No one should have any objections against the claim that the diamond crystal, the most precious gem polished usually with the brilliant cut, casts a spell on us by its stunning beauty. The beauty would be more enhanced and its emotional appeal would be raised to rational one if we would explore the microscopic structure, say the periodic arrangement of carbon atoms, which is actually responsibl...

The effect of glazing on the mechanical properties monolithic high translucent zirconia is widely used to fabricate highly aesthetic and strong dental restorations using CAD-CAM technology. purpose this study was evaluate surface roughness different brands' materials Zirconia. 40 specimens from Zirconia block (VITA YZ®XT Color, Diameter 98.4x14mm height) were prepared by computer-aided design/c...

Dental ceramics is a highly esthetic material and its surface properties can impact roughness, bonding properties, as well strength wear. The aim of the study to analyze characteristics by determination roughness parameters three dental used in computer-aided design/computer-aided manufacturing (CAD/CAM) technique: lithium disilicate (LS2), zirconium oxide-reinforced silicate (ZLS), oxide (ZrO2...

tiles and tilework has developed in islamic civilization based on pre-islamic iranian art and then spread out from spain to central asia. herein, iran has played an individual role among different islamic countries and remnants of various tileworks across this wide territory are clear evidences to this claim. among different species of tiles and tile decorations, we face with specific types of ...

A one-dimensionalmathematical model is developed describing ice growth due to supercooled  uid impacting on a solid substrate. When rime ice forms, the ice thickness is determined by a simple mass balance. The leadingorder temperature proŽ le through the ice is then obtained as a function of time, the ambient conditions, and the ice thickness. When glaze ice forms, the energy equation and mass...