OBJECTIVES To evaluate the effect of different ultrasonic tip designs on intraradicular post removal. MATERIALS AND METHODS The crowns of forty human canine teeth were removed, and after biomechanical preparation and filling, the roots were embedded in acrylic resin blocks. The post spaces were made, and root canal molding was performed with self-cured acrylic resin. After casting (Cu-Al), th...

Rat embryos were explanted on late 11 day of gestation and cultured for 24 hours in rotating bottles with the yolk sac opened. Rat serum was used as culture medium and culture bottles were filled with 5% CO2 + 95% O2 gas mixture as gas phase. At the time of explantation and the end of the culture period, differentiation and growth of the embryos were monitored by counting somites and measuring ...

The maximum measured electric fields in thunderclouds are an order of magnitude less than the fields required for electric breakdown of the air. One explanation for lightning initiation in these low fields is that electric breakdown first occurs at the surfaces of raindrops where the ambient field is enhanced very locally due to the drop geometry . Laboratory experiments [Crabb & Latham, 1974] ...

Purpose To investigate narrow, elongated magnetically focused proton beams and compare their properties with passively collimated beams using Monte Carlo simulation. METHODS We performed Geant4 Monte Carlo simulations involving a single quadrapole focusing magnet, thereby creating a flattened beam with an elongated elliptical cross section. The parameters of the magnet were chosen to mimic k=...

purpose : the first report of electroretinographic changes following the intravitreal injection of carboplatin in a patient with retinoblastoma case report : recurrent tumors after chemoreduction and adjunctive local treatment in a case of familial unilateral retinoblastoma, group c, was treated with intravitreal carboplatin (10 µg) injections. results : the tumor was regressed after 3 injectio...

Phyllis Barber's new work, The Precarious Walk: Essays from Sand and Sky, spans immense time. book carries the reader childhood in post–World War II Nevada through adolescence, multiple marriages, children, relocation, ecological change, alterations faith, unfathomable loss, return. ambitious scope of works part because essays are less narrative memoir than they reflections on ideas sensations....

We examine the effect of surfactants on the evolution of the shape of an initially nonspherical drop translating in an otherwise quiescent fluid at low Reynolds number. A combination of the boundary-integral method and a finite-difference scheme is used to solve the coupled fluid dynamics and surfactant transport problems, in conjunction with the Frumkin adsorption framework to account for the ...

Diamond single crystals showing Infra-red features of pressurized CO2-I phase were studied using Transmission Electron Microscopy (TEM) and tomography. Numerous O-containing precipitates with sizes up to 45 nm are observed. The absolute majority these decorate dislocation loops or located inside them; individual scattered also present. Morphology the varies from quasi-isometric octahedra highly...