Which of the following statements about dentinal tubules is INCORRECT?

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The inner pulpal region has a higher density of dentinal tubules than the outer dentin area.Dentinal tubules have a diameter between 5 and 7 micrometers.The tubule diameter is larger near the pulp compared to the outer dentin layer.Bonding strength is greater on the inner dentin layer than on the outer surface.

Explanation

The diameter of dentinal tubules is actually much smaller than 5 to 7 micrometers; it typically ranges from about 0.5 to 2 micrometers. The other statements are true: the inner pulpal region contains more tubules, tubule diameter increases closer to the pulp, and bonding is stronger on the inner dentin.