and chemistry, 33(4), 858-867 (2014-05-10)
The effect of ultraviolet-A irradiated or nonirradiated suspensions of agglomerates of titanium dioxide (TiO(2)) or silicon dioxide (SiO(2)) nanoparticles on roots of the onion (Allium cepa) has been studied. The reactive potential of TiO(2) nanoparticles, which have photocatalytic potential, and...
Luigi De Nardo et al.
The International journal of artificial organs, 35(9), 629-641 (2012-10-16)
The natural oxide layer on implantable alloys insulates the reactive underlying metal from the physiological environment, preventing substrate corrosion and device failure. This type of oxide film has had a major role in the minimization of functional failure and toxic...
HaeYong Kweon et al.
Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons, 72(10), 1928-1936 (2014-09-23)
The objective of this study was to compare bone formation after installation of uncoated (UC), hydroxyapatite-coated (HA), collagen plus HA-coated (CH), and silk plus HA-coated (SH) implants. Implants in the UC group had acid-etched surfaces. Surface coating was applied using...
J Rashid et al.
Environmental technology, 35(17-20), 2153-2159 (2014-08-26)
InVO4/TiO2 composite was synthesized via amalgamation of InVO4 with TiO2 (Degussa P-25) powders. Application of the produced composite was evaluated as a catalyst for visible-light photocatalytic degradation of 2-chlorophenol (2-CP) in synthetic wastewater solutions. The catalyst was characterized by X-ray...
Hongbo Shi et al.
Particle and fibre toxicology, 10, 15-15 (2013-04-17)
Titanium dioxide (TiO2) nanoparticles (NPs) are manufactured worldwide in large quantities for use in a wide range of applications. TiO2 NPs possess different physicochemical properties compared to their fine particle (FP) analogs, which might alter their bioactivity. Most of the...
Maria Menini et al.
The International journal of prosthodontics, 28(1), 37-39 (2015-01-15)
This in vitro study evaluated the adhesive strength of a technique to lute implant cylinders to metal frameworks in implant-supported prostheses and ensure a good passive fit. Different height samples were tested: In group 1, implant cylinders were 5 mm...
G Janer et al.
Toxicology letters, 228(2), 103-110 (2014-05-06)
Large efforts are invested on the development of in vitro tests to evaluate nanomaterial (NM) toxicity. In order to assess the relevance of the adverse effects identified in in vitro toxicity tests a thorough understanding of the biokinetics of NMs...
Zahed Mohammadi et al.
The New York state dental journal, 80(3), 39-43 (2014-06-18)
The purpose of the study presented here was to evaluate the effect of Tetraclean, Hypoclean, Chlor-XTRA, 2% chlorhexidine and 6% sodium hypochlorite/17% EDTA as a final irrigant on bacterial leakage of the root canal. One hundred and fifty-five extracted human...
Liming Wang et al.
Journal of nanoscience and nanotechnology, 14(6), 4224-4228 (2014-04-18)
Tetragonal Barium titanate (BaTiO3) nanotube arrays have been prepared using the template-assisted hydrothermal method combined with an annealing process. The in-situ chemical conversion of TiO2 nanotube array templates ensured that BaTiO3 maintained the morphology of the nanotube architectures. Moreover, X-ray...
Endodontic canal preparation: innovations in glide path management and shaping canals.
Clifford J Ruddle et al.
Dentistry today, 33(7), 118-123 (2014-08-15)
Sepideh Minagar et al.
Journal of biomedical materials research. Part A, 101(9), 2726-2739 (2013-02-26)
Titanium and titanium alloy implants that have been demonstrated to be more biocompatible than other metallic implant materials, such as Co-Cr alloys and stainless steels, must also be accepted by bone cells, bonding with and growing on them to prevent...
Dieter C Wirtz et al.
Acta orthopaedica, 85(6), 562-569 (2014-09-02)
Due to the relative lack of reports on the medium- to long-term clinical and radiographic results of modular femoral cementless revision, we conducted this study to evaluate the medium- to long-term results of uncemented femoral stem revisions using the modular...
Renée C Pompei-Reynolds et al.
American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics, 146(2), 215-226 (2014-08-03)
The manufacturing process for copper-nickel-titanium archwires is technique sensitive. The primary aim of this investigation was to examine the interlot consistency of the mechanical properties of copper-nickel-titanium wires from 2 manufacturers. Wires of 2 sizes (0.016 and 0.016 × 0.022...
Chuanlong Wu et al.
Biochemical pharmacology, 93(1), 59-71 (2014-12-03)
Titanium (Ti) particle-induced periprosthetic osteolysis and subsequent aseptic loosening are a primary reason for total hip arthroplasty failure. The aim of this study was to assess the effect of myricetin on Ti particle-induced osteolysis and osteoclastogenesis. We demonstrated that myricetin...
Deniss Klauson et al.
Environmental technology, 35(17-20), 2237-2243 (2014-08-26)
Photocatalytic water splitting for hydrogen and oxygen production requires sacrificial electron donors, for example, organic compounds. Titanium dioxide catalysts doped with platinum, cobalt, tungsten, copper and iron were experimentally tested for the production of hydrogen, oxygen and low molecular weight...
Fei Xiao et al.
Experimental cell research, 330(1), 91-101 (2014-07-13)
Wear particle-induced osteolysis and subsequent aseptic loosening remains the most common complication that limits the longevity of prostheses. Wear particle-induced osteoclastogenesis is known to be responsible for extensive bone erosion that leads to prosthesis failure. Thus, inhibition of osteoclastic bone...
Andreas Worni et al.
The International journal of prosthodontics, 28(1), 22-29 (2015-01-15)
The purpose of this study was to analyze the removal of implant-supported crowns retained by three different cements using an air-accelerated crown remover and to evaluate the patients' response to the procedure. This controlled clinical trial was conducted with 21...
Shinya Kato et al.
Journal of nanoscience and nanotechnology, 14(5), 3285-3291 (2014-04-17)
Microcorpuscular titanium dioxide (TiO2), a useful sunscreen agent, photocatalyzes generation of reactive oxygen species (ROS). We assessed protective effects of fullerene-C60 derivatives or microcolloidal platinum (Pt) against ultraviolet ray (UV)-irradiation in the presence of TiO2 in vitro. UV-irradiation (8 J/cm2...
Robert M Hinkle et al.
Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons, 72(8), 1495-1502 (2014-07-20)
The aim of this study was to test whether early loading (21 days after insertion) of implants with a hydrophilic surface is safe and reliable in a general clinical practice setting. This was a prospective multicenter clinical trial conducted in...
Terje Sjöström et al.
Nanomedicine (London, England), 8(1), 89-104 (2012-12-22)
Titanium (Ti) is used as a load-bearing material in the production of orthopedic devices. The clinical efficacy of these implants could be greatly enhanced by the addition of nanofeatures that would improve the bioactivity of the implants, in order to...
Emel Topuz et al.
Environmental pollution (Barking, Essex : 1987), 193, 37-44 (2014-07-08)
This study aims to investigate effects of freshwater components in order to predict agglomeration behavior of silver nanoparticles coated with citrate (AgNP-Cit), polyvinylpyrrolidone (AgNP-PVP), and of TiO2 nanoparticles. Agglomeration studies were conducted in various media based on combinations of ions...
Namrata Nataraj et al.
Journal of biomedical nanotechnology, 10(5), 864-870 (2014-04-17)
Staphylococcus aureus is one of the major causes of skin and soft tissue infections. In this study we compared the antimicrobial activity of two different TiO2 nanoformulations against Staphylococcus aureus. We synthesized TiO2 nanoparticles of approximately 80 nm diameter and...
R Nivea et al.
Journal of nanoscience and nanotechnology, 14(6), 4383-4386 (2014-04-18)
The removal of dye from industrial effluents is prime important, photo-catalysis is a finest method to combat dye from effluents. This study concerns about the investigation of photocatalytic activity of TiO2-HPAs (Hetropolyacids) nanocomposite namely TiO2-Phosphomolybdic nanocomposite [TiO2-HMA] and TiO2-Phosphotungstic nanocomposite...
Ya Shen et al.
Journal of endodontics, 39(2), 163-172 (2013-01-17)
The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and...
Shibin Li et al.
Chemosphere, 112, 62-69 (2014-07-23)
With a dramatic rise in complexity, needs of nanotoxicology research go beyond simple forms of nanomaterials. This study compared the phototoxicity of nano-TiO2 and graphene-TiO2 nanocomposite (GNP). GNP was synthesized based on a hydrothermal method, which simultaneously performed the reduction...
Dan Xu et al.
Journal of nanoscience and nanotechnology, 14(6), 4692-4699 (2014-04-18)
The V-based complex oxides were found to exhibit good catalytic reactivity for the selective oxidation of benzene to phenol. In order to understand the effect of the catalyst on the reaction, a series of Ag/VO(x)-TiO2 catalysts with different Ag loadings...
Aaron F Cipriano et al.
Journal of biomedical nanotechnology, 10(4), 660-668 (2014-04-17)
The objective of this study was to investigate the adhesion and morphology of bone marrow derived stromal cells (BMSCs) on bulk titanium (Ti) substrates with precisely-patterned surfaces consisting of groove-based gratings with groove widths ranging from 50 micro m down...
Xiaoyan Zou et al.
Aquatic toxicology (Amsterdam, Netherlands), 154, 168-175 (2014-06-09)
Due to their bactericidal and photocatalytic characteristics, silver nanoparticles (Ag NPs) and titanium dioxide nanoparticles (TiO2 NPs) are widely used in the fields of environment and physiology. Once these untreated nanoparticles are released into an aquatic environment and encounter one...
A T Tokarski et al.
The bone & joint journal, 97-B(1), 45-49 (2015-01-09)
We hypothesised that the use of tantalum (Ta) acetabular components in revision total hip arthroplasty (THA) was protective against subsequent failure due to infection. We identified 966 patients (421 men, 545 women and 990 hips) who had undergone revision THA...
Zi Fei Yin et al.
Physical chemistry chemical physics : PCCP, 15(14), 4844-4858 (2013-03-02)
As one of the most common chemical materials, titanium dioxide (TiO2) has been prepared and widely used for many years. Among all the applications, the biomedical applications of TiO2 have motivated strong interest and intensive experimental and theoretical studies, owing...