Effect of Repeated Firings and Thickness on Optical Properties of Variable Preshaded and Shaded Novel Translucent Zirconia Blocks

Table 4

Mean values and multiple comparison for different number of firings, block types, shade types, and sample thicknesses.

Block	Shade type	Thickness	1st firing	3rd firing	5th firing
XT	Preshaded	0.5 mm	^Aa	^Ba	^Ca
		1 mm	^Ab	^Bb	^Bb
		1.5 mm	^Ac	^Bc	^Cc
	Shaded	0.5 mm	^Ad	^Bd	^Cd
		1 mm	^Ab	^Be	^Ab
		1.5 mm	^Ac	^Bc	^Ac
ST	Preshaded	0.5 mm	^Aa	^Ba	^Aa
		1 mm	^Ab	^Bb	^Cb
		1.5 mm	^Ac	^Bc	^Bc
	Shaded	0.5 mm	^Ad	^Bd	^Cd
		1 mm	^Ab	^Bb	^Ce
		1.5 mm	^Ac	^Bc	^Bc
HT	Preshaded	0.5 mm	^Aa	^Ba	^Aa
		1 mm	^Ab	^Bb	^Bb
		1.5 mm	^Ac	^Bc	^Ac
	Shaded	0.5 mm	^Aa	^Bd	^Cd
		1 mm	^Ad	^Be	^Ce
		1.5 mm	^Ae	^Bc	^Ac

Average values with the same letter do not differ significantly from each other. Capital letters indicate significant differences between firing numbers (); lowercase letters indicate differences between staining and sample thicknesses ().