Exam 22: Eruption and Shedding of Teeth

Supraeruption can cause serious problems in the replacement of the missing tooth because it makes it difficult to reestablish the normal occlusal plane.

The reduced enamel epithelium and the oral epithelium fuse into the united oral epithelium.

Tooth eruption is dependent on the dental sac because this structure plays a role in the formation of cementum,the periodontal ligament,and alveolar bone.

The primary tooth is able to erupt because the gubernacular canal breaks down bone between the tooth and the surface oral epithelium.

The successional lamina is seen only facial/buccal to the anterior primary teeth because the permanent anteriors erupt slightly lingual to their primary counterparts,while the permanent posterior teeth lie below the primary and erupt through their established alveolus.

Supraeruption is

The direction of tooth eruption is facial and apical.

In spatial movement,the crown develops while the tooth socket fills in with bone.

Vascular pressures in the periodontium seem to disrupt eruption because the pulsating blood pressures interfere with cellular activity.

During the eruptive stage the reduced enamel epithelium fuses with the dental follicle to create an eruptive force.The eruptive stage continues until the erupting teeth meet the opposing arch.

Which structure acts as a "shock absorber" during the eruption process?

In eccentric growth the crown of a tooth grows in a perfectly symmetrical pattern because all areas grow proportionately as the crown enlarges.

The eruptive movement that pushes the crown of the tooth directly toward the surface is called eccentric movement.Eccentric movement occurs during the eruptive stage.

Each of the following has a role in tooth eruption EXCEPT for one.Which one is the EXCEPTION?

Deciduous ankylosis occurs when

In the pre-eruptive stage,all of the following occur EXCEPT one.Which one is the EXCEPTION?

Each of the following typically occurs with retained root tips EXCEPT one.Which one is the EXCEPTION?

As the permanent teeth become surrounded by bone,the successional lamina forms small openings in the alveolar bone,known as

During the pre-eruptive stage bone is in a U-shaped crypt.When the root forms,osteoclasts may deepen the crypt.

The united epithelium is broken down by enzymatic action of Hertwig's root sheath.Upon breakdown of this epithelium the tooth emerges into the oral cavity.