INBDE (Integrated National Board Dental Examination) Practice Exam

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What runs obliquely from DEJ to the enamel surface?

  1. Dental Tubules

  2. Odontoblasts

  3. Striae of Retzius

  4. Lamellae

The correct answer is: Striae of Retzius

The structure that runs obliquely from the Dentinoenamel Junction (DEJ) to the enamel surface is the Striae of Retzius. The Striae of Retzius are incremental growth lines in enamel that reflect the pattern of enamel matrix secretion during tooth development. They appear as concentric lines on a histologic section of enamel and are responsible for the formation of perikymata on the external enamel surface. Option A, Dental Tubules, are tiny channels that run from the pulp to the DEJ but do not extend to the enamel surface. Option B, Odontoblasts, are cells that line the pulp cavity and produce dentin, but they do not run obliquely from the DEJ to the enamel surface. Option D, Lamellae, are thin, calcified layers within the enamel, but they do not run obliquely from the DEJ to the enamel surface like the Striae of Retzius do.

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