521. Which of the following pairs of movements predominate during the post-eruptive period?
A. Distal and lingual.
B. Axial and mesial.
C. Distal and axial.
D. Axial and rotational.

522. Passive eruption is:
A. Growth in the length of the root.
B. Apical migration of the junctional epithelium.
C. Deposition of bone at the fundus.
D. The formation of cellular cementum.

523. Which of the following does not occur during the eruptive phase?
A.Dentin deposition.
B.Narrowing of apical foramen.
C.Increased thickness of cementum.
D. Enamel formation.

524.During the pre-eruptive phase of tooth eruption:
A.Cementoblasts begin to secrete cementoid.
B.The apical foramen is beginning to close.
C.The developed tooth at the bell stage lies within a crypt of bone.
D.The root is formed.

525. Which of the following occurs during the pre-eruptive stage of eruption of a tooth:
A. Differentiation of the stratum intermedium.
B. Formation of the dental sac.
C. Formation of stellate reticulum.
D. Maturation of enamel.

526. Active eruption of the tooth:
A. Begins as soon as the roots have begun to develop.
B. Begins when the apical cementum is deposited on the roots of the tooth.
C. Begins as the occlusal tip starts moving towards the occlusal plane.
D. Continues until exposure of the cementum has occurred.

527. The root formation theory of eruption proposes, that eruption is due to
the push of the:
A. Expanding pulp in the root canals against the alveolar crypt.
B. Elongating roots against the base of the alveolar crypt.
C. Elongating roots against the Hammock ligament.
D. Proliferating periodontal ligament.

528. Actual eruptive movements of tooth occur mainly in a :
A. Horizontal direction.
B.Complex pattern.
C. Axial direction.
D. Rotational direction.

529. Which of the following does not occur in the active phase of tooth eruption:
A.Organization of a periodontal ligament from the dental follicle.
B. Gradual separation of attachment epithelium from the enamel surface.
C. Root formation.
D. Occlusal wear.

530. The most likely factor responsible for tooth eruption is:
A. Vascular pressure.
B. The developing periodontal ligament.
C. Bone growth.
D. The growing root.

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