. Author manuscript; available in PMC: 2016 Nov 1.

Published in final edited form as: Dent Mater. 2015 Sep 11;31(11):1304–1311. doi: 10.1016/j.dental.2015.08.161

Table 2.

Mean (standard-deviation) for interfacial fracture energy G_C [N/m].

	Z-SB	GZ-SB	GZ-E	P-SB	P-E
Baseline	16.1 (3.9)^D	42.3 (11.4)^C	47.6 (20.6)^BC	75.1 (24.9)^A	75.7 (13.4)^A
Aged	8.4 (3.3)^E	71.1 (5.5)^A	70.8 (16.0)^AB	74.5 (8.6)^A	54.6 (11.1)^ABC

The abbreviations are denoted as follows. Z: zirconia, GZ: graded zirconia, P: feldspathic ceramic, SB: sandblasted, and E: chemically etched. Distinct superscript letters indicate significant difference among groups.