objectives : because of poor bond between resin cement and zirconia ceramics, laser surface treatments have been suggested to improve adhesion. the present study evaluated the effect of co 2 and nd:yag lasers on the shear bond strength (sbs) of resin cement to zirconia ceramic. materials and methods : ninety zirconia disks (6×2 mm) were randomly divided into six groups of 15. in the control gro...

The optical qualities of cutting-edge aesthetic dental ceramics are crucial for great aesthetics and may be impacted by various bleaching methods. objectives this study were to evaluate how home affected the translucency parameter (TP), contrast ratio (CR), total color difference (?E), surface roughness (Ra) ceramics, including innovative ultra-translucent zirconia. three varieties that tested—...

ID No: FC-169 ABSTRACT The continuous fiber reinforced self-healing ceramic composites (shFRC) were proposed as one of the candidate materials for turbine blade [1]. The shFRC consists of three components, which are oxide fiber bundle, oxide matrix and self-healing agent interlayer. As the self-healing is generated at only the interlayer, it is necessary that crack propagation is led into the i...

Abstract In this investigation, surface modification toughening of partially stabilized zirconia ceramics, by sub-eutectoid solution annealing, has been performed. The Zr 0.918 Mg 0.068 Y 0.014 O 1.925 designated (MZY) was prepared mixing Magnesia Partially Stabilized Zirconia (MZ9) and Yttria Tetragonal (TZ3Y) Polycrystal commercial powders using wet ball milling. mechanical properties microst...

Ceramics are easy to break, and very few generic mechanisms available for improving their mechanical properties, e.g., the 1975-discovered anti-fracture mechanism is strictly limited zirconia hafnia. Here we report a general achieving high plasticity through liquefaction of ceramics. We further disclose material design strategies achieve this difficult task entropy-boosted amorphous ceramics (E...

The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and compos...

This study was focused on the experimental investigations about mechanical characteristics and tribological mechanisms of nanometric zirconia dental ceramics. A universal mechanical testing machine was used to test the threepoint flexural strength and the fracture toughness. A microhardness tester was used to test the Vickers hardness of the test specimens. An MRH-3 digital-display high-speed r...

INTRODUCTION Alumina ceramics have long been of technological importance. However, their brittleness limits their potential for use in structural applications. Traditional approaches proposed to improve the strength and reliability of ceramics include: decrease flaw size, improve fracture toughness and flaw insensitivity, and decrease applied stresses. Polymers on the other hand, although weak,...

Densification and grain growth mechanisms of Yttria-Stabilized Zirconia sintered by Spark Plasma Sintering are investigated. trajectories four commercial submicronic powders with different average particle sizes yttria amounts have been established sintering regimes determined. determined in the regime where densification is occurring without using a model derived from hot-pressing. Grain conve...

The possibility of using the "Brazilian test" method to determination tensile strength sigma t composite zirconia ceramics small-size samples were demonstrated and reliability obtained values confirmed. It was found that dependence alumina toughened (stabilized by calcium oxide) with silica addition (CaO-ATZ + SiO 2 ceramics) on concentration in them has a maximum (sigma_t=450...