Which of the following statements about the orientation of enamel rods is correct?

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Enamel rods begin perpendicular to the dentin surface.Near the incisal edges or cusp tips, enamel rods are nearly vertical.In the cervical third of primary teeth crowns, enamel rods run almost horizontally.In the cervical area of permanent teeth, enamel rods tilt towards the apex.All of the above statements are true.

Explanation

Enamel rods start at a right angle to the dentin surface, are nearly vertical close to the incisal edges or cusp tips, run almost horizontally in the cervical third of deciduous crowns, and in the cervical region of permanent teeth, they incline towards the apex. Therefore, all the listed statements are accurate.