Table 1.

Group distribution and material specification (n=10).

Group	CAD/CAM system	Ceramic system	Manufacturer	Ceramic system composition
CC	CEREC	In Coris Zi	Sirona Dental Systems, Bensheim, Germany	Zirconium dioxide + hafnium dioxide + yttrium trioxide >99 wt.%, aluminum trioxide <0.5 wt.%, others oxides <0.5 wt.%
CN	CERCON	Cercon base	Dentsply International, Susquehanna Commerce Center, York, USA	Yttrium trioxide 4.5–5.4 wt.%, hafnium dioxide <5 wt.%, aluminum trioxide <0.5 wt.%, silicon dioxide <0.1 wt.%, sodium oxide <0.1 wt.%, iron trioxide <0.1 wt.%, zirconium dioxide balance
CL	CERAMILL	Ceramill Zi	Amann Girrbach North America, Charlotte, USA	Zirconium dioxide + hafnium dioxide + yttrium trioxide >99 wt.%, yttrium trioxide 8.5–9.5 wt.%, hafnium dioxide <5 wt.%, aluminum trioxide <0.5 wt.%, other oxides <1 wt.%
LA	LAVA	Lava Frame Zirconia	3M, St. Paul, USA	Zirconium oxide 79–97%, yttrium oxide 3–15%, hafnium oxide <5%