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Figure 5: Atomic force microscopy images of a representative sample from Group 1A (10% phosphoric acid etchant at 7 s). (a) 20 μm × 20 μm surface area of the etched primary dentin showing depth of − 1.3 μm and height of 1.1 μm from the surface. (b-d) Image of the sample along the X, Y and Z axes respectively showing the partial opening of dentinal tubules and flat surface of the intertubular dentin

Figure 5: Atomic force microscopy images of a representative sample from Group 1A (10% phosphoric acid etchant at 7 s). (a) 20 μm × 20 μm surface area of the etched primary dentin showing depth of − 1.3 μm and height of 1.1 μm from the surface. (b-d) Image of the sample along the X, Y and Z axes respectively showing the partial opening of dentinal tubules and flat surface of the intertubular dentin