Enamel is laid down______________?

Related Mcqs:

1. 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

2. Temporary structures in enamel organ are (before enamel formation) ?

   A. Enamel knot
   B. Enamel cord
   C. Both A and B
   D. Enamel Cuticle

3. Smooth surface caries is characterized by spread of caries in enamel and dentin as cones. These alignment in enamel and dentin is____________?

   A. Base to base
   B. Apex to base
   C. Apex to apex
   D. None of the above

4. Nutrition for ameloblasts after 1st layer of enamel is laid is______________?

   A. Dental sac
   B. Odontoblastic process
   C. Ree
   D. Dental Papilla

5. Specific gravity of enamel is_____________?

   A. 2.8
   B. 3.8
   C. 4.8
   D. 2.3

6. Enamel rods at the cervical area at the occlusal edge and incisal lip in permanent teeth are______________?

   A. Straight
   B. Shallow
   C. Bent
   D. Curved

7. The thickness of prismless enamel in diciduous teeth is______________?

   A. 25 μ m
   B. 50 μ m
   C. 75 μ m
   D. 100 μ m

8. The percentage of inorganic matter in fully developed enamel is about____________?

   A. 66%
   B. 76%
   C. 86%
   D. 96%

9. True about direction of enamel rods______________?

   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

10. The shallow furrows on the enamel surface, where stria of Retzius end are known as _______________ ?

    A. Cracks
    B. Pellicle
    C. perikymata
    D. Enamel lamellae