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

Table 9

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

	BASELINE; AIR	120 DAYS; DISTILLED WATER	120 DAYS; MINERAL OIL
HCR	94.2 (a); (A)	71.5 (a); (A)	71.4 (a); (A)
NCR	105.6 (a); (A)	28.9 (b); (B)	56.4 (b); (A)
SBCR	61.2 (a); (B)	49.9 (a); (AB)	54.4 (a); (A)
Standard error = 8,50

Critical value of 5% = 38.33. Horizontal, lowercase letters (same material, different storage conditions). Vertical, capital letters (same storage condition, different materials).