Research Article

Dentin Morphology of Root Canal Surface: A Quantitative Evaluation Based on a Scanning Electronic Microscopy Study

Figure 5

High magnification microphotograph analysis shows a higher number of secondary tubules access cavities in coronal zone than (a) in the middle (b) and apical (c) ones. In Figure (c) the Pa1 is 3.362 μm and it represents the external diameter while the Pa2 is 1.152 μm and it represents the diameter of the internal portion of the tubule.