Deck 5: Development of Teeth

Question 1

Odontoblasts are derived from which type of cell?

A) Follicular
B) Neural crest
C) Ectodermal
D) Oral epithelial

Answer 1

Neural crest

Question 2

Ameloblasts secrete enamel before odontoblasts secrete predentin.

Answer 2

False

Question 3

Tomes processes develop in which stage of ameloblast differentiation?

A) Secretion
B) Protection
C) Maturation
D) Organization

Answer 3

Secretion

Question 4

Bone,dentin,cementum and enamel grow through incremental deposition.

Question 5

After the enamel organ differentiates,the dental lamina begins to __________.

A) divide
B) reform
C) expand
D) degenerate

Question 6

The successional lamina is vital to the development of primary teeth.

Question 7

Which layer of the enamel organ is most closely associated with blood vessels?

A) Stellate reticulum
B) Stratum intermedium
C) Inner enamel epithelium
D) Outer enamel epithelium

Question 8

Predentin calcifies to form dentin within ____ hours.

A) 12
B) 24
C) 48
D) 72

Question 9

The primary cuticle is best defined as which of the following?

A) Mineralized, mature enamel
B) A cell junction complex, which attaches one ameloblast to another
C) An organic substance secreted on the surface of enamel by ameloblasts
D) An unmineralized protein secreted by ameloblasts in a young enamel matrix

Question 10

Which cells of the enamel organ assist ameloblasts in forming enamel?

A) Stellate reticulum
B) Stratum intermedium
C) Inner enamel epithelial
D) Outer enamel epithelial

Question 11

Which permanent tooth forms from the general lamina?

A) Molar
B) Incisor
C) Canine
D) Premolar

Question 12

During root development,the epithelial diaphragm __________.

A) fuses to the stratum intermedium
B) surrounds the apical opening of the dental pulp
C) forms the cortical plate, which covers the mandible
D) deposits an enamel matrix along the dentoenamel junction

Question 13

Accessory root canals connect the __________.

A) cementum with the enamel
B) pulp with the periodontal ligament
C) dentin with the alveolar bone proper
D) enamel with the junctional epithelium

Question 14

Which sequence reflects the correct order of appearance?

A) Predentin, ameloblasts, enamel, odontoblasts
B) Ameloblasts, enamel, odontoblasts, predentin
C) Ameloblasts, odontoblasts, predentin, enamel
D) Odontoblasts, enamel, ameloblasts, predentin

Question 15

Precursor odontoblast cells use cell signaling to determine the correct starting position.

Question 16

________ operates as a blueprint or pattern to guide root formation.

A) Predentin
B) The primary cuticle
C) Reduced enamel epithelium
D) Hertwig's epithelial root sheath

Question 17

Which tissue does not support the dentition?

A) Enamel
B) Cementum
C) Alveolar bone
D) Periodontal ligament

Question 18

Which two cellular layers fuse to form the root sheath?

A) Ameloblast and odontoblast cells
B) Cementoid and epithelial rest cells
C) Inner and outer enamel epithelial cells
D) Stratum intermedium and stellate reticulum cells

Question 19

The term reduced enamel epithelium is best defined as which of the following?

A) Noncalcified cementum
B) Material deposited by odontoblasts in response to trauma
C) Fused layer of ameloblasts, enamel epithelium, and stratum intermedium
D) Layer of outer root sheath cells that disperse into small clusters around the root

Question 20

The stages of tooth development occur in which order?

A) Bud, cap, bell
B) Bell, bud, cap
C) Cap, bell, bud
D) Bud, bell, cap

Question 21

The periodontal ligament attaches which two surfaces?

Question 22

Cementoblasts,fibroblasts,and osteoblasts originate from dental follicular cells.

Question 23

Enamel develops from __________ cells,whereas dentin develops from ___________ cells.

Question 24

Compact bone is the most highly calcified tissue in the human body.

Question 25

Tooth development relies on an interaction between the ectoderm and mesenchyme.

Question 26

________ ________ is a genetic disorder that makes teeth susceptible to excessive wear.

Question 27

The root lengthens more rapidly than the tooth erupts.

Question 28

List the five functional stages of change that each ameloblasts undergoes,in sequential order.

Question 29

_________ bone forms between the roots of multirooted teeth.

Question 30

Primary teeth begin development at birth.

Question 31

The terminal bar apparatus is a series of hemidesmosomes.

Question 32

A patient with oligodontia is congenitally missing more than six permanent teeth.