Oral histology and embryology elsevier Qs chapter 6

Pre eruptive phase, pre functional eruptive phase, functional eruptive phase

What are the 3 phases of tooth eruption?

1. Root formation, 2. Movement to reach oral mucosa, 3. Penetration of the tip of the crown into oral cavity, 4. Intraoral or Incisal movement until contact with opposing crown.

What a re the 4 major events during the pre functional eruptive phase?

Resorption

Deciduous teeth are shed for what fundamental reason?

Mixed

A 10 year old is in ————— dentition. The ————— dentition period is from 8 to 12 years of age.

Mandibular molars

These teeth develop with occlusal surfaces slanting mesially.

Ankloglosed teeth

——————— teeth are associated with failed eruption. This is when the cementum of the root fuses with he alveolar bone proper.

Functional eruptive

Occlusal wear of the enamel is considered part of the ——————— eruptive phase.

Penetration

The crown enters the oral cavity in what eruptive event?

Osteoclasts

The resorptive process of primary and permanent teeth results from the action of the ——————— that arise from monocytes in the circulating blood stream.

Fibroblasts

What cells ingest collagen fibres?

Gubernaculum dentis

The _________________ guides tooth movement along the eruption pathway

D. Mineral is separated from the collagen fibres and broken into small pieces

Which occurs in the extracellular phase of hard tissue resorption?

A) Collagen fibers are ingested by fibroblast cells.

B) Mineral resorption occurs at the ruffled border of the osteoclast.

C) Crystals are digested in the cytoplasmic vacuoles of the osteoclast.

D) Mineral is separated from the collagen and broken into small pieces.

Macrophages

——————— appear in the eruption pathway during the pre functional eruptive phase.

Max canine

What tooth root is the last to be completed?

Primary

Is the coronal pulp larger in primary teeth or permanent?

12

There are —— accessional teeth in the human dentition.