Influence of alumina addition on the optical property of zirconia/alumina composite dental ceramics

Abstract

The influence of various alumina additions on the optical property of zirconia/alumina composite ceramics was investigated. The relative sintered densities, transmittances, color and the microstructure of the composite ceramics were studied. The experimental results showed that the relative sintered densities and transmittances decreased with alumina addition. The lightness increased obviously but the chroma change was small. Pure zirconia nanopowders sintered densely could obtain the relatively high transmittance, while the transmittance and the lightness of slight addition changed signifi cantly. The zirconia/ alumina composite ceramics with alumina addition less than 7.5wt% could achieve the relatively stable and reliable optical properties.

Mechanical properties–translucency–microstructure relationships in commercial monolayer and multilayer monolithic zirconia ceramics

“…influences the microstructure and retards the hydrothermal degradation of Y-TZP without compromising its mechanical properties [25]. However, Al2O3 can drastically decrease the translucency of zirconia ceramics [25][26][27], in agreement with the lowest TP observed in this study for GC ST that revealed the highest Al2O3 amount (0.36 wt%). As expected, a small amount of HfO2 (<5 wt%) was identified in all investigated zirconia grades.…”