Elsevier chapter 5 Qs oral histology and embryology

Mesenchymal

What cells form the dental papilla in the early tooth development?

Bud

What is the initial stage of early tooth development?

Oligodontia

Which genetic tooth abnormality is characterized by more than 6 congenitally missing teeth?

Third molars

What are the last teeth to develop?

Dentinal follicle

What tissue surrounds the embryonic pulp in the "cap" stage of tooth development?

Ameloblasts

These cells form enamel.

C. They organize a network of capillaries to support ameloblast cells

Outer enamel epithelial (OEE) cells of the enamel organ serve which function? A) they develop the alveolar bone. B) they form the collagen matrix for the dentin of the tooth. C) they organize a network of capillaries to support ameloblasts. D) they cover the ends of the dentinal tubules to seal the root surface.

10%

Predentin is composed of ——% non-collagenous protein.

B. Densely packed cells

What characterizes the dental papilla? A) star-shaped cells. B) densely packed cells. C) numerous desmosomes. D) elongated cellular process.

Secretion

The short conical processes called Tomes's processes develop during what stage of amelogenesis? A) secretion. B) protection. C) maturation. D) Morphogenesis.

Desmosomes

Ameloblasts are fastened to the stratum intermedium by:

A) enamelin

B) amelogenin

C) desmosomes

D) hemidesmosomes

5%

What percentage of enamel is water?

Water and enamelin

What two substances are removed to increase the mineral content of enamel?

Ameloblasts and stratum intermedium

What two cellular layers fuse to form the reduced enamel epithelium?

Interradicular

——————— bone forms between the roots of multirooted teeth.

B. Apical region

The highest fibre turnover in the periodontal ligament occurs in the:

A) furcation

B) apical region

C) middle region

D) cervical region

Bell stage

Dentinogenesis occurs during what stage of tooth formation?

Cusp tips

The initial site of dentin formation is at the: