The Effect of Gastric Acid on the Surface Properties of Different Universal Composites: A SEM Study

Table 2

Mean and standard deviations of surface roughness parameter for all tested composite resins.

Resin composites ()	Initial deviation	7^th day deviation	14^th day deviation
Omnichroma	^A	^b,B	^d,B	0.009
Charisma Diamond One	^C	^a,D	^c,D	0.009
Vittra Unique	^E	^b,F	^d,F	0.002
Neo Spectra	^G	^b,H	^d,H	0.003
A’CHORD	^J	^b,I	^d,I	0.011
Nova Compo C	^K	^a,L	^c,L	0.006

Capital letters refer to statistical groupings for each evaluated time (line), and small letters indicate significant difference in roughness parameter (column) ().