Is Deterioration of Surface Properties of Resin Composites Affected by Filler Size?

Table 2

Mean (SD) of gloss of all material tested before and after tooth-brushing abrasion of 20,000 cycles.

Material	Gloss (initial)	Gloss (after tooth-brushing abrasion)
Sp	80.90 (0.70)^a	51.10 (0.44)^a
I1	76.50 (0.52)^b	23.40 (0.39)^b
I2	75.95 (0.52)^b,e	16.90 (0.48)^c
I3	74.03 (0.22)^c	8.68 (0.63)^d
I4	72.30 (0.29)^d	5.85 (0.33)^e
I5	75.18 (0.34)^e	14.70 (0.56)^f
I6	72.73 (0.46)^d	11.98 (0.59)^g
TC	84.30 (0.47)^f	61.33 (1.10)^h

Within each column, similar superscripts indicate no significant difference (). Within each group, represent significant differences before and after tooth-brushing abrasion.