Evaluation of Zirconia Surfaces after Strong-Acid Etching and Its Effects on the Shear Bond Strength of Dental Resin Cement

Table 3

Mean, standard deviation (SD), standard error (SE), and 95% confidence interval (CI) of each of the four groups according to surface treatment when using Rely-X U200 resin cement (MPa) or using Panavia F 2.0^† resin cement (MPa).

	Group		Mean	SD	SE	95% CI
						Min.	Max.
Rely-X U200	ET15	11	13.8^a	2.8	0.9	11.9	15.7
	ET30	11	12.2^a	4.9	1.5	8.9	15.6
	Ab	11	3.9^b	2.1	0.6	2.5	5.3
	ABET	11	13.3^a	4.3	1.3	10.4	16.9
	Total	44	10.8	5.4	0.8	9.1	12.4
Panavia F 2.0^†	ET15	11	9.7^i	2.5	0.8	8	11.4
	ET30	11	6.1^ii	1.2	0.4	5.2	6.9
	AB	11	4.5^ii	1.5	0.5	3.5	5.5
	ABET	11	11.2^i	3.1	0.9	9.1	13.2
	Total	44	7.9	3.5	0.5	6.8	8.9

3M ESPE, St. Paul, MN, USA; ^†Kuraray, Kurashiki, Okayama, Japan; ET15, etched for 15 min; ET30, etched for 30 min; AB, airborne-particle abrasion; ABET, airborne-particle abrasion followed by etching for 15 min. Superscript letters “a” and “b” indicate statistically significant differences from each other and also for i and ii ().