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V Gibory, A Robelet, J Riou, A-V Lebelle Dehaut
Unlike EN 554, and since the publication of ISO 17665-1 standard, the user of autoclaves may use methods other than those indicated in the guidelines. Outsourcing the requalification of sterilizers by an external service provider and after observing from the previous requalification reports that the thermometric data seemed reproducible, we decided to propose and validate a validation method for the reproducibility of the sterilization process. This is to exempt from the study of the repeatability of the EN 554 standard in future requalifications...
December 4, 2017: Annales Pharmaceutiques Françaises
Laurent Venet, Michel Perriat, Francesco Guido Mangano, Thomas Fortin
BACKGROUND: Different surgical procedures have been proposed to achieve horizontal ridge reconstruction of the anterior maxilla; all these procedures, however, require bone replacement materials to be adapted to the bone defect at the time of implantation, resulting in complex and time-consuming procedures. The purpose of this study was to describe how to use a 3D printed hardcopy model of the maxilla to prepare customized milled bone blocks, to be adapted on the bone defect areas using a minimally invasive subperiosteal tunneling technique...
December 8, 2017: BMC Oral Health
Yao Zhang, Dengwu Zhao, Fan Yu, Chao Yang, Jinwei Lou, Yanming Liu, Yingying Chen, Zhongyong Wang, Peng Tao, Wen Shang, Jianbo Wu, Chengyi Song, Tao Deng
This paper presents a new steam sterilization approach that uses a solar-driven evaporation system at the water/air interface. Compared to the conventional solar autoclave, this new steam sterilization approach via interfacial evaporation requires no complex system design to bear high steam pressure. In such a system, a reduced graphene oxide/polytetrafluoroethylene composite membrane floating at the water/air interface serves as a light-to-heat conversion medium to harvest and convert incident solar light into localized heat...
December 5, 2017: Nanoscale
Jonas Häusler, Robin Niklaus, Ján Minár, Wolfgang Schnick
Grimm-Sommerfeld analogous nitrides MgSiN2, MgGeN2, MnSiN2, MnGeN2, LiSi2N3 and LiGe2N3 (generally classified as II IV N2 and I-IV2-N3) are promising semiconductor materials with great potential for application in (opto)electronics or photovoltaics. A new synthetic approach for these nitride materials was developed using supercritical ammonia as solvent and nitriding agent. Syntheses were conducted in custom-built high-pressure autoclaves with alkali metal amides LiNH2, NaNH2 or KNH2 as ammonobasic mineralizers which accomplish an adequate solubility of the starting materials and promote the formation of reactive intermediate species...
December 4, 2017: Chemistry: a European Journal
Dominic Anto, Raju Paul Manjooran, Rajeev Aravindakshan, Kumar Lakshman, Raymond Morris
Context: Decompressive craniectomy followed by cranioplasty (CP) uses autologous craniectomy flaps or synthetic materials like titanium. Sterilization and preservation methods for the autologous bone flaps continue to be the surgeon's choice. Aim: This study aimed to assess the short-term as well as long-term clinical outcomes of CP using autoclaved autologous bone grafts. Settings and Design: This retrospective observational study was performed on patients admitted in a tertiary care teaching neurosurgery department...
October 2017: Journal of Neurosciences in Rural Practice
Masoud Khabiri, Maziar Ebrahimi, Mohammad Reza Saei
Statement of the Problem: File fracture can interfere with cleaning and shaping of the canal and compromise periradicular healing. Autoclave sterilization may prone the files to fracture. Purpose: The purpose of the present study was to determine the effect of autoclave sterilization on the cyclic fatigue resistance of Hero642 rotary instrument in two curvatures of 45 and 60 degrees. Materials and Method: For this experimental in-vitro study, 90 Nickel-Titanium HERO 642 rotary files #30 with 0...
December 2017: Journal of Dentistry
Maryam Forghani, Elham Afshari, Iman Parisay, Reza Garajian
Background. This in vitro study aimed to compare the antibacterial effect of different concentrations of sodium hypochlorite on elimination of Enterococcus faecalis from root canal systems of primary teeth with or without a passive sonic irrigation system (EndoActivator). Methods. The root canals of 120 extracted single-rooted primary incisors were prepared using the crown-down technique. The teeth were autoclaved and inoculated with E. faecalis. The infected samples were then randomly divided into 6 experimental groups of 15 and positive and negative control groups as follows: group 1: 0...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
Aifang Han, James K H Tsoi, Jukka P Matinlinna, Yu Zhang, Zhuofan Chen
OBJECTIVE: The current laboratory study was to investigate the effect of different sterilization treatments on surface characteristics of zirconia, and biofilm formation on zirconia surface after exposure to these sterilization treatments. METHODS: Commercially available zirconia discs (Cerconbase, Degu-Dent, Hanau, Germany) were prepared and polished to the same value of surface roughness. The discs were treated with one of the following sterilization methods steam autoclave sterilization, dry heat sterilization, ultraviolet C (UVC) irradiation, and gamma (γ) ray irradiation...
November 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
Rosa Dargahi, Homeira Ebrahimzadeh, Ali Akbar Asgharinezhad, Alireza Hashemzadeh, Mostafa M Amini
In this study, a magnetic metal-organic framework was synthesized simply and utilized in the dispersive magnetic solid-phase extraction of five phthalate esters followed by their determination by gas chromatography with mass spectrometry. First, MIL-101(Cr) was prepared hydrothermally in water medium without using highly corrosive hydrofluoric acid, utilizing an autoclave oven heat supply. Afterward, Fe3 O4 nanoparticles were decorated into the matrix of MIL-101(Cr) to fabricate magnetic MIL-101 nanocomposite...
November 26, 2017: Journal of Separation Science
Adeline Lacerda Jorjão, Felipe Eduardo de Oliveira, Mariella Vieira Pereira Leão, Antonio Olavo Cardoso Jorge, Luciane Dias de Oliveira
This study evaluated the prophylactic effects of the live or heat-killed probiotic strain Lactobacillus rhamnosus ATCC 7469 in Galleria mellonella, inoculated with Staphylococcus aureus or Escherichia coli. L. rhamnosus suspension was prepared and a part of it was autoclaved to obtain heat-killed lactobacilli. The larvae were inoculated of these suspensions and pathogenic. The survival of the larvae was observed during 7 days and after 24 h of inoculation haemocytes counted, melanization and nitric oxide production were analyzed...
November 24, 2017: Archives of Microbiology
T T Yohe, B D Enger, L Wang, H L M Tucker, C A Ceh, C L M Parsons, Z Yu, K M Daniels
Megasphaera elsdenii is a bacterial species of the rumen that can utilize lactate to produce butyrate, a key volatile fatty acid often implicated in driving calf rumen development. Because lactate is abundant in the rumen of young calves, administration of M. elsdenii to increase butyrate production and thus promote calf rumen development is an appealing possibility. The main objective of this study was to determine whether M. elsdenii administration to calves via oral drench at 14 d of age affected its long-term establishment at 70 d postadministration...
November 22, 2017: Journal of Dairy Science
Takayuki Takei, So Danjo, Shogo Sakoguchi, Sadao Tanaka, Takuma Yoshinaga, Hiroto Nishimata, Masahiro Yoshida
Moist wounds were known to heal more rapidly than dry wounds. Hydrogel wound dressings were suitable for the moist wound healing because of their hyperhydrous structure. Chitosan was a strong candidate as a base material for hydrogel wound dressings because the polymer had excellent biological properties that promoted wound healing. We previously developed physically-crosslinked chitosan cryogels, which were prepared solely by freeze-thawing of a chitosan-gluconic acid conjugate (CG) aqueous solution, for wound treatment...
November 19, 2017: Journal of Bioscience and Bioengineering
Luis Henrique Lira, Flávio E Hirai, Marivaldo Oliveira, Waldir Portellinha, Eliane Mayumi Nakano
PURPOSE: To identify the causes of a diffuse lamellar keratitis (DLK) outbreak using a systematic search tool in a case-control analysis. METHODS: An Ishikawa diagram was used to guide physicians to determine the potential risk factors involved in this outbreak. Coherence between the occurrences and each possible cause listed in the diagram was verified, and the total number of eyes at risk was used to calculate the proportion of affected eyes. Multivariate analysis was performed using logistic regression to determine the independent effect of the risk factors, after controlling for confounders and test interactions...
September 2017: Arquivos Brasileiros de Oftalmologia
Hosam I Salaheldin, Amr Negm, Gamal E H Osman
Silver nanoparticles (AgNPs) were synthesised with hydrothermal autoclaving technique by using AgNO3 salt (silver precursor) at different concentrations (0.01, 0.1, 0.55, 1.1, 5.5, and 11 mM) and porcine skin (1% (w/v) ) gelatin polymeric matrix (reducing and stabiliser agent). The reaction was performed in an autoclave at 103 kPa and 121°C and the hydrothermal autoclaving exposure time and AgNO3 molar concentration were varied at a constant porcine skin gelatin concentration. The as-prepared AgNPs were characterised by UV-visible spectroscopy, transmission electron microscopy, and Fourier transform infrared spectroscopy...
December 2017: IET Nanobiotechnology
Thomas Krauße, Eileen Schütze, René Phieler, David Fürst, Dirk Merten, Georg Büchel, Erika Kothe
Microbiome analyses of soils and microcosm experiments depend on conditions that include sterilization in order to perform experimental manipulation of microbial communities. Still, they should represent conditions close to nature. When using metal contaminated soils, sterilization methods might alter metal availability. Here, four typical metal contaminated substrates were analyzed, representing different contamination histories and soil types. They included two very poor substrates, as they are often found at metal contaminated sites...
November 10, 2017: Journal of Hazardous Materials
Taha Özyürek, Koray Yılmaz, Gülşah Uslu
Objectives: It was aimed to compare the cyclic fatigue resistances of ProTaper Universal (PTU), ProTaper Next (PTN), and ProTaper Gold (PTG) and the effects of sterilization by autoclave on the cyclic fatigue life of nickel-titanium (NiTi) instruments. Materials and Methods: Eighty PTU, 80 PTN, and 80 PTG were included to the present study. Files were tested in a simulated canal. Each brand of the NiTi files were divided into 4 subgroups: group 1, as received condition; group 2, pre-sterilized instruments exposed to 10 times sterilization by autoclave; group 3, instruments tested were sterilized after being exposed to 25%, 50%, and 75% of the mean cycles to failure, then cycled fatigue test was performed; group 4, instruments exposed to the same experiment with group 3 without sterilization...
November 2017: Restorative Dentistry & Endodontics
Tamrat Tesfaye, Bruce Sithole, Deresh Ramjugernath, Luyanda Ndlela
Commercially processed, untreated chicken feathers are biologically hazardous due to the presence of blood-borne pathogens. Prior to valorisation, it is crucial that they are decontaminated to remove the microbial contamination. The present study focuses on evaluating the best technologies to decontaminate and pre-treat chicken feathers in order to make them suitable for valorisation. Waste chicken feathers were washed with three surfactants (sodium dodecyl sulphate) dimethyl dioctadecyl ammonium chloride, and polyoxyethylene (40) stearate) using statistically designed experiments...
November 10, 2017: Waste Management
Corrado Scarnato, Rossella Rambaldi, Gianpiero Mancini, Sandra Olanda, Maria Rosa Spagnolo, Elisabetta Previati, Valerio Parmeggiani, Salvatore Minisci, Pietro Comba, Roberta Pirastu
OBJECTIVES: to update the mortality study of subjects exposed to vinyl chloride in the phases of synthesis of the monomer and polymerization in the plants of Ferrara and Ravenna (Emilia-Romagna Region, Northern Italy). DESIGN: both for the whole cohort and for the two plants, standardized mortality ratios (SMRs), with 95% confidence intervals (95%CI), were calculated for different death causes, then stratified by duration and latency, periods of the beginning of work and cumulative exposure (ppm-years)...
September 2017: Epidemiologia e Prevenzione
Rodrigo Diniz Prado, Gabriel Kalil Rocha Pereira, Marco Antonio Bottino, Renata Marques de Melo, Luiz Felipe Valandro
Monolithic restorations of Y-TZP have been recommended as a restorative alternative on prosthetic dentistry as it allows a substantial reduction of ceramic thickness, which means a greater preservation of tooth structure. However, the influence of grinding and aging when using a thinner layer of the material is unclear. This investigation aimed to evaluate and compare the effects of ceramic thickness (0.5 mm and 1.0 mm), grinding and aging (low-temperature degradation) on the mechanical behavior and surface characteristics of a full-contour Y-TZP ceramic...
November 6, 2017: Brazilian Oral Research
Heloisa Nascimento, Cristina Viana-Niero, Christiane Lourenço Nogueira, Paulo José Martins Bispo, Fernando Pinto, Camila de Paula Pereira Uzam, Cristianne Kayoko Matsumoto, Antônia Maria Oliveira Machado, Sylvia Cardoso Leão, Ana Luisa Höfling-Lima, Denise de Freitas
PURPOSE: Nontuberculous mycobacteria keratitis is a rare but challenging complication of laser in situ keratomileusis (LASIK). This study was conducted to determine the source(s) of infection in a cluster of cases of keratitis after LASIK and to describe this outbreak and patients' outcomes. METHODS: In this retrospective, case series, single-center study, 86 patients were included who underwent LASIK or photorefractive keratectomy between December 2011 and February 2012...
November 2, 2017: Cornea
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