An In Vitro Study on the Shear Bond Strength of Feldspathic Porcelain to Nickel Chromium Alloy and Cobalt Chromium Alloy after Various Surface Treatments

Table 2

Post hoc comparison between groups based on shear bond strength of Ni-Cr alloy samples using post hoc Tukey’s tests.

Group		Mean difference	Standard error	95% confidence interval		value
				Lower bound	Upper bound
Group 1	Group 2	−5.18	0.54719	−6.65	−3.7	0.001
Group 1	Group 3	−18.42		−19.89	−16.95	0.001
Group 1	Group 4	−9.39		−10.86	−7.91	0.001
Group 2	Group 3	−13.24		−14.71	−11.77	0.001
Group 2	Group 4	−4.21		−5.68	−2.73	0.001
Group 3	Group 4	9.03		7.55	10.5	0.001

, significant; , highly significant; , very highly significant; , not significant.