Table 2: Comparison of Change in Raand Wear Depth (µm) Between Groups

Groups Change Ra Median# [Range, Interquartile Range] Wear Depth Median# [Range, Interquartile Range]
CaCO3 Groups
CaCO3 control 0.16 A.,a [0.55, 0.17] 5.84 A.,a [13.41, 4.77]
CaCO3 immediate 0.30 B.,b[0.46, 0.13] 9.09 B.,a [8.23, 2.71]
CaCO3 after 1h 0.27 B.,c[0.80, 0.11] 9.08 B.,a [19.32, 5.65]
SiO2 Groups
SiO2 control 0.18 A.,a [0.72, 0.24] 10.45 A.,b [16.14, 6.94]
SiO2 immediate  0.31B.,b [0.62, 0.29] 8.66 A.,a [15.14, 9.09]
SiO2 after 1h 0.28 B.,c [0.47, 0.21] 12.4 A.,a [26.16, 8.87]

24 enamel blocks/group#Median followed by distinct superscript capital letters show statistically significant difference within each group (CaCO3 group; SiO2 group), and those with lower letters among groups (CaCO3 and SiO2 groups) (p < 0.05).