نتایج جستجو برای: resin composites statement of problem

تعداد نتایج: 21228781  

Journal: :Acta of bioengineering and biomechanics 2014
Jerzy ŁSokołowski Małgorzata Iwona Szynkowska Joanna Kleczewska Zygmunt Kowalski Agnieszka Sobczak-Kupiec Aleksandra Pawlaczyk Krzysztof Sokołowski Monika Łukomska-Szymańska

Silver and gold have been used for centuries as antimicrobial agents. The aim of the study was to investigate diametral tensile strength, microhardness, ion release and light transmission of experimental resin composites. Flowable dental composite SDR (Dentsply, United Kingdom) was modified by nanogold, nanosilver and silica addition. The metal ion release, light transmission study, microhardne...

2011
Yiming Weng Xia Guo Voon Joe Chong Leah Howard Richard L. Gregory Dong Xie

The novel quaternary ammonium bromide (QAB)containing oligomers were synthesized and applied for developing an antibacterial resin composite. Compressive strength (CS) and S. mutans (an oral bacteria strain) viability were used to evaluate the mechanical strength and antibacterial activity of the formed composites. All the QAB-modified resin composites showed significant antibacterial activity ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شاهد - دانشکده فنی و مهندسی 1387

abstract biometric access control is an automatic system that intelligently provides the access of special actions to predefined individuals. it may use one or more unique features of humans, like fingerprint, iris, gesture, 2d and 3d face images. 2d face image is one of the important features with useful and reliable information for recognition of individuals and systems based on this ...

Journal: :علوم و تکنولوژی پلیمر 0
مریم حاجی حسینی آرش پیامی سیدرضا غفاریان امیرمسعود رضادوست

in the processing of carbon/carbon composites using polymer resin as the matrix precursor, it is inevitable that a porous structure was formed after carbonization. as a result, densification by liquid phase impregnation followed by recarbonization is required to obtain a densified composite. consequently, the char formability of resin is an important factor in reducing the number of densificati...

2016
Nannan Hu Ke Wang Hongming Ma Wanjiang Pan Qingqing Chen

The glass fiber reinforced epoxy resin composites play an important role in superconducting Tokamak, which are used to insulate the metal components, such as superconducting winding, cooling pipes, metal electrodes and so on. For the components made of metal and glass fiber reinforced epoxy resin composites, thermal shrinkage leads to non-ignorable thermal stress, therefore, much attention shou...

Journal: :journal of lasers in medical sciences 0
nazanin zeinab garshasbzadeh operative dentistry department, school of dentistry, tehran university of medical sciences,tehran,iran mansoreh mirzaie operative dentistry department, school of dentistry, tehran university of medical sciences,tehran,iran esmael yassini operative dentistry department, school of dentistry, tehran university of medical sciences,tehran,iran sima shahabi laser research center of dentistry, school of dentistry, tehran university of medial science,tehran,iran nasim chiniforush laser research center of dentistry, school of dentistry, tehran university of medial science,tehran,iran

introduction: indirect composites are developed to overcome the shortcomings of direct composites but, the adhesion of resin cements to indirect composites is still difficult. the purpose of this study was to evaluate the surface morphology of indirect resin composite treated by different powers of er:yaglaser using scanning electron microscopy (sem). methods: indirect resin composite blocks (g...

Journal: :The Chinese journal of dental research : the official journal of the Scientific Section of the Chinese Stomatological Association 2012
Lippo V J Lassila Emre Nagas Pekka K Vallittu Sufyan Garoushi

OBJECTIVE To evaluate the translucency characteristics of new flowable bulk-filling resin composites at various thicknesses. Experimental short fibre-reinforced composite was also tested. METHODS Two new brands of flowable bulk composites (Venus Bulk Fill and SureFil SDR Flow), experimental short fibre-reinforced resin composite (FC) and, as control, conventional flow (Filtek Supreme Flow XT ...

Journal: :Biomaterials 2003
D Skrtic J W Stansbury J M Antonucci

Because of its relatively high solubility in aqueous media and its rapid transformation to hydroxyapatite, amorphous calcium phosphate (ACP) has been utilized as the filler phase of resin-based bioactive composites that have remineralization potential. The objectives of this study were to determine how various methacrylate resins and various types of ACP fillers affect acrylic vinyl conversion ...

Journal: :Operative dentistry 2008
Zeynep Ergücü L Sebnem Türkün Akin Aladag

OBJECTIVE This study compared the color changes of five novel resin composites polished with two one-step polishing systems when exposed to coffee solution. METHODS The resin composites tested were Filtek Supreme XT, Grandio, CeramX, Premise and Tetric EvoCeram. A total of 150 discs (30/resin composites, 10 x 2 mm) were fabricated. Ten specimens/resin composites cured under Mylar strips serve...

Journal: :avicenna journal of dental research 0
m shirinzad assistant professor, department of operative dentistry, dental faculty, hamadan university of medical sciences, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) sh kasraei associate professor, dental research center, department of operative dentistry, dental faculty, hamadan university of medical sciences, iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی همدان (hamadan university of medical sciences) m azarsina assistant professor, department of operative dentistry, dental faculty , international branch of shahid beheshti univeسازمان اصلی تایید شده: دانشگاه علوم پزشکی شهید بهشتی (shahid beheshti university of medical sciences)

statement of the problem addition of metallic nano-particles to composite resins can change their water contact angle purpose the aim of this study was to evaluate the effect of addition of nano-particles of silver and zinc oxide to composite resins on their water contact angle materials and methods this in vitro study was performed on 60 composite resin samples. nano-silver and nano-zinc oxide...

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