The Fisher Improved Electro Analyzer facilitates since it is a self-contained unit that operates directly rapid quantitative determinations of metallic ele-from a 110 volt. 60 cycle, A.C. line. This instruments in solutions. It eliminates the need for ex-ment is also an efficient source of power for elec-pensive, cumbersome motor generators and rheostats, trolytic polishing, charging storage ba...

Objective: The purpose of this study was to investigate the surface finish of 5 different aesthetic restorative materials after polishing with 3 different polishing systems. Materials and Method: The materials included 2 nano-filled composites (Tetric Evo Ceram and Grandio), a compomer (Compoglass F), a resin-modified glass ionomer cement (Fuji II LC), and a highly viscous glass-ionomer cement ...

AIM To determine whether anterior capsule polishing during cataract surgery done by phacoemulsification has any effect on the rate of posterior capsule opacification. MATERIALS AND METHODS We conducted a 3 year retrospective analytical study at our hospital. The medical records of patients who underwent cataract extraction by phacoemulsification with foldable square edge hydrophilic PCIOL bet...

This paper reports ductile or partial ductile mode machining of silicon, glass and some advanced ceramics. Results are presented using scanning electron micrographs of the machined surfaces. Grinding and lapping operations using inexpensive machine tools could produce ductile streaks on surfaces of these brittle materials under good conditions. Manufacture of spherical glass lenses by the fract...

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 ...

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...

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...

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...

In this paper, a mathematical model of leakage sound propagation through a heat exchanger tubes array in boilers is established, which is based on the Twersky’s sound scattering theory, transmission grating diffraction theory, Fabry-Perot’s interference principle, and algebraic iteration method. The tubes array is made up of large number periodically arranged tubes immersed in air. Its acoustic...