Table 2. Multiple comparisons of groups by post-hoc Tukey tests for Vickers hardness. The mean difference is significant at the 0.05 level.

(I) group	(J) group	Mean difference (I-J)	Std. error	Sig.	95% Confidence Interval
					Lower bound	Upper bound
control	CPP	-106.79333	51.30682	.240	-250.4603	36.8736
	Laser	-217.19333*	51.30682	.001	-360.8603	-73.5264
	Laser+CPP	-66.86000	51.30682	.690	-210.5270	76.8070
	CPP+Laser	-6.39333	51.30682	1.000	-150.0603	137.2736
CPP	Laser	-110.40000	51.30682	.210	-254.0670	33.2670
	Laser+CPP	39.93333	51.30682	.936	-103.7336	183.6003
	CPP +Laser	100.40000	51.30682	.298	-43.2670	244.0670
Laser	Laser+CPP	150.33333*	51.30682	.036	6.6664	294.0003
	CPP +laser	210.80000*	51.30682	.001	67.1330	354.4670
Laser+ CPP	CPP +laser	60.46667	51.30682	.764	-83.2003	204.1336