431. The vestibular lamina gives rise to:
A. The alveolodental sulcus.
B. The alveolobuccal sulcus.
C. The alveololingual sulcus.
D. The alveologingival sulcus.

432. The ectomesenchymal cell condensation just beneath the enamel organ is called:
A. Dental sac.
B. Dental follicle.
C. pulp.
D. Dental papilla.

433. The cells of the tooth bud have:
A. High RNA content only.
B. Low glycogen content only.
C. Increased oxidative enzyme activity only.
D. All of the above.

434. Regulatory genes play a significant role in tooth development, they:
A. Control the tooth position.
B. Control the tooth number.
C. Determine the tooth shape.
D.a & b.

435. Initiation of dental lamina is induced by:
A. Neural crest cell.
B. Endoderm.
C. Ectoderm.
D. Mesoderm.

436. Primordium for the permanent dentition appears as an extension of dental lamina into the ectomesenchyme:
A. Lingual to the developing primary tooth germ.
B.Labial to the developing primary tooth germ.
C. Mesial to the developing primary tooth germ.
D. Distal to the developing primary tooth germ.

437. The region where the inner and outer enamel epithelium meets at the rim of the enamel organ is known as:
A. Zone of Flection.
B. Cervical loop.
C. Epithelial Diaphragm.
D. Root Sheath of Hertwing’s.

438. Which the followings is not a function of stellate reticulum:
A. Protection of the underlying dental tissues.
B. Maintenance of tooth shape.
C. Support the production of enamel.
D. Control the position & number of tooth germs.

439. The epithelial pearls are derived from:
A. Dental lamina.
B. Dental pulp.
C. Dental sac.
D. Dental organ.

440. Odontoblasts start their secretory activity:
A. Before enamel matrix production.
B. After enamel matrix production.
C. During enamel matrix production.
D. During & after enamel matrix production.

NOTE
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