Fig 1.
Representative diagrammatic images of an unpolished and polished enamel sample with the 5 scan areas for the central cluster and 20 scan areas for the peripheral cluster mapped out separately.
A representative baseline scan image for the central cluster and peripheral cluster are also shown for each sample.
Fig 2.
Representative SEM images before erosion.
(A) Central polished enamel sample (B) Central unpolished enamel (both 1100 X magnification).
Fig 3.
Boxplot of median (IQR) Sa roughness results of unpolished and polished enamel before and after erosion measuring 5 areas in a central cluster.
1 = unpolished enamel before erosion, 2 = unpolished enamel after erosion, 3 = polished enamel before erosion and 4 = polished enamel after erosion.
Fig 4.
Representative SEM images after erosion.
(A) Central polished enamel sample (B) Peripheral polished enamel (C) Central unpolished enamel and (D) peripheral unpolished enamel (all 1100 X magnification).