Difference between primary and permanent enamel is_______________?

Related Mcqs:

1. While charting the dentition of a child, the pedodontist finds that the following teeth are present in all the four quadrants; permanent central incisor , permanent lateral incisor , decidous cuspid , decidous first molar, decidous 2nd molar and permanent 1st molar. The eruptive pattern may be considered most nearly normal for a child aged_____________?

   A. 3-6 years
   B. 7-10 years
   C. 11-14 years
   D. 15- 18 years

2. 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

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

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

4. 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

5. Roots of primary and secondary teeth are different in that the primary roots are more divergent and flaring. The other difference _____________?

   A. Primary roots show less a accessory and lateral canals
   B. Primary roots resorb more easily
   C. Primary roots are shorter
   D. None of the above

6. The striking difference between enamel and other mineralized tissues is______________?

   A. Presence of high percentage of organic matrix
   B. Presence of incremental lines
   C. Enamel has high reparative capacity
   D. Most of organic component is lost during mineralization

7. What is the thickness of the layer of primsless enamel found in primary teeth_____________?

   A. 25 μm
   B. 50μm
   C. 75μm
   D. 100μm

8. Among the difference between teeth in the decidous and the permanent dentition is that_____________?

   A. Buccal surfaces of the permanent molars are flatter
   B. Cervical ridges are more pronounced in permanent molars
   C. Root trunks of decidous teeth are larger compared with their overall root lengths
   D. Crowns of decidous incisors are wider mesiodistally than their cervico incisal lengths

9. Maxillary primary cuspid enamel completion takes place at______________?

   A. 6 months in utero
   B. 6 months after birth
   C. 9 months in utero
   D. 9 months after birth

10. 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