In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the_____________?

Related Mcqs:

1. The last primary tooth to be replaced by a permanent tooth is usually the_____________?

   A. Maxillary second molar
   B. Mandibular second molar
   C. Maxillary canine
   D. Mandibular canine

2. 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

3. Tooth eruption is due to______________?

   A. Osteoclastic activity
   B. Proliferation of cells at crypt
   C. Exforliation of primary tooth
   D. Eruptive force

4. Movement of tooth to close the intermaxillary gap during eruption is due to____________?

   A. Physiological tooth migration
   B. Active eruption
   C. Passive eruption
   D. None of the above

5. The most accepted theory of tooth eruption is____________?

   A. Hydrodynamic theory
   B. Clone theory
   C. Periodontal ligament traction theory
   D. Vascular theory

6. The maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ________ μm/day?

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

7. Calcification of permanent first molar usually begins in the_____________?

   A. Third month of intrauterine life
   B. In the sixth month of intrauterine life
   C. At birth
   D. In the third month of extra uterine life

8. Beginning of eruption of permanent tooth starts_____________?

   A. After completion of root
   B. When apical third root is still to be formed
   C. When half of the root is still to be formed
   D. when root formation starts

9. A disease which only affects the formation and eruption of tooth but does not cause hypoplasia is______________?

   A. Hypoparathyroidism
   B. Hyperthyroidism
   C. Rickets
   D. Syphilis

10. The first permanent tooth to erupt in the oral cavity is the_____________?

    A. Mandibular central incisor
    B. Mandibular first molar
    C. Maxillary central incisor
    D. Maxillary first molar