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Figure 6: Atomic force microscopy images of a representative sample from Group 1B (10% phosphoric acid etchant at 15 s). (a) 20 μm × 20 μm surface area of the etched primary dentin showing depth of − 1.5 μm and height of 1.0 μm from the surface. (b-d) Image of the sample along the X, Y and Z axes respectively showing the near complete opening of dentinal tubules with exposed odontoblastic process and flat surface of intertubular dentin

Figure 6: Atomic force microscopy images of a representative sample from Group 1B (10% phosphoric acid etchant at 15 s). (a) 20 μm × 20 μm surface area of the etched primary dentin showing depth of − 1.5 μm and height of 1.0 μm from the surface. (b-d) Image of the sample along the X, Y and Z axes respectively showing the near complete opening of dentinal tubules with exposed odontoblastic process and flat surface of intertubular dentin