Calcification of roots of decidous teeth is completed by_____________?

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. Calcification of all teeth except last molars are completed by____________?

   A. 2 years
   B. 4 years
   C. 6 years
   D. 8 years

3. 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

4. Pulp chambers and roots canals in decidous teeth______________?

   A. Wide and deep
   B. Shallow and narrow
   C. Wide and narrow
   D. Shallow and wide

5. The deciduous teeth can be differentiated from permanent teeth by_____________?

   A. Enamel prismatic arrangement
   B. Dentinal tubule arrangement
   C. Primary and secondary dentin
   D. Mineral content

6. A child has 12 permanent and 12 decidous teeth, what is his age____________?

   A. 8½ years
   B. 11½ years
   C. 4½ years
   D. 13½ years

7. Which of the following is true about calcification of teeth ?

   A. Calcification of primary teeth is almost complete at time of birth
   B. Calcification of all primary teeth and few permanent teeth complete at birth
   C. Calcification of all permanent teeth complete at birth
   D. Calcification of primary teeth starts around birth

8. The first evidence of calcification of primary anterior teeth begins approximately between ______________?

   A. 14 to 17 weeks in utero
   B. 9 to 12 weeks in utero
   C. 6- to 9 weeks in utero
   D. 17 to 20 weeks in utero

9. A 20yr old patient reports with multiple swelling of the jaws. Clinical examination reveals multiple hard swellings involving the jaws and intra orally several missing teeth are noticed. Panoramic radiograph reveals multiple radio opaque lesions in the maxilla and the mandible with multiple impacted teeth and supernumerary teeth indicative of Gardeners syndrome: The above mentioned condition is______________?

   A. Autosomal dominant disease
   B. Autosomal recessive disorder
   C. X-linked disease
   D. A syndrome of unknown cause

10. 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