background and aims. current chemical methods may not efficiently disinfect dental stone casts. the aim of this study was to investigate if microwave irradiation is effective for disinfection of stone casts. materials and methods. in this laboratory study, three groups (n = 162) of prepared spherical stone beads as carriers with a diameter of 10 mm were inoculated by separately soaking in three...

PURPOSE To compare two different impression techniques for implants in totally edentulous patients. MATERIALS AND METHODS A total of 38 patients had impressions taken both using plaster and splinted vinyl polysiloxane (splinted-VPS). Two casts per patient were generated and allocated as test (plaster) and control (splinted-VPS) cast groups according to a randomised cross-over design. One of t...

The effectiveness of rotary degassing on the defect formation and mechanical properties final casting aluminium alloy EN AC 46000 was investigated, along with its impact energy consumption in furnace. In melt preparation prior to casting, molten metal is usually transported from melting furnace as a cleaning procedure. Under conditions this specific study, negligible degradation observed cast c...

GaN nanostructure was Synthesized using Pulsed laser ablation in liquid ethanol with Nd:YAG at pulsed energy of 1600 mj and wavelength 1064 nm. The nanoparticle deposited the drop cast method on prepared porous silicon substrate. structural optical properties were studied. XRD pattern shows a high sharp peak pSi 2θ =28.74 reflected from (111) plane exhibits h-GaN rise =34.54, =37.49, 2θ= 48.19 ...

The phase inversion technique was used to produce polyaniline (PAn) actuators with different geometries that cannot be obtained by PAn cast from N-methyl-2-pyrrolidinone (NMP) solution in a conventional way. PAn was cast and coagulated in a water bath forming films and tubes with or without a platinum (Pt) wire helix as an interconnect. PAn was doped with hydrochloric solution (HCl, 1 M) (PAn/H...

AIM The aim of this study was to determine the wettability of different hydrophilic and hydrophobic elastomeric impression materials and the gypsum castability. MATERIALS AND METHODS The wettability was evaluated by determining the contact angles of different elastomeric impression materials. The contact angle was determined by placing a drop of aqueous solution of calcium sulfate dihydrate o...

We report the phase behaviour of polymer/fullerene/solvent ternary mixtures and its consequence for the morphology of the resulting composite thin films. We focus particularly on solutions of polystyrene (PS), C60 fullerene and toluene, which are examined by static and dynamic light scattering, and films obtained from various solution ages and thermal annealing conditions, using atomic force an...

An investigation of the friction and sliding wear of gray cast iron against chromium plated cast irons was carried out on a newly constructed reciprocating friction and wear tester. The tests were the first to be done on the test rig under dry conditions and at the speed of 170 cm/min, and variable loads of 20-260 N for a duration of 15 min. to 3 hours. The gray cast iron surfaces worn by a pro...