نتایج جستجو برای: glasspolyester composite

تعداد نتایج: 121604  

E. Borhani S. Alalhessabi S.A. Manafi

In this study, aluminum (Al) matrix reinforced with micro-particles (30 µm) and nano-particles (50 nm) boron carbide (B4C) were used to prepare Al-2.5%wt., B4C nano-composite and micro-composite, respectively, using mechanical alloying method. The mixed powders were mechanically milled at 5, 10, 15 and 20 hrs. The XRD results indicated that the crystallite sizes of both the micro-composite and ...

مریم احتشام‌زاده, , مصطفی علیزاده, , میلاد طالبیان, ,

In this study, Al/Steel multilayer composite was produced by accumulative roll bonding (ARB) process using Al-1100 and St-12 strips. Microstructure, mechanical properties and corrosion behavior of the composite were studied by scanning electron microscopy (SEM), tensile test, Vickers microhardness tests, cyclic polarization and electrochemical impedance spectroscopy (EIS) measurement in 3.5 wt%...

Journal: :jentashapir journal of health research 0
faezeh abolghasemzade department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol, ir iran homayon alaghehmand dental material research center, department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol, ir iran reza judi dental material research center, department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol, ir iran; dental material research center, department of operative dentistry, faculty of dentistry, babol university of medical sciences, babol, ir iran. tel: +98-9354699621, fax: +98-1132291093

conclusions the most common cause of restoration replacement in patients referred to the babol university of dentistry during years 2013 and 2014 was secondary caries that were found in class ii restorations. patients and methods age, sex, type of occlusion, dmf, existing parafunction, type of tooth, class and reason of composite restoration replacement was recorded for patients who had referre...

Journal: :مجله دندانپزشکی 0
اسماعیل یاسینی e. yasini نرمین محمدی n. mohammadi

polymerization contraction may produce defects in the composite - tooth bond. this may lead to bond failure and microleakage. the aim of this study was to reduce microleakage of posterior composites using different methods. 45 molar and premolars extracted teeth were choosen. the cavities were randomly assigned into 5 groups of 9. box-shaped cavities were prepared on each side of proximal surfa...

Journal: :journal of dentistry, shiraz university of medical sciences 0
farahnaz sharafeddin dept. of operative dentistry, biomaterials research center, school of dentistry, shiraz university of medical sciences, shiraz, iran. fatemeh koohpeima dept. of operative dentistry, school of dentistry, shiraz university of medical sciences, shiraz, iran. nader razazan undergraduate student, school of dentistry, shiraz university of medical sciences, shiraz, iran.

statement of the problem: the bond strength of composites with different adhesive systems with dentin is an important factor in long term durability of composite restorations. the effect of titanium tetrafluoride (tif4) as anti caries agent and sodium hypochlorite (naocl) as disinfectant on the shear bond of nanofilled and silorane based composite resins have not been investigated in previous s...

Journal: :مجله دانشکده دندانپزشکی اصفهان 0
f - shirani mr malekipour p mirzakouchaki m - ghafournia

abstract: introduction: ditching and marginal defects of amalgam restorations can cause microleakage, recurrent carries, pulp hypersensitivity and finally loss of the tooth. the complete replacement of large restoration is time consuming, difficult and may potentially damage the pulp. therefore in cases were there is no sings of recurrent caries, composite repair can be chosen as an alternative...

Journal: :علوم و تکنولوژی پلیمر 0
محمودمهرداد شکریه فتح اله طاهری بهروز

because of inhomogeneity and anisotropy of composite materials, defining a unique fatigue criterion to be suitable for different loading conditions is much more difficult in comparison with traditional materials. for this reason many tests on evaluating the damages such as crack density, stiffness reduction and residual strength are used by various researchers to monitor the fatigue process. in...

Journal: :journal of dental research, dental clinics, dental prospects 0
mohammad joulaei mahmoud bahari faculty of dentistry, tabriz university of medical sciences anahid ahmadi siavash savadi oskoee

background and aims. effect of surface treatments on repair bond strength of aged composite resins might be different due to their dissimilar fillers. the aim was to evaluate the effect of different surface treatments on repair micro-shear bond strength (µsbs) of silica- (spectrum tph) and zirconia-filled (filtek z250) composite resins. materials and methods. twenty-seven composite resin blocks...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
a ghassemi dept. of operative dentistry, dental school, shahid beheshti university of medical sciences, tehran, iran. sh emamieh dept. of operative dentistry, dental school, shahid beheshti university of medical sciences, tehran, iran. a soroudi h torabzadeh dept. of operative dentistry, dental school, shahid beheshti university of medical sciences, tehran, iran. v akhavan zanjani dept. of operative dentistry, dental school, shahid beheshti university of medical sciences, tehran, iran m abdo tabrizi dept. of operative dentistry, dental school, shahid beheshti university of medical sciences, tehran, iran

objective: selection of an appropriate shade of composite is critical in achieving an esthetic restoration. different systems are used to assess and describe color parameters. this study aimed to assess the effect of color and thickness of filtek supreme (fs) and premise (p) composite resins on correction of tooth discoloration.   methods: in this in vitro experimental study, 10 anterior teeth ...

Journal: :journal of dental research, dental clinics, dental prospects 0
abiodun arigbede department of restorative dentistry, faculty of dentistry, university of port harcourt, port harcourt, nigeria bukola folasade adeyemi department of oral pathology, faculty of dentistry college of medicine, university of ibadan ibadan, oyo state. omowumi femi-akinlosotu department of anatomy, faculty of basic medical sciences college of medicine, university of ibadan ibadan, oyo state, nigeria

background and aim: in vitro studies have revealed a direct association between resin content and cytotoxicity of resin composites; but implantation studies in this regard are sparse. this study investigates the relationship between filler content of composite resins and biocompatibility. materials and methods: this study was conducted using 18 male wistar rats (180-200g), 1 nano-hybrid (prime-...

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