The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?

Related Mcqs:

1. During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?

   A. More negative
   B. Less negative
   C. Positive
   D. Equal to the intra alveolar pressure

2. The hertwig’s epithelial root shealth is essential to development of the root because it_______________?

   A. Gives rise to cementoblasts that produce cementum of the root
   B. Moulds the shape of roots and stimulates differentiation of odontoblasts
   C. Given rise to odontoblasts that lay down dentin of the root
   D. Remians as an essential constituents of the periodontal ligament

3. At the cemento enamel junction, which of the following occurs_____________?

   A. Cementum meets enamel
   B. Cementum overlaps enamel
   C. Cementum does not meet enamel
   D. All of the above

4. Dentino enamel junction is_________________?

   A. Non-scalloped
   B. Straight
   C. Scalloped and the convexities are directed towards dentin
   D. Scalloped and the convexities are directed towards enamel

5. The dentin adjacent to the dentinoenamel junction is called the______________?

   A. Mantle dentin
   B. Circumpulpal dentin
   C. Predentin
   D. Secondary dentin

6. In adult teeth, the type of dentin present underlying dentin-enamel junction is_______________?

   A. Predentin
   B. Mantle dentin
   C. Interglobular dentin
   D. Tertiary dentin

7. The neuromuscular transmitter released at neuromuscular junction is_______________?

   A. Dopamine
   B. Epinephrine
   C. Nor epinephrine
   D. Acetylcholine

8. A histologic evidence of widespread formation of globular hypocalcified dentin and pulp horns reaching the dentinoenamel junction, absence of lamina dura around the tooth in radiograph are the characteristic features of_____________?

   A. Vitamin -D resistant rickets
   B. Hypophosphatasia
   C. Hypervitaminosis-A
   D. Vitamin-A deficiency

9. The corrct order of microscopic zones of dentinal caries starting from the D.E junction is_______________?

   A. Zone of sclerosis, decalcification zone, bacterial invasion
   B. Bacterial invasion, decalcification zone, zone of sclerosis
   C. Zone of sclerosis, backterial invasion, decalcification zone
   D. Decalcification zone, zone of scierosis, backterial invasion

10. The cyst which is found within the bone at the junction of teh globular process, the lateral nasal process & maxillary process is______________?

    A. Naso-alveolar cyst
    B. Globulomaxillary cyst
    C. Naso palatine cyst
    D. Mid palatine cyst