Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

Table 3

Mean, standard error, and critical value as measured by the Tukey test for the flexural strength values of the interaction between “storage medium” and “time” of HCR group (MPa).

	24 hours	30 days	60 days	90 days	120 days
AIR	94.2 (a); A	75.1 (a); A	73.7 (a); A	72.0 (a); A	70.7 (a); A
WATER	90.4 (a); A	77.8 (a); A	74.2 (a); A	72.6 (a); A	71.5 (a); A
MINERAL OIL	86.3 (a); A	77.6 (a); A	74.7 (a); A	74.1 (a); A	71.4 (a); A
standard error = 5,67

Critical value of 5% = 27.51. Horizontal, lowercase letters (same material, different storage conditions). Vertical, capital letters (same storage condition, different materials).