471.The development of the root begins when
A. The inner and outer dental epithelium reaching the future C.E.J.
B. The crown is completely formed.
C. The development of the supporting bone begins.
D. The development of the periodontal ligament begins.

472. The function of the inner dental epithelium is……..
A. Exerts organization influence on the dental papilla cells.
B. Lays down dentin matrix
C. Protects the enamel after eruption.
D. Provides the enamel organs with alkaline phosphatase

473.The tooth germ is composed of
A. Dental papilla, dental follicle, dental organ.
B. Dental follicle, dental lamina, vestibular lamina.
C. Dental papilla, dental lamina, dental organ.
D. Dental organ, dental follicle, dental lamina.

474.The apposition stage of tooth development begins
A. When the root of the tooth begins to develop.
B. When the first layer of dentine is deposited.
C. When odontoblast start to differentiate.
D. When the first layer of enamel lay down.

475. What statement about epithelial diaphragm is Not true?
A. It produces narrowing of the wide cervical opening.
B. Its proliferation is accompanied by proliferation of pulp cells
adjacent to diaphragm.
C. It’s growing end is located coronal to the root sheath.
D. It grows in a horizontal plane.

476. The cells of the stratum intermedium:
A. Have a stellate outline.
B. Are not yet differentiated in the bell stage.
C. Are in direct contact with the outer dental epithelium.
D. Are characterized by high alkaline phosphatase enzyme activity.

477. The dental follicle:
A. Is an epithelial structure.
B. Give rise to the radicular pulp.
C. Is not present in permanent teeth.
D. give rise to cementum.

478.If the process of morphogenesis is disturbed:
A. Changes will occur in the shape of crown and root.
B. Enamel formation will be abnormal.
C. Dentin formation will be abnormal.
D. Absence of cementum.

479. The mesenchymal cells lying adjacent to the inner enamel epithelium:
A. Differentiate into ameloblasts.
B. Differentiate into odontoblasts.
C. Are under the influence of stellate reticulum.
D. Become markedly folded.

480. The dental lamina:
A. Breaks at the cap stage.
B. Has no branching.
C. Has no remnants.
D. Develops from the oral epithelium.

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