Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Table 1

Chemical composition, sintering conditions, and manufacturer of materials.

Material	Composition	Sintering temperature/time	Manufacturer
VITA YZ XT (preshaded+nonshaded)	ZrO2 (86-91%); Y2O3 (8-10%); HfO2 (1-3%); Al2O3 (0-1%); Pigments (0-1%)	1450°C/7 hours	VITA Zahnfabrik, Germany
VITA YZ ST (preshaded+nonshaded)	ZrO2 (88-93%); Y2O3 (6-8%); HfO2 (1-3%); Al2O3 (0-1%); Pigments (0-1%)	1530°C/4 hours	VITA Zahnfabrik, Germany
VITA YZ HT (preshaded+nonshaded)	ZrO2 (90-95%); Y2O3 (4-6%); HfO2 (1-3%); Al2O3 (0-1%); Pigments (0-1%)	1450°C/10 hours	VITA Zahnfabrik, Germany