401. Tooth eruption is due to______________?

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

402. In resorption of roots of the primary teeth, the dental pulp_____________?

A. Plays a passive role
B. Becomes a fibrotic non-vital mass
C. Initiates resorption from the inner surface of roots
D. Aids in formation of secondary dentin slowing down resorption

403. Concrescence is:
A. An extra root or accessory roots in a formed tooth.
B. Distorted root or roots in a formed tooth.
C. A union of root structure of two or more teeth through cementum only.
D. A spherical projection on the cemental root surface.

404. What structure is formed in the crown first?
A. Enamel.
B. Cementum.
C. Pulp.
D. Dentine.

405. Which of the following induces the dental papilla cells to be differentiated into odontoblasts?
A. Stratum intermedium.
B. Reduced enamel epithelium.
C. Inner enamel epithelium.
D. Outer enamel epithelium.

406. No basal lamina is found between the cells of the:
A. Stratum intermedium and inner enamel epithelium.
B. Outer enamel epithelium and the dental sac.
C. Inner layer of Hertwig’s sheath and the dental papilla.
D. Inner enamel epithelium and the dental papilla.

407. Which of the following is not a functional activity of the enamel organ:
A. Inducing the differentiation of Odontoblasts.
B. Secretion of enamel matrix.
C. Maturation of enamel.
D. Formation of cementum.

408. Which of the following is not derived from the dental organ:
A. Stellate reticulum.
B.Hertwig’s epithelial root sheath.
C. Odontoblasts.
D.Ameloblasts.

409. The stratum intermedium:
A. Induces dentin formation.
B. Is separated from the stellate reticulum by a basal lamina.
C. Develops in cap stage.
D. Is important for enamel maturation.

410. The dental organ
A. Develops from cells in the dental follicle.
B. Is a completely connective tissue structure.
C. Is a completely epithelial structure.
D. Is highly vascular, as ameloblasts require an enriched environment.

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