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Practice MCQ > Tooth development > Flashcards

Tooth development Flashcards

1
Q

What structure is formed in the crown first?

A

Dentine

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2
Q

What induces the dental papilla cells to be differentiated into odontoblasts?

A

Inner enamel epithelium.

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3
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

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4
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

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5
Q 
6- 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

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6
Q

What does the stratum intermedium do?

A

Is important for enamel maturation.

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7
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

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8
Q

What is the enamel cord?

A

Extends from the stratum intermedium to the stellate reticulum.

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9
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

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10
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

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11
Q

The epithelial root sheath of Hertwig disintegrates

A

After odontoblastic differentiation & dentin matrix deposition.

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12
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

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13
Q

The lateral dental lamina gives rise to what?

A

Deciduous teeth

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14
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

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15
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

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16
Q

What is the stimulus that initiates the actual formation of the enamel matrix?

A

Influence of increased vascularization of the dental sac.

17
Q

The number of roots that are formed is determined by what?

A

Number of medial ingrowths at the epithelial diaphragm.

18
Q 
The vestibular lamina gives rise to:
a- The alveolodental sulcus.
b- The alveolobuccal sulcus.
c- The alveololingual sulcus.
d- The alveologingival sulcus.
A

B

19
Q

How do Regulatory genes play a significant role in tooth development?

A

They control the tooth position and the tooth number

20
Q

When do Preameloblasts differentiate into ameloblasts?

A

After the differentiation of odontoblasts

21
Q

The process of differentiation of mesenchymal cells into

Odontoblasts is called?

A

Induction

22
Q

Before enamel formation begins:
a- Enamel knot disappears and enamel cord remains.
b- Enamel knot remains and enamel cord disappear.
c- Both knot and cord disappear.
d- Both knot and cord remain.

A

C

23
Q

Concerning the stratum intermedium, one of the following statements is incorrect:
a- It is composed of 2-3 layers of squamous epithelial cells.
b- It is differentiated between the inner enamel epithelium and stellate reticulum.
c- It is connected to each other and to the cells of stratum intermedium by desmosomes.
d- It is essential for enamel formation as it contains acid phosphatase enzyme.

A

B

24
Q

Which one of the following functions of the inner dental epithelium is wrong?
a- It exerts an organizing influence on the undifferentiated cells of the dental
papilla to differentiate into ameloblasts.
b- It shares in the transport of the nutritive materials.
c- It determines the future incisal or occlusal crown pattern.
d- It lays down enamel matrix and helps in its mineralization.

A

A

25
Q

The epithelial root sheath of Hertwig can’t be seen as a continuous layer in the developing root because:
a- The rapid epithelial sheath proliferation.
b- The dentin formation.
c- The rapid epithelial sheath destruction after dentin formation.
d- All of the above.

A

C

26
Q

Epithelial rests of Malassez are:
a- Epithelial strands and may undergo degeneration only.
b- Epithelial remnants of the epithelial root sheath of Hertwig only.
c- Network or isolated islands in the P.L. only,
d- All of the above.

A

D

27
Q

If Hertwig’s epithelial root sheath does not disintegrate:
a- No cementum will be formed on the radicular dentin.
b- It is likely that some of the enamel will be resorbed.
c- The apical end of the junctional epithelium will lie occlusal to the
cemento-enamel junction.
d- Predentine will form on the outer surface of the radicular dentin.

A

A

28
Q

The reduced enamel epithelium is derived from:
a- Maturative ameloblasts and stratum intermedium.
b- Stratum intermedium, stellate reticulum and outer dental epithelium.
c- Stratum intermedium, stellate reticulum and inner epithelium.
d- Protective ameloblasts, stratum intermedium, stellate reticulum and outer dental epithelium.

A

D

29
Q

Which of the following indicates the major components of a tooth germ?
a- The dental lamina, the stellate reticulum and the stratum intermedium.
b- The dental organ, the dental papilla and the dental sac.
c- The dental pulp, the dental sac and the dental lamina.
d- The cervical loop, Hertwig’s sheath and the inner enamel epithelium.

A

B

30
Q

Which of the following is not true of Hertwig’s epithelial root sheath?
a- It lacks a stellate reticulum.
b- It is derived from stomodeal ectoderm.
c- Its remnants form epithelial rests.
d- It remains intact until a layer of cementum has been formed.

A

D

31
Q 
Which of the following contain blood vessels?
a- Cartilage.
b- Enamel.
c- Dental lamina.
d- Dental sac.
A

D

32
Q

The development of the root begins when what event occurs?

A

The crown is completely formed

33
Q

The epithelial component of the tooth germ is known as what?

A

The enamel organ

34
Q 
Which of the following is not part of the tooth germ?
a- Dental papilla.
b- Dental follicle.
c- Dental lamina.
d- Enamel organ.
A

C

35
Q

The reduced enamel epithelium:
a- Lacks cells derived from the stellate reticulum.
b- Contains protective ameloblasts.
c- Overlies immature enamel which has not yet reached its full thickness.
d- Does not cover enamel located at the cervical end of the crown.

A

B

36
Q 
Which of the following is a component of tooth germ?
a- Lateral dental lamina.
b- Successional lamina.
c- Vestibular lamina.
d- Dental sac.
A

D

Practice MCQ (7 decks)

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