Dentinal tubule diameter at the DEJ is ____ um

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Study for the Biocompatibility of Dental Materials Test. Prepare with multiple choice questions and detailed explanations to ensure you're ready for your exam!

Multiple Choice

Dentinal tubule diameter at the DEJ is ____ um

Explanation:
Dentinal tubule diameter decreases as you move from the pulp toward the dentinoenamel junction, so the outermost dentin near the DEJ has the smallest tubules. At the DEJ the diameter is about 0.5 μm. This small size, reinforced by highly mineralized peritubular dentin around each tubule, limits fluid movement and diffusion toward the enamel, helping protect the pulp. Tubules are wider closer to the pulp—around 1–2 μm or more—so larger values like 2.5 μm or 5.0 μm would fit nearer the pulp or atypically large tubules, not at the DEJ.

Dentinal tubule diameter decreases as you move from the pulp toward the dentinoenamel junction, so the outermost dentin near the DEJ has the smallest tubules. At the DEJ the diameter is about 0.5 μm. This small size, reinforced by highly mineralized peritubular dentin around each tubule, limits fluid movement and diffusion toward the enamel, helping protect the pulp. Tubules are wider closer to the pulp—around 1–2 μm or more—so larger values like 2.5 μm or 5.0 μm would fit nearer the pulp or atypically large tubules, not at the DEJ.

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