Effect of dopants and sintering temperature on microstructure and low temperature degradation of dental Y-TZP-zirconia

Effect of differences in coefficient of thermal expansion of veneer and Y-TZP ceramics on interface phase transformation

“…Tholey et al 23 explained the t/m phase transformation at the veneer-zirconia interface by the effect of the liquid required to produce veneering layers. Previous Raman studies did not reveal the presence of the phase transformation in the case of accelerated aging performed at a water-vapor pressure of 0.23 MPa and a temperature of 134 C for zirconia sintered at 1350 C. 37,38 Higher intensities of m peaks at the veneerframework interface for Y-TZP sintered at 1350 C can better be explained by the build-up of residual stresses created during the veneering process than by the occurrence of liquid at the interface. The extent of the t/m phase transformation observed along the veneerframework interface in this study was not homogeneous, which resulted in a heterogeneous stress distribution at the veneer-zirconia interface.…”

“…In addition, a CB sintered at low temperature (1350 C) has a smaller grain size than Y-TZP ceramics sintered at higher temperature, which results in a less-stressed structure. 37,38 The c phase of zirconia has only 1 active Raman mode, F 2g at 616 cm Future studies should concentrate on producing a veneer ceramic with a coefficient of thermal expansion closely matching that of zirconia to suppress the t/m phase transformation at the veneer-zirconia interface and improve the mechanical properties of ceramic dental restorations composed of a 2 Raman spectra of coping subjected to different treatments. Labels of individual spectra correspond to groups specified in Table I.…”

Translucency and low-temperature degradation of silica-doped zirconia: A pilot study

“…It is known that Y-TZP can degrade in a humid, low-temperature environment such as the oral cavity, when used there for long periods 9) . While conventional Y-TZP for frames contains a small amount of alumina to suppress degradation 10) , commercially available translucent Y-TZP used for full contour crowns has a reduced alumina content to improve translucency 11) . Therefore, translucent Y-TZP could be more subject to low-temperature degradation than conventional Y-TZP for frames 12) .…”

Effect of sintering temperature on microstructure and electrical properties of Sr1−x(Na0.5Bi0.5) x Bi2Nb2O9 solid solutions

“…Preparation condition, especially sintering temperature is an important factor in the fabrication process of ceramic bodies, which can significantly affect the mechanical and electrical properties of materials [1,2]. For improvement of these properties, parameters affected by sintering such as density, porosity, grain size and their distribution must be controlled [3,4]. In fact, sintering, as one of the most important processes for the production of ceramic materials, usually goes through a sequence of essential phenomena such as neck formation, pore, shrinkage, and grain growth.…”