Development of the dentitions

Which of the following pairs of movements predominate during the post-eruptive period?

• Distal and lingual.

• Axial and mesial.

• Distal and axial.

• Axial and rotational.

Passive eruption is:

• Growth in the length of the root.

• Apical migration of the junctional epithelium.

• Deposition of bone at the fundus.

• The formation of cellular cementum.

Which of the following does not occur during the eruptive phase?

• Dentin deposition.

• Narrowing of apical foramen.

• Increased thickness of cementum.

• Enamel formation.

During the pre-eruptive phase of tooth eruption:

• Cementoblasts begin to secrete cementoid.

• The apical foramen is beginning to close.

• The developed tooth at the bell stage lies within a crypt of bone.

• The root is formed.

Which of the following occurs during the pre-eruptive stage of eruption of a tooth:

• Differentiation of the stratum intermedium.

• Formation of the dental sac.

• Formation of stellate reticulum.

• Maturation of enamel.

Active eruption of the tooth:

• Begins as soon as the roots have begun to develop.

• Begins when the apical cementum is deposited on the roots of the tooth.

• Begins as the occlusal tip starts moving towards the occlusal plane

• Continues until exposure of the cementum has occurred.

The root formation theory of eruption proposes, that eruption is due to the push of the:

• Expanding pulp in the root canals against the alveolar crypt.

• Elongating roots against the base of the alveolar crypt.

• Elongating roots against the Hammock ligament.

• Proliferating periodontal ligament.

Actual eruptive movements of tooth occur mainly in a :

• Horizontal direction.

• Complex pattern.

• Axial direction.

• Rotational direction.

Which of the following does not occur in the active phase of tooth eruption:

• Organization of a periodontal ligament from the dental follicle.

• Gradual separation of attachment epithelium from the enamel surface.

• Root formation.

• Occlusal wear.

The most likely factor responsible for tooth eruption is:

• Lymphatic pressure.

• The developing periodontal ligament.

• Bone growth.

• The growing enamel.