Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Practice MCQ > tooth development > Flashcards

tooth development Flashcards

1
Q

Concrescence is:
a- An extra root or accessory roots in a formed tooth.
b- Distorted root or roots in a formed tooth.
c- A union of root structure of two or more teeth through cementum only.
d- A spherical projection on the cemental root surface.

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What structure is formed in the crown first?
a- Enamel.
b- Cementum.
c- Pulp.
d- Dentine.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Which of the following induces the dental papilla cells to be differentiated into
odontoblasts?
a- Stratum intermedium.
b- Reduced enamel epithelium.
c- Inner enamel epithelium.
d- Outer enamel epithelium.

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

No basal lamina is found between the cells of the:
a- Stratum intermedium and inner enamel epithelium.
b- Outer enamel epithelium and the dental sac.
c- Inner layer of Hertwig’s sheath and the dental papilla.
d- Inner enamel epithelium and the dental papilla.

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which of the following is not a functional activity of the enamel organ:
a- Inducing the differentiation of Odontoblasts.
b- Secretion of enamel matrix.
c- Maturation of enamel.
d- Formation of cementum.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which of the following is not derived from the dental organ:
a- Stellate reticulum.
b- Hertwig’s epithelial root sheath.
c- Odontoblasts.
d- Ameloblasts.

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The stratum intermedium:
a- Induces dentin formation.
b- Is separated from the stellate reticulum by a basal lamina.
c- Develops in cap stage.
d- Is important for enamel maturation.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The dental organ
a- Develops from cells in the dental follicle.
b- Is a completely connective tissue structure.
c- Is a completely epithelial structure.
d- Is highly vascular, as ameloblasts require an enriched environment.

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The enamel cord
a- Is an extension of the dental lamina.
b-Is an extension of the outer dental epithelium.
c- Is an extension of successional dental lamina
d-Extends from the stratum intermedium to the stellate reticulum.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Dental follicle cells
a- Differentiate into the ameloblast layer.
b- Differentiate into the odontoblast layer.
c- Are found within the dental organ.
d- Migrate to dentin surface of the root and differentiate into the cementoblast.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

All of the following is the functions of The Stellate Reticulum except:
a- Keep Space for The enamel development.
b- Act as a reservoir for nutritive materials.
c- Act as a cushioned to protect ameloblasts.
d- Secretes alkaline phosphatase enzyme.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The epithelial root sheath of Hertwig disintegrates:
a- After odontoblastic differentiation & before dentin matrix formation.
b- After odontoblastic differentiation & dentin matrix deposition.
c- Before odontoblastic differentiation.
d- After cementum formation.

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

All of the following is a function of dental sac except:
a- Nutrition of enamel organ.
b- Formation of cementum.
c- Formation of periodontal ligament.
d- Formation of supporting alveolar bone.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The lateral dental lamina gives rise to:
a- Deciduous teeth .
b- Permanent successors.
c- Permanent molars.
d- Vestibular lamina.

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The stratum intermedium:
a- Lies between outer enamel epithelium & stellate reticulum.
b- Is a transient structure.
c- Is rich in mucopolysaccharides.
d- Plays important role in enamel calcification.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The down growth of an epithelial thickening buccal to the dental lamina is
known as:
a- Vestibular lamina.
b- Linguo-alveolar Sulcus.
c- Lateral dental lamina.
d- Successional dental lamina.

A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The dental lamina is induced to proliferate into a tooth bud by the:
a- Basement membrane.
b- Nerve endings.
c- Ecto-mesenchyme.
d- Oral epithelium.

A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Calcified tissues of the tooth are derived from:
a- Ectoderm only.
b- Endoderm only.
c- Mesoderm only.
d- Ectoderm & Mesoderm.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

A layer of cells that seems to be essential to enamel formation but does not actually secrete the enamel is:
a- Outer dental epithelium.
b- Stratum intermedium.
c- Reduced dental epithelium.
d- Vestibular lamina.

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

The stimulus that initiates the actual formation of enamel matrix seems to be:
a- Reduction of stellate reticulum.
b- Influence of increased vascularization of the dental sac.
c- Disappearance of the cell free zone of dental papilla.
d- Presence of predentin.

21
Q

The number of roots that are formed is determined by the:
a- Number of root sheaths developed by the enamel organ.
b- Number of medial ingrowths at the epithelial diaphragm.
c- Number of root sheaths developed by the dental sac.
d- Thickness of the cervical loop.

22
Q

Which of the following is the first process to occur in the sequence of tooth
development:
a- Deposition of the first layer of enamel.
b- Deposition of the first layer of dentin.
c- Elongation of the inner dental epithelial cells.
d- Differentiation of odontoblasts.

23
Q

All of the following are involved in the formation of a tooth except:
a- Epithelial root sheath
b- Successional lamina.
c- Dental lamina.
d- Vestibular lamina.

24
Q

The dental lamina initiating the permanent molars develops:
a- As successional lamina.
b- As a distal extension of the dental lamina.
c- As lateral dental lamina.
d- As vestibular lamina.

25
The cell rests of Malassez are derivatives of: a- Cervical ameloblasts. b- Outer enamel epithelium. c- Dental papilla. d- Root sheath.
D
26
The embryo's stomodeum is lined by: a- Ectoderm. b- Endoderm. c- Mesoderm. d- Ectomesenchyme.
A
27
By the 6th week of tooth development, the oral epithelium is: a- 2-3 layers thickness. b- 3-4 layers thickness. c- 4-5 layers thickness. d- 2-5 layers thickness.
A
28
The vestibular lamina gives rise to: a- The alveolodental sulcus. b- The alveolobuccal sulcus. c- The alveololingual sulcus. d- The alveologingival sulcus.
B
29
The ectomesenchymal cell condensation just beneath the enamel organ is called: a- Dental sac. b- Dental follicle. c- pulp. d- Dental papilla.
D
30
The cells of the tooth bud have: a- High RNA content only. b- Low glycogen content only. c- Increased oxidative enzyme activity only. d- All of the above.
D
31
Regulatory genes play a significant role in tooth development, they: a- Control the tooth position. b- Control the tooth number. c- Determine the tooth shape. d- a & b.
D
32
Initiation of dental lamina is induced by: a- Neural crest cell. b- Endoderm. c- Ectoderm. d- Mesoderm.
A
33
Primordium for the permanent dentition appears as an extension of dental lamina into the ectomesenchyme: a- Lingual to the developing primary tooth germ. b- Labial to the developing primary tooth germ. c- Mesial to the developing primary tooth germ. d- Distal to the developing primary tooth germ.
A
34
The region where the inner and outer enamel epithelium meets at the rim of the enamel organ is known as: a- Zone of Flection. b- Cervical loop. c- Epithelial Diaphragm. d- Root Sheath of Hertwing's
B
35
Which the followings is not a function of the stellate reticulum a- Protection of the underlying dental tissues. a function of stellate reticulum: b- Maintenance of tooth shape. c- Support the production of enamel. d- Control the position & number of tooth germs.
D
36
The epithelial pearls are derived from: a- Dental lamina. b- Dental pulp. c- Dental sac. d- Dental organ.
A
37
Odontoblasts start their secretory activity: a- Before enamel matrix production. b- After enamel matrix production. c- During enamel matrix production. d- During & after enamel matrix production.
A
38
Preameloblasts differentiate into ameloblasts: a- After the differentiation of odontoblasts. b- Before the differentiation of odontoblasts. c- During the differentiation of odontoblasts. d- During & after the differentiation of odontoblasts.
A
39
During the early stages of tooth development three transitory structures may be seen, these structures are: a- Enamel knot, enamel organ & enamel niche. b- Enamel knot, enamel cord & enamel niche. c- Enamel knot, enamel organ & enamel epithelium. d- Enamel niche, enamel organ & enamel knot.
B
40
The epithelial rests in the periodontal ligament are derived from: a- Dental pulp. b- Epithelial root sheath of Hertwing's. c- Vestibular lamina. d- Dental sac.
B
41
Appositional stage is confined to: a- Cap stage. b- Bud stage. c- Bell stage. d- Dental lamina.
C
42
Concresense usually occurs with: a- Permanent maxillary molars. b- Permanent maxillary premolars. c- Permanent mandibular premolars. d- Permanent mandibular premolars.
A
43
Supernumerary roots occur mainly with: a- Permanent third molars. b- Permanent second molars. c- Permanent first molars. d- Permanent second premolars.
A
44
Enamel pearls occur in: a- Apical third of molars roots. b- Furcation area of molars. c- Cervical third of molars roots. d- Furcation area of premolars.
B
45
The process of differentiation of mesenchymal cells into Odontoblasts is called
Induction
46
The epithelial root sheath of Hertwing's is composed of: a-Outer enamel epithelium & inner enamel epithelium. b- Inner enamel epithelium & stratum intermedium. c- Outer enamel epithelium & stellate reticulum. d- Stellate reticulum & stratum intermedium.
A
47
Inner dental epithelium: a- Consists of a single layer of cuboidal epithelial cells. b- Consists of a single layer of columnar epithelial cells. c- Consists of a single layer of polyhedral epithelial cells. d- Consists of a single layer of polygonal epithelial cells.
B
48
Determination of the initial position of the first cusp of the tooth during crown pattern formation may be achieved by: a- The enamel knot. b- The enamel cord. c- Both enamel knot and cord. d- None of the above.
A

Practice MCQ (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions