. 2010 Mar-Apr;18(2):110–115. doi: 10.1590/S1678-77572010000200003

Table 2. Mean hardness values (VHN) (standard deviation) for the bottom surface of the resin cement specimens varying the curing light source and thickness of the indirect resin disks.

Resin diskt hickness (mm)	Light Source	Bottom^*	% Difference Compared to 1 mm	% Difference^ by curing light source and thickness**
1.0	QTH	19.1 (4.54)^b	-	67.5%
1.0	LED	32.0 (3.28)ª	-	67.5%
2.0	QTH	11.4 (4.67)^b	-40.3%	0.87%
2.0	LED	11.5 (1.84)^b	-64.1%	0.87%
3.0	QTH	5.8 (1.60)^b	-69.6%	29.3%
3.0	LED	7.5 (0.88)^b	-76.6%	29.3%

The same superscripted letters indicate no significant differences (p > 0.05).

^**

Absolute difference in mean VHN/ mean QTH VHN.