Deck 6: Eruption and Shedding of Teeth

Question 1

Special _______ cells destroy collagen fibers by ingestion.

A) fibroblast
B) osteoclast
C) osteoblast
D) amino acid

Answer 1

A

Question 2

Final maturation of the periodontal ligament (PDL)fibers occurs

A) at the cap stage of tooth formation.
B) when the teeth first erupt through the gingiva.
C) when the teeth reach functional occlusion.
D) when the root is half formed.

Answer 2

C

Question 3

Which structure(s)increase(s)the surface area of the osteoclast?

A) Fibroblasts
B) Ruffled border
C) Periodontal fibers
D) Epithelial diagram

Answer 3

B

Question 4

Which permanent tooth develops without a primary predecessor?

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

Question 5

Why are humans considered to be diphyodonts?

A) Because they possess two dentitions.
B) Because the adult molars are intended for chewing plants.
C) Because the adult canines are pointed and have a single cusp.
D) Because the mesio-distal dimension of the adult premolars is less than that of the primary molars.

Question 6

Fusion of the tooth (reduced enamel epithelium)with the oral epithelium forms which type of connection?

A) Periodontal ligament
B) Junctional epithelium
C) Trabeculae
D) Fundic

Question 7

The ______ stage of tooth development contains permanent and primary teeth in various stages of formation.

A) preeruptive
B) mixed dentition
C) late prefunctional
D) functional eruptive

Question 8

How many teeth are in the primary dentition and how many teeth are in the permanent dentition?

A) 20 in primary;28 in permanent
B) 20 in primary;32 in permanent
C) 32 in primary;32 in permanent
D) 32 in primary;52 in permanent

Question 9

Tooth eruption requires formation of the eruption

A) ruffled border.
B) diphyodont.
C) pathway.
D) leeway space.

Question 10

Which of the following best defines ankylosis?

A) A fusion of tooth roots to the bony socket
B) A process that leads to tooth eruption
C) The removal of bone overlying the bony crypt
D) The eruption of a tooth into a space occupied by an opposing tooth

Question 11

Which of the following is the origin of osteoclasts?

A) Fibroblasts
B) Monocytes
C) Amino acids
D) Root resorption

Question 12

Which of the following is clinically seen as tooth eruption?

A) Light and dark bands
B) Interlocking of the rods
C) Blanching of the mucosa
D) Crystallization of the enamel rods

Question 13

Hard tissue resorption comprises which two phases?

A) Mineral and collagen phases
B) Prefunctional and functional phases
C) Extracellular and intracellular phases
D) Fibroblast eruptive and osteoclast functional phases

Question 14

The permanent teeth that replace the primary teeth are called ______.

A) supportive
B) accessional
C) overlapping
D) successional

Question 15

Which of the following defines the functional eruption phase?

A) The first phase of tooth eruption,which includes eruptive movements during crown formation
B) The final stage,which includes occlusal wear of the enamel
C) The process of initiation of root development into the oral cavity
D) The final stage,in which the teeth require adjustments relative to the bony crypt

Question 16

Which type of teeth are not successors of primary teeth?

A) Adult incisors
B) Adult canines
C) Adult premolars
D) Adult molars

Question 17

The mixed dentition phase occurs from approximately _____ years of age.

A) birth to 2
B) 3 to 6
C) 8 to 12
D) 13 to 18

Question 18

The reduced enamel epithelium fuses with the oral epithelium during prefunctional eruption.

Question 19

Which of the following occurs when root formation begins?

A) The epithelial root sheath proliferates.
B) The tooth's crown tip enters the oral cavity.
C) Fibrous tissue surrounding the follicle increases.
D) Reduced enamel epithelium contacts and fuses with the oral epithelium.

Question 20

The mesiodistal size difference between a primary molar and a permanent premolar is called the ____.

A) leeway space
B) furcation zone
C) parietal plexus
D) incisor liability

Question 21

Shedding is the loss of mixed dentition caused by resorption of the roots.

Question 22

The lack of development of the pulp proliferative zone leads to root formation failure.

Question 23

Enamel is about twice as thick in permanent teeth as it is in primary teeth.

Question 24

The eruption process is rapid and continuous.

Question 25

Eruptive movement of posterior teeth occurs occlusally through the bony crypt of the jaws to reach the mucosa.

Question 26

During eruption,the epithelial attachment shifts to the cervical area.

Question 27

Primary and permanent teeth have a similar enamel prism structure,except at the tooth surface.

Question 28

The prefunctional eruptive phase is characterized by dormancy in the tissues overlying,surrounding,and underlying the teeth.

Question 29

Active osteoclasts are multinucleated.

Question 30

Osteoblasts are the active cells in both the formation and degradation of the collagen fibers.