True about direction of enamel rods______________?

Enamel 26/08/2021

A. They originate at right angle to dentin surface
B. They are almost vertical near the incisal edge (or) cusp tip areas
C. In the cervical third of deciduous crowns they are almost horizontal in direction
D. In cervical region of permanent teeth, they deviate in apical direction
E. All of the above

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    Ratio of diameter of enamel rods in the DEJ to the enamel surface is______________?
    A. 1:4 B. 1:1 C. 1:2 D. 2:1...
    Interwining of the enamel rods at the cusp timps and the incisal edges of a tooth is called______________?
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    Incremental lines of Retzius appear_____________?
    A. As lines in the enamel running at right angles to the enamel surface B. As lines in the dentin running at right angles to the dentino-enamel junction C. In enamel and follow the apposition pattern D. In dentin and follow the appositional pattern...
    All are true about the striae of retzius except___________?
    A. Constitute the rest lines with in the enamel rods B. Have high inorganic content C. They are areas of increased porosity D. Allow the movement of water and small ions...
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