Table 1.

Finite element results for the components of fracture energy and toughness for inner, middle and outer dentin.

Parameter	Region of Evaluation
	Inner	Middle	Outer
JelI	205	355	549
JtipII	2.4	9.2	21.2
JbridIII	77	128	192
JtotalIV	285	492	762
KcI	2.1	2.7	3.4
KeffIV	2.4	3.2	4.0

Units for J and K are Pa•m and MPa•m^1/2, respectively.

^IJ_el is the fracture energy estimated for linear elastic behavior and it is use to calculate K_c

^IIJ_tip accounts for the energy spent in plastic deformation

^IIIJ_brid is the energy stored in the spring elements

^IVJ_total is the total fracture energy and it is use to calculate K_eff