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 4

Post hoc comparison between groups based on shear bond strength of Co-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	−6.39	0.62279	−8.07	−4.71	0.001
Group 1	Group 3	−19.21		−20.89	−17.54	0.001
Group 1	Group 4	−10.39		−12.06	−8.71	0.001
Group 2	Group 3	−12.82		−14.5	−11.14	0.001
Group 2	Group 4	−3.99		−5.67	−2.31	0.001
Group 3	Group 4	8.82		7.15	10.5	0.001

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