نتایج جستجو برای: glasspolyester composite

تعداد نتایج: 121604  

A. Kodge A. Lagashetty, S. Kalyane

Nanosized metal oxides dispersed polymer composites constitute a fascinating class of polymer composite materials. Synthesis of such composite materials through solvent casting enhances the polymer synthetic technology. Solvent casting method was used to prepare Cobalt oxide (Co3O4) dispersed Poly (methyl methacrylate) (PMMA) nano composite<span style="text-decoration: und...

1994
T. Asaka Ken-ichi Hikasa

We calculate four-fermion decays of a Higgs boson via WW and/or ZZ intermediate states for Higgs masses below mW . We examine models with a doublycharged Higgs boson H and show that the four-fermion decay is the dominant mode for a wide range of parameter space. Existing searches for H in Z decays have not looked for this mode. We also derive four-fermion decay rate for a neutral Higgs boson.

Journal: :Physical review letters 2003
Kerwin C Foster N E Bonesteel Steven H Simon

We develop a phenomenological description of the nu=5/2 quantum Hall state in which the Halperin-Lee-Read theory of the half-filled Landau level is combined with a p-wave pairing interaction between composite fermions (CFs). The electromagnetic response functions for the resulting mean-field superconducting state of the CFs are calculated and used in an RPA calculation of the q and omega depend...

Journal: :journal of dentistry, tehran university of medical sciences 0
z. khamverdi associated professor, research center of dentistry, university of medical sciences, hamadan, iran sh. kasraie associated professor, department of operative dentistry and dental research center, school of dentis l. rezaei-soufi assistant professor, department of operative dentistry, school of dentistry, hamadan university of m s. jebeli dentist in private practice

introduction: whitening toothpastes which have been accepted in populations may affect properties of enamel and restorative materials. the aim of this study was to compare the microhardness of human enamel and z250 microhybrid composite resin after brushing with two whitening toothpastes. materials and methods: in this experimental study of enamel specimens, forty five freshly extracted human i...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
zahra jaberi ansari dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran amir ghasemi dept. of restorative dentistry, school of dentistry, shahid beheshti university of medical sciences, tehran, iran mohammad taghi vatandoust dentist, lecturer, school of dentistry, shahed university, tehran, iran mojdeh kalantar motamedi dentist, lecturer, school of dentistry, shahed university, tehran, iran

objectives: the aim of this study was to compare polymerization depth of two bulk-fill and one conventional composite cured for different times. methods: this in vitro experimental study was conducted on 54 composite samples (2×4×10mm) fabricated of tetric n-ceram bulk-fill, x-tra fil bulk-fill, and grandio conventional composite cured for 20, 30, and 40 seconds. the microhardness of samples wa...

Journal: :journal of dentistry, tehran university of medical sciences 0
hassan torabzadeh associate professor, iranian center for endodontic research, research institute of dental sciences, shahid beheshti university of medical sciences, tehran, iran. amir ghasemi associate professor, dental research center, research institute of dental sciences of shahid beheshti university of medical sciences, tehran,iran. atoosa dabestani private practice, preventive dentistry research center, research institute of dental sciences of, shahid beheshti university of medical sciences, tehran, iran. sara razmavar reseach fellow, preventive dentistry research center, research institute of dental sciences of, shahid beheshti university of medical sciences, tehran, iran.

tooth fracture is a common dental problem. by extension of cavity dimensions, the remaining tooth structure weakens and occlusal forces may cause tooth fracture. the aim of this study was to evaluate and compare the fracture resistance of teeth restored with direct and indirect composite restorations.sixty-five sound maxillary premolar teeth were chosen and randomly divided into five groups eac...

Journal: :journal of dentistry, tehran university of medical sciences 0
shahram mosharrafian zeynab sharifi

objectives: this study sought to compare the push-out bond strength of two bulk-fill and one conventional composite to intracanal dentin in primary anterior teeth. materials and methods: this in vitro, experimental study was conducted on 39 primary anterior teeth, which were randomly divided into three groups. after cleaning and shaping, the root canals were filled with metapex in such a way th...

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