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

Table 4

Mean and standard deviations of surface hardness reduction ratios (HR%) after 7^th day (T1-T2) and after 14^th day (T1-T2) for all tested composite resins.

Resin composites ()	Initial (T1)-7^th day deviation	Initial (T1)-14^th day deviation
Omnichroma
Charisma Diamond One
Vittra Unique
Neo Spectra
A’CHORD
Nova Compo C