Resins for crown and bridge have been widely used as veneers on rnetal frames to provide restorations of anterior teeth because the reproducibility of the aesthetics appearances is relative}y easyi-6), The reason would be that their materials have good handling, such as an arbitrary working time and short setting time due to the light-curing system, and also have the advantage of comparatively ...

Modern Society is strongly dependent on a reliable power supply. The availability of cheap and reliable supply of electrical energy is an indicator of societal welfare. Uninterrupted reliable operation of a modern power system depends to a great extent on reliable and satisfactory performance of insulators under different environmental conditions. This paper reports result of natural pollution ...

This paper presents the experimental results of comparison between leakage currents and discharge currents. The leakage currents were obtained on polluted porcelain insulator. Whereas, the discharge currents were obtained on lightly artificial polluted porcelain specimen. The conducted measurements were leakage current or discharge current and applied voltage. The insulator or specimen was in a...

Computer-aided tooth shade determination of the natural tooth is an emerging application area which is still in development. Selecting the correct porcelain type is the key to repair teeth successfully. But the color and shade determined by human observers could not achieve a satisfied result because of the effect of the surrounding light and the limit of human eyes. And the computer-aided toot...

A laser photoacoustic technique has been developed to evaluate the surface acoustic wave (SAW) velocity of porcelain. A Q-switched Nd:YAG laser at 1064 nm was focused by a cylindrical lens to initiate broadband SAW impulses, which were detected by an optical fiber interferometer with high spatial resolution. Multiple near-field surface acoustic waves were observed on the sample surface at vario...

The objectives were to analyze the oxide layer generated between titanium and porcelain during firing and compare it in different manufacturing techniques: cast, milled and EBM-technique. Seventy two specimens were manufactured, subdivided according to surface treatment: time of passivation (P) and no time of passivation (NP) before porcelain firing. Specimens from each group were analyzed with...