Daily mcqs test

Dentinogenesis – MCQ Test

1. Dentinogenesis begins at:

Cervical loop Root apex Cusp tips CEJ

2. Cells responsible for dentin formation are:

Ameloblasts Cementoblasts Fibroblasts Odontoblasts

3. Unmineralized dentin matrix is called:

Interglobular dentin Predentin Sclerotic dentin Secondary dentin

4. Major organic component of predentin:

Type II collagen Type I collagen Type III collagen Elastin

5. Mineralization of predentin starts after:

Immediately 6 hours 24 hours 72 hours

6. Initial daily rate of dentin formation is:

1 µm/day 2 µm/day 4 µm/day 10 µm/day

7. Daily incremental lines in dentin:

Lines of Retzius Lines of von Ebner Owen’s lines Neonatal line

8. Accentuated incremental lines are:

Perikymata Lines of Retzius Contour lines of Owen Neonatal lines

9. Odontoblastic process is called:

Sharpey’s fibers Tomes’ fibers Korff’s fibers von Ebner fibers

10. Protein that binds calcium in dentin mineralization:

Amelogenin Osteocalcin Dentin phosphoprotein Fibronectin

11. Root dentin compared to coronal dentin is:

Faster & highly mineralized Slower & less mineralized Same rate Not formed

12. Secondary dentin forms:

Before eruption After root completion During crown formation Only in caries

13. Tertiary dentin is formed due to:

Aging Normal function Caries or trauma Root elongation

14. Dentinal tubules in crown show:

Straight course Spiral S-shaped course Circular pattern

15. Dentinogenesis is a:

Single-phase process Two-phase process Three-phase process Cyclic process