2. Histological Structure of Enamel - Dr. Fathy Emad

Histological Structures of Enamel

1 / 10

The formation of the enamel matrix between two short increments needs:

Four days.

One day.

Three drays.

Two days.

2 / 10

The dentinoenamel junction (DEJ) :

Appears to be scalloped with convexities of the scallops directed to E.

Appears to be scalloped with convexities of the scallops directed to cementum.

Appears to be scalloped with convexities of the scallops directed to D.

Non of the above.

3 / 10

Hypomineralized structures which extend from the D.E.J to the surface of the Enamel are called:

Hunter schreger bands.

E. spindle.

Incremental lines of Retzius.

Enamel lamellae.

4 / 10

Incremental lines are a result of variation in:

Rhythmic apposition.

Histodifferentiation.

c) Morphodifferentiation.

Proliferation.

5 / 10

Neonatal lines are present in:

Permanent canines.

All deciduous & first permanent molar.

Premolars.

All permanent teeth.

6 / 10

Hunter-Schreger bands are:

found in the outer surface of enamel.

best visualized in transverse section of the crown.

reflect periodic changes in prism direction of enamel.

run parallel to the striae of Retzius.

7 / 10

The striae of Retzius:

Are not seen in the cuspal one third of the enamel.

Are parallel to the enamel rods.

Would be seen as concentric rings in a horizontal section of the crown.

Are parallel to the surface of the enamel in the cervical region.

8 / 10

The quality of the prenatal Enamel:

Is not as better as that of the postnatal E.

Is equal to the quality of postnatal E.

Is better than that of the postnatal E.

Not related to the quality of postnatal E.

9 / 10

Which of the following is not a feature of enamel?

Perikymata.

Cross striations.

Prism sheath.

Contour lines of Owen.

10 / 10

Incremental lines of Retzius form grooves on the surface of the enamel termed:

Gnarled enamel.

Perikymata.

Enamel cuticle

Neonatal lines.

Your score is