The study was done to assess the sealing ability and adaptation of RealSeal 1, and to compare it with Thermafil. 65 single-rooted extracted teeth were selected and root canal treatment was performed. Root canals were obturated with RealSeal 1 or Thermafil. A double chamber bacterial leakage model using E. faecalis was developed to assess the sealing ability. Samples were monitored daily for 60 ...

An approach for reducing reverse-bias leakage currents in Schottky contacts formed to nitride semiconductor heterostructures grown by molecular-beam epitaxy is described, demonstrated, and analyzed. By incorporation of a GaN cap layer atop a conventional AlxGa1−xN/GaN heterostructure field-effect transistor epitaxial layer structure, the direction of the electric field at the metal-semiconducto...

OBJECTIVE To evaluate the gingival marginal seal in class II composite restorations using different restorative techniques. MATERIAL AND METHODS Class II box cavities were prepared in both proximal faces of 32 sound human third molars with gingival margins located in either enamel or dentin/cementum. Restorations were performed as follows: G1 (control): composite, conventional light curing te...

On-state gate leakage current behavior of AlGaN/GaN high electron mobility transistors (HEMTs) has been studied by using Technology Computer Aided Design (TCAD) simulation. We found the gate leakage current increases above the pinch-off voltage, which is different from the case of a two-terminal operation. This gate leakage current increase is due to self-heating effect at the gate edge of the ...

Static random access memory (SRAM) is the most commonly employed semiconductor in the design of on-chip processor memory. However, it is unlikely that the SRAM technology will have a cell size that will continue to scale below 45 nm, due to the leakage current that is caused by the quantum tunneling effect. Magnetic random access memory (MRAM) is a candidate technology to replace SRAM, assuming...

INTRODUCTION This study was carried out to evaluate the bacterial leakage of root canal fillings when cavity varnish containing 5% fluoride (Duraflur) was used as root canal sealer. METHODS AND MATERIALS Root canals of 88 straight single-rooted teeth were prepared. Eighty teeth were randomly divided into 3 experimental groups (n=20) and two positive and negative control groups of ten each. Th...

The role of cytochrome P450 (P450) in the cytotoxicity of mitomycin C (MMC) and Adriamycin (ADR) was investigated in freshly isolated hepatocytes from phenobarbital-induced rats. The loss of cell viability [measured as lactate dehydrogenase (LDH) leakage] upon MMC exposure was accompanied by a rapid and extensive intracellular glutathione (GSH) depletion and followed by minor lipid peroxidation...

This paper focuses on the discretisation of the hydrodynamic transport equations for electrons in sub-micron MOSFET structures. In particular initialisation of the electron temperature equation, and the important problem of accurately calculating the energy input term f J E j on a generalised triangular FE mesh will be considered. The discretisation is applied to the calculation of substrate le...

We have investigated the current-voltage characteristic of monolayers of seperated metal clusters of a size of 1.4 nm with a low-temperature ultrahigh vacuum scanning tunneling microscope. Apart from the usual charge-quantization phenomena, such as Coulomb blockade and staircase, negative differential resistance was observed by performing measurements at distinct locations on the cluster layers...

The present insight into plasmon effects on the nanoscale seems sufficiently advanced to allow the development of surface-plasmon-polariton- (SPP-) based optical devices. Therefore quantitative information describing SPP phenomena is required. We investigate a SPP beam splitter constituted by silver nanoparticles on a silver thin film, fabricated by electron-beam lithography. We acquire quantit...