Root completion of the mandibular first molar takes place by the age_______________?

Related Mcqs:

1. The permanent mandibular second molar differs from the permanent mandibular first molar in number of ______________?

   A. Cusps
   B. Roots
   C. Lingual grooves
   D. Marginal ridges

2. When viewed occlusally, a primary mandibular second molar closely resembles which of the following mandibular teeth ?

   A. Permanent second molar
   B. Permanent first molar
   C. Second premolar
   D. Primary first molar

3. 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

4. In normal occlusion , with which grooves / surface of the permanent mandibular first molar does the mesiobuccal cusp of the permanent maxillary first molar occlude______________?

   A. Distobuccal groove
   B. Mesial surface
   C. Mesiobuccal surface
   D. Transverse groove

5. The root trunk of permanent mandibular first molar buccally is______________?

   A. Equal is length to the mesial bifurcation of the maxillary first molar
   B. Equal is length to the buccal bifurcation of the maxillary first molar
   C. equal in length to the crown
   D. None of the above

6. According to Schour & Massler the crown completion of both permanent maxillary and mandibular first molars is________________?

   A. 1½ 2 years
   B. 2½ – 3 years
   C. 3-4 years
   D. 3-5 years

7. A radiograph of 4- years old child reveals no evidence of calcification of mandibular second pre molar. This indicates______________?

   A. It is too early to make final predication
   B. The teeth may develop later
   C. Primary second molar extracted to allow mesial drifting of permanent first molar
   D. The child may never develop premolars

8. Difference between mandibular and maxillary premolars is that in the mandibular premolars ?

   A. The buccal and lingual cusps are more prominent
   B. The lingual cusp is sharper and longer
   C. The lingual surface rounded and less developed
   D. The buccal surface is rounded and less developed

9. The root completion of permanent teeth is achieved after __________ years o eruption?

   A. 1-1½
   B. 2-3
   C. 3-4
   D. 4-5

10. The time taken for primary tooth root completion after eruption_____________?

    A. 3 years
    B. 1 years
    C. 2 years
    D. 1 month