نتایج جستجو برای: glasspolyester composite

تعداد نتایج: 121604  

Journal: :journal of lasers in medical sciences 0
parisa parhami school of dentistry, tehran university of medical sciences, tehran, iran seyed jalal pourhashemi department of pediatric dentistry, school of dentistry, tehran university of medical sciences, tehran , iran mehdi ghandehari department of pediatric dentistry, school of dentistry, tehran university of medical sciences, tehran , iran ghasem mighani department of pediatric dentistry, school of dentistry, tehran university of medical sciences, tehran , iran nasim chiniforush laser research center of dentistry (lrcd), school of dentistry, tehran university of medical sciences, tehran, iran

introduction :the aim of this study was to evaluate and compare the in vitro effect of the erbium-doped yttrium aluminum garnet (er:yag) laser with different radiation distances and high-speed rotary treatment on the shear bond strength of flowable composite to enamel of human permanent posterior teeth . methods : freshly extracted human molar teeth with no caries or other surface defects were ...

Journal: :journal of dental research, dental clinics, dental prospects 0
niloofar shadman assistant professor , department of operative dentistry,faculty of dentistry, kerman university of medical sciences shahram farzin ebrahimi assistant professor, kerman university of medical sciences najmeh mollaie assistant professor, department of orthodontics, faculty of dentistry, rafsanjan university of medical sciences, rafsanjan, iran

background. hemostatic agents are applied to prepare an isolated bleeding-free condition during dental treatments and can influence adhesive restorations. this study evaluated the effect of a hemostatic agent (viscostat) on microleakage of contaminated dentinal margin of class v composite resin restorations with three adhesives. methods. sixty freshly extracted human molars were selected and cl...

Journal: :journal of dental research, dental clinics, dental prospects 0
farahnaz sharafeddin associate professor samira zare assistant professor zahra javanmardi postgraduate student

background and aims. bleaching may exert some negative effects on existing composite resin restorations. the aim of this study was to evaluate the effect of home bleaching on microleakage of fiber-reinforced and particle-filled composite resins. materials and methods. ninety class v cavities (1.5×2×3 mm) were prepared on the buccal surfaces of 90 bovine teeth. the teeth were randomly divided in...

Journal: :journal of dental research, dental clinics, dental prospects 0
parnian alizadeh oskoee narmin mohammadi mohammad esmaeel ebrahimi chaharom soodabeh kimyai fatemeh pournaghi azar sahand rikhtegaran

background and aims. the aim of the present study was to compare the effect of surface treatment with er; cr:yssg, nd:yag, and co2 lasers on repair shear bond strength of a silorane-based composite resin. materials and methods. sixty eight cylindrical samples of a silorane-based composite resin (filtek silorane) were prepared and randomly divided into 4 groups as follows: group 1: without surfa...

Journal: :journal of dentistry, tehran university of medical sciences 0
m. khoroushi sh. motamedi

objective: different ceramic repair systems have been reported for fractured ceramics. however, limited information is available concerning the bond strength of these systems especially after thermocycling. the aim of this in-vitro study was to determine the effect of thermocycling on the shear bond strength of composite-resin to feldspathic porcelain with and without silane pretreatment. mater...

Journal: :journal of dentistry, tehran university of medical sciences 0
maryam khoroushi associate professor, dental materials research center and department of operative dentistry, school of dentistry, isfahan university of medical sciences, isfahan, iran. farinaz shirban mohammadreza shirban

in recent years, newly developed solvent-free dental adhesives have been introduced. the aim of this study was to evaluate the marginal integrity of a new one-step solvent-free self-etch adhesive and to compare it with a commonly used two-step self-etch adhesive as the gold standard.class v cavities (2×4×1.5 mm) were prepared on the buccal aspects of 28 human premolars. the cervical margins of ...

Journal: :journal of dentistry, tehran university of medical sciences 0
sedigheh sadat hashemikamangar seyed jalal pourhashemi zohre nekooimehr mehrzad gholampur dehaki mohamad javad kharazifard

objectives: to assess the effect of lactic acid (la) on microleakage of silorane-based composite restorations and methacrylate-based composites with self-etch and etch-and-rinse bonding systems. materials and methods: class v cavities were prepared in 120 extracted human teeth, divided into four groups and restored as follows: 1. silorane-based composite+p90 adhesive system (p90); 2. filtek z25...

Journal: :iranian journal of basic medical sciences 0
elham khodaverdi department of pharmaceutics, school of pharmacy, mashhad university of medical sciences, mashhad, iran omid rajabi department of medicinal chemistry, school of pharmacy, mashhad university of medical sciences, mashhad, iran mohammad abdekhodai department of pharmaceutics, school of chemical engineering, sharif university, tehran, iran xiao yu wu department of pharmaceutics, school of pharmacy, university of toronto, toronto, canada

objective(s) in this study, a kind of ph sensitive composite membrane was prepared and drug permeation through it was investigated in terms of ph. rationale of this study originated from the fact that a ph change which may be a result of a disease state in the body can trigger drug release. materials and methods  here, a kind of ph sensitive composite membrane containing different nanoparticle ...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
ساینا شمس زاده sayna shamszadeh وقارالدین اخوان زنجانی vaghareddin akhavan zanjani dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. مریم مفیدی maryam mofidi dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. مریم عبده تبریزی maryam abdo tabrizi dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. صنمبر یزدانی sanambar yazdani

objective: despite great advances made in dental composite resins, their use is associated with some concerns regarding their mechanical properties such as their flexural strength. considering the introduction of different composite resins into the market, there is a need to compare their mechanical properties and particularly flexural strength. this study aimed to compare the flexural strength...

Journal: :journal of ultrafine grained and nanostructured materials 2013
m. m. shokrieh a. daneshvar m. chitsazzadeh

in this research, a novel method to decrease micro-residual stresses of fibrous composites by adding carbon nanotubes (cnts) is proposed in detail. the negative coefficient of thermal expansion and the high young’s modulus of cnts can be utilized to counterbalance the process induced residual stresses in composites. to this end, first, the effects of adding cnts to the matrix of fibrous composi...

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