TABLE 2.

MOE and Poisson’s ratio of enamel, dentin, and various restoration materials.

	Young’s modulus (GPa)	Poisson’s ratio	Tensile stress δTS (Mpa)	Fracture toughness KIC (Mpa·m1/2)	Strain energy release rate G (J/m2)
Enamel	83.5	0.27	11.5	3.1	115.1
Dentin	18.6	0.31	41.3	2.2	260
Pulp	2	0.45	—	—	—
Zirconia	206.5	0.259	865	5	121.1
Lithium disilicate (LDS)	103	0.215	210	2.27	50
Hybrid polymer-infiltrated ceramic network material (PIC)	38.08	0.233	148	1.2	37.8
Filling composite resin (Filtek Z350)	9.8	0.25	—	—	—