Sample of Exam Questions

• المقرر الدراسي: 253 DDS

QUESTION 1
The dental lamina is induced to proliferate into a tooth bud by the

1. Basement membrane
2. Epithelial nerves
3. ecto mesenchyme
4. oral epithelium

QUESTION 2
What statement regarding the epithelial diaphragm is NOT true?

1. its plane remains horizontal during root formation
2. after dentine formation it's cells differentiate into cementoblasts.
3. it's growing tip is located coronally
4. it maintains a fixed distance from the basal part of the adjacent alveolar bone.

QUESTION 3
The reduced enamel epithelium joins with which layer to form Nasmyth's membrane?

1. enamel cuticle
2. enamel lemellae
3. enamel pellicle
4. oral epithelium

QUESTION 4
What process will not be associated with the primary tooth during exfoliation?

1. odontoclastic resorption of roots
2. odontoblastic repair of roots
3. development of the gubernacular canal
4. osteoclastic resorption of the inter-radicular septum.

QUESTION 5
Which of the following pairs of word regarding hard tissue genesis is mismatched?

1. dentine - mesoderm
2. enamel - ectoderm
3. bone - mesoderm
4. cementum - ectoderm

QUESTION 6
Prismless Enamel

1. is less mineralized than prismatic enamel.
2. is found only in the cervical area of permanent teeth
3. is harder than prismatic enamel
4. two of the above are correct

QUESTION 7
Dentine tubules

1. provide a pathway for unmyelinated nerve axons to the ADJ
2. are surrounded by a ring of hypomineralized peritublar dentine
3. always follow a straight course to the ADJ
4. contain processes that may extend into enamel as enamel spindles

QUESTION 8
Which cell is in greatest abundance in the tooth pulp?

1. odontoblasts
2. fibroblasts
3. lymphoid wandering cells
4. histocytes
5. reserve ce