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. 2014 Jun;15(2):74–80.

Table 2.

Mean fracture toughness (MPa. m0.5) and standard deviations (±) of the materials  (n = 8)

Materials 24 Hours Distilled Water 21 Days Distilled Water 21 Days Carbamide Peroxide
Rok a0.75 ±(0.07)A b0.67 ±(0.07)A b0.64 ±(0.08)A
Esthet a0.59±(0.05)B a0.58±(0.09)B b0.66±(0.05)A
Estelite a0.50±(0.03)B b0.46±(0.03)C a0.50±(0.03)B

Means with the same upper-case letter in each column are not significantly different (p> 0.05).

Means with the same lower-case letter in each row are not significantly different (p> 0.05).