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. 2012 Sep-Oct;20(5):576–580. doi: 10.1590/S1678-77572012000500014

Table 3.

Hardness ratios (standard deviations) of composite resin specimens light cured with light curing units covered with layers of an infection control barrier

LCU Control 1 Layer 2 Layers 4 Layers 8 Layers
FL2 89.8 (2.0)Aa 88.2 (5.1)Aba 84.5 (6.0)Aba 83.4 (5.3)Ba 76.4 (5.7)Ca
O360 80.0 (5.2)Ab 76.1 (4.4)Abb 72.0 (5.2)BCb 66.9 (4.7)Cb 65.6 (6.2)Cb

Values having the same capital letters in the rows and the same small letters in the columns are not statistically significant (p>0.05). LCU= light curing unit; FL2= Elipar FreeLight 2; O360= Optilux 360