Deck 5: Development of Teeth

Question 1

The periodontal ligament attaches which two surfaces?

A) Alveolar bone and cementum
B) Alveolar bone and enamel
C) Cementum and attached gingiva
D) Cementum and free gingiva

Answer 1

A

Question 2

Tomes processes develop in which stage of ameloblast differentiation?

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

Answer 2

A

Question 3

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

Answer 3

C

Question 4

Which of the following best defines the primary cuticle?

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 5

Enamel forms from which type of cells?

A) Ectoderm
B) Mesoderm
C) Endoderm
D) Dental papilla

Question 6

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 7

Which tissue does not support the dentition?

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

Question 8

Which of the following best defines the term reduced enamel epithelium?

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 9

Which permanent tooth forms from the general lamina?

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

Question 10

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

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

Question 11

Which type of bone forms between the roots of multirooted teeth?

A) Alveolar bone proper
B) Lamina dura
C) Haverisan bone
D) Interradicular

Question 12

Odontoblasts are derived from which type of cell?

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

Question 13

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 14

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 15

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 16

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 17

Predentin calcifies to form dentin within ____ hours.

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

Question 18

________ 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 19

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 20

Which is a genetic disorder that makes teeth susceptible to excessive wear?

A) Cleft lip
B) Cleft palate
C) Dentinogenesis imperfecta
D) Thyroglossal duct cyst

Question 21

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

Question 22

The root lengthens more rapidly than the tooth erupts.

Question 23

Which is the first functional stage of change that each ameloblast undergoes?

A) Secretion
B) Maturation
C) Morphogenesis
D) Organization and differentiation

Question 24

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

Question 25

Ameloblasts secrete enamel before odontoblasts secrete predentin.

Question 26

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

Question 27

The terminal bar apparatus is a series of hemidesmosomes.

Question 28

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

Question 29

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

Question 30

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

Question 31

Primary teeth begin development at birth.

Question 32

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