Table 4.

Comparison between the properties of some aluminum oxide and zirconium oxide products [48, 74–76].

	Alumina		Zirconia
	Procera™ AllCeram	In-Ceram AL	VITA In-Ceram® YZ	Lava™ Frame Zirconia
Main component	Al2O3	Al2O3	5Y-TZP	3Y-TZP
Fracture toughness (MPa·m1/2)	3.50-4.90	5.52-5.70	5.90	3.50-4.50
Vickers hardness (GPa)	17.90-18.90	12.65-13.43	12.65-13.43	—
Modulus of elasticity (GPa)	—	—	200-210	200-210
Fracture strength (N)	784.80-1953.50	—	665-2374
Indications	Single crown	Single-crown and three-unit bridges for anterior teeth	Single-crown and three-unit anterior and posterior bridges	Single crown, multiunit bridges, inlay bridges, and full-zirconia crowns