All of the following is true about dentinal tubules except______________?

Correct answer: B. The diameter of dentin tubules ranges from 5 to 7μm

A. Inner pulpal layer contains more dentinal tubules than outer dentin layer
B. The diameter of dentin tubules ranges from 5 to 7μm
C. The diameter of dentinal tubule is more at pulpal layer than outer layer
D. The bonding is more on the inner layer of dentin compared to outer surface

Explanation

Dentinal tubules are generally about 1 to 3 micrometres wide near the pulp, not 5 to 7 micrometres. They are more numerous and wider in inner dentin, which also makes bonding and fluid movement greater there than in outer dentin.

Submitted by a TestUstad contributor and published by the TestUstad editorial teamLast updated 18 September 2026

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