نتایج جستجو برای: polishing

تعداد نتایج: 3963  

2016
Rashmi G. Chour Aman Moda Arpana Arora Muhmmed Y. Arafath Vikram K. Shetty Yousef Rishal

AIMS AND OBJECTIVES Satisfactory composite restoration depends upon its smooth finish, quality of polishing agents, type of composite material used, and its composition. The present study evaluated the effect of different polishing systems on the surface roughness of composite resin. MATERIALS AND METHODS Forty discs of composite were prepared and equally subjected to different finishing and ...

Journal: :Dental materials journal 2010
Vygandas Rutkunas Vaidotas Sabaliauskas Hiroshi Mizutani

The main objective was to investigate the effects of different polishing techniques on the color stability of provisional prosthetic materials upon exposure to different staining agents by mimicking the oral environment in vitro. Fifty-six cylindrical specimens were prepared for each type of material: bis-acryl and light-polymerized composite resins, and methyl methacrylate- and ethyl methacryl...

2017
Jing Lu Yongchao Xu Dayu Zhang Xipeng Xu

In this study, the synthesis of the core/shell structured diamond/akageneite hybrid particles was performed through one-step isothermal hydrolyzing. The hybrid particle was characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier transform infrared spectra. The test results overall reveal that the akageneite coating, phase β-FeO(OH), was uniformly coated onto...

Journal: :General dentistry 2015
Henry St Germain Bart A Samuelson

This in vitro study determined the surface roughness (Ra) and absolute gloss (AG) values for 2 resin composites: a microhybrid and a microfill. Eight groups (n = 4) of each resin composite were prepared, along with 4 controls (Mylar strip) for the 2 resin composites. After finishing with a medium polishing disc, the specimens from each resin composite material were subjected to 7 polishing proc...

Journal: :journal of dentistry, tehran university of medical sciences 0
farzin heravi associate professor, department of orthodontics, school of dentistry and dental research center, mashhad university of medical sciences, mashhad, iran hooman shafaee assistant professor, department of orthodontics, school of dentistry and dental research center, mashhad university of medical sciences, mashhad, iran mojtaba abdollahi pedodontist. mashhad, iran roozbeh rashed assistant professor, department of orthodontics, school of dentistry and dental research center, mashhad university of medical sciences, mashhad, iran

o bjectives: the objective of this study was to assess the effect of new bonding techniques on enamel surface. materials and methods: sixty upper central incisors were randomly divided into two equal groups. in the first group, metal brackets were bonded using trans- bondxt and, in the second group, the same brackets were bonded with maxcemelite. the shear bond strength (sbs) of both agents to ...

Journal: :Dental materials journal 2013
Emine Sirin Karaarslan Mehmet Bulbul Esma Yildiz Asli Secilmis Fatih Sari Aslihan Usumez

The purpose of this study was to evaluate the effect of polishing procedures on the color stability of different types of composites after aging. Forty disk-shaped specimens (Ø10×2 mm) were prepared for each composite resin type (an ormocer, a packable, a nanohybrid, and a microhybrid) for a total of 160 specimens. Each composite group was divided into four subgroups according to polishing meth...

2004
L. Yin K. Ramesh Y. M. S. Wan X. D. Liu H. Huang

This report shares the feasibility study results of abrasive flow polishing of microbores of size φ500 μm or smaller and 25∼50 in aspect ratio for both metal and ceramic materials. A polishing device was designed and built up so as to create enough turbulence for facilitating the polishing at the inner walls of the micro-bore. Polishing of micro-bores on 3 materials: S45C, SS304 and Zr2O3 of le...

2016
Zhang Su Zheng Ying

Polishing technology is a final surface finishing process. The main aim is the removal of the machining marks to make the surface bright and clean. Polishing is often difficult to realize automatic mechanical polishing due to the polishing quality requirements and workpiece shape. Aiming at the problem, an automatic polishing technology has been proposed. In the paper, a new polishing path dete...

2016
Brisa dos Santos Leite Nathalia Carolina Fernandes Fagundes Mônica Lídia Castro Aragón Carmen Gilda Barroso Tavares Dias David Normando

INTRODUCTION Debris buildup on the bracket-wire interface can influence friction. Cleansing brackets with air-powder polishing can affect this process. OBJECTIVE The aim of this study was to evaluate the frictional force and amount of debris remaining on orthodontic brackets subjected to prophylaxis with air-powder polishing. METHODS Frictional force and debris buildup on the surface of 28 ...

2015

aim: Discolouration of direct composite resin restoration poses a significant aesthetic problem. This study compares the staining capacities of various beverages on direct composite materials, and compares the stain removing abilities of in-office bleaching using 38% Hydrogen Peroxide (Opalescence Boost) and re-polishing with Sof-Lex polishing system (3M ESPE). Materials & Methods: 180 composit...

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