Deck 6: Tooth Development and Eruption

Question 1

Which part of the tooth germ is the primary source for the periodontal ligament of the tooth?

A) Dental sac
B) Hertwig epithelial root sheath
C) Stratum intermedium
D) Central cells of dental papilla

Answer 1

Dental sac

Question 2

Which of the following structures is not part of the enamel organ?

A) Stellate reticulum
B) Stratum intermedium
C) Odontoblastic layer
D) Outer epithelial cells

Answer 2

Odontoblastic layer

Question 3

Which part of the enamel organ is the main source of the junctional epithelium?

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

Answer 3

Stratum intermedium

Question 4

The outer cells of the dental papilla are induced to differentiate during tooth development into:

A) pulp tissue.
B) preameloblasts.
C) odontoblasts.
D) cementoblasts.

Question 5

During the cap stage of tooth development,the tooth germ consists of:

A) enamel organ and dental sac.
B) enamel organ and dental papilla.
C) enamel organ, dental sac, and dental papilla.
D) dental sac and dental papilla.

Question 6

The dental lamina is an embryonic structure that develops from the:

A) oral epithelium.
B) mesenchyme.
C) neural crest cells.
D) endodermal layer.

Question 7

The overlapping period between the primary and permanent dentition is best considered the _____ period.

A) deciduous
B) adult
C) secondary
D) mixed dentition

Question 8

The initiation stage of odontogenesis mainly involves the process of:

A) differentiation.
B) proliferation.
C) induction.
D) morphogenesis.

Question 9

Which of the following embryonic structures becomes the dentinoenamel junction during completion of tooth development?

A) Inner cells of the dental papilla
B) Outer cells of the dental papilla
C) Outer enamel epithelium of the enamel organ
D) Basement membrane between the enamel organ and dental papilla

Question 10

During root development,the Hertwig epithelial root sheath is entirely composed of:

A) all layers of the enamel organ.
B) enamel organ and dental papilla.
C) inner and outer cells of the dental papilla.
D) inner and outer enamel epithelium.

Question 11

Which permanent teeth undergo partial anodontia the most within the developing oral cavity?

A) Third molars
B) Mandibular second premolars
C) Maxillary lateral incisors
D) Maxillary first premolars

Question 12

Enamel hypocalcification is a type of enamel dysplasia that involves:

A) an increased number of ameloblasts.
B) a reduction in the quantity of enamel matrix.
C) grooves and pitting on the enamel surface.
D) interference in the metabolic processes of ameloblasts.

Question 13

Which of the following statements is correct when considering odontogenesis?

A) Has a clear-cut beginning and end point to the process
B) Does not include the maturation of the dental tissues
C) Parallels the formation of the face
D) Does not have any identifiable stages

Question 14

Nonsuccedaneous permanent teeth develop from buds that grow off an extension of:

A) each successional dental lamina.
B) both paired palatal shelves.
C) the posterior part of the intermaxillary segment.
D) each primary second molar's dental lamina.

Question 15

Which of the following statements concerning active eruption of a permanent succedaneous tooth is correct?

A) The tooth erupts when the root is completed.
B) The shedding of the associated primary tooth is intermittent.
C) The first junctional epithelium is from the surrounding dental sac.
D) The tooth actively erupts as gingival recession occurs.

Question 16

How many buds in the dental lamina appear along each dental arch during odontogenesis of the primary dentition?

A) 5
B) 10
C) 15
D) 20

Question 17

If a tooth has two roots,how many horizontal epithelial extensions or flaps will be involved in its root formation?

A) One
B) Two
C) Three
D) Four

Question 18

Which embryonic structure is specifically responsible for the development of the root?

A) Stellate reticulum
B) Enamel organ
C) Stratum intermedium
D) Cervical loop

Question 19

What happens to the specific cells from the enamel organ that will differentiate into preameloblasts?

A) Their length shortens.
B) Their nuclei repolarize.
C) Their cellular contents mineralize.
D) They line up along the basement membrane.

Question 20

Where does the dental lamina begin to form first in the developing dental arches?

A) Near the midline
B) Adjacent to the mental foramen
C) Over the region of the future molars
D) Adjacent to the developing temporomandibular joint

Question 21

What is the angled part of the ameloblast that secretes the enamel matrix?

A) Inner enamel epithelium
B) Repolarized preameloblasts
C) Tomes process
D) Disintegrating basement membrane

Question 22

Where does the initial teeth for both dentitions develop?

A) Anterior maxillary region
B) Anterior mandibular region
C) Posterior maxillary region
D) Posterior mandibular region

Question 23

What is the known etiology of supernumerary teeth?

A) Hereditary factors
B) Occlusal trauma involvement
C) Infective teratogen considerations
D) Disintegration of associated membranes

Question 24

During what period of prenatal development is most of the permanent dentition formed?

A) Preimplantation period
B) Embryonic period
C) Fetal period
D) Both embryonic and fetal period

Question 25

Which of the following permanent teeth can be considered nonsuccedaneous?

A) Incisors
B) Canines
C) Premolars
D) Molars

Question 26

Which of the following is the most common complication associated with dens in dente?

A) Macrodontic tooth size
B) Abnormal arch spacing
C) Lingual pit formation
D) Hypercementosis of root surface

Question 27

What term describes the movement of the nuclei within the inner enamel epithelium as the tissue forms into preameloblasts?

A) Dentinogenesis
B) Repolarization
C) Disintegration
D) Maturation

Question 28

Lack of initiation within the dental lamina results in the absence of a single tooth or multiple teeth,producing:

A) supernumerary teeth.
B) anodontia.
C) dens in dente.
D) germination.

Question 29

Tubercles are a developmental disturbance that occurs during the cap stage of tooth development with both dentitions,but with the permanent dentition it can be mainly noted on the:

A) occlusal surface of premolars.
B) occlusal surface of third molars.
C) cingulum on mandibular lateral incisors.
D) cingulum of mandibular canines.

Question 30

Which stage of tooth formation occurs for the primary dentition during the eleventh and twelfth week of prenatal development?

A) Bell stage
B) Initiation stage
C) Cap stage
D) Bud stage