Table 1 . The Descriptive Statistics and the Results of Statistical Analysis for Comparison of Microhardness Values Among the Experimental Groups .

	Mean	SD	Pairwise Comparison *
Group 1	708.92	73.43	a, b
Group 2	742.89	108.64	a
Group 3	679.13	80.69	b, c
Group 4	655.32	93.14	b, c
Statistical analysis	P<0.001

*Tukey pairwise comparison test; Different letters indicate statistically significant differences at P<0.05.