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Oral Histo > General Questions > Flashcards

General Questions Flashcards

1
Q

The embryo develops specifically from the _____

A. the entire blastocyst
B. The entire trophoblast
C. The embryonic disc
D. The extraembryonic coelem (space)
E. The morula
A

C. The embryonic disc

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2
Q

Which branchial arch has its derivatives innervated by CN VII?

A. I
B. II
C. III
D. IV

A

B.

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3
Q

Which of the following structures of the adult heart is a remnant of the foramen ovale in the fetal heart?

A. Crista terminalis
B. Fossa ovalis
C. Sulcus terminalis
D. Right auricle
E. Atrial appendage
A

B. Fossa ovalis

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4
Q

Which of the ff germ layer derivatives comprise the epithelial lining of the cardiovascular system?

A. Mesoderm
B. Endoderm
C. Ectoderm
D. Aota
E. Nota
A

A. Mesoderm

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5
Q

In the growing fetus, which specific structure separates the external lips and cheeks from the internal jaw structures?

A. Tuberculum impar
B. Buccopharyngeal membrane
C. Vestibular lamina
D. Hypobranchial eminence
E. Lateral lingual swellings
A

C. Vestibular lamina

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6
Q

Which of the ff portions of the female reproductive tract is the site of fertilization?

A. Uterus
B. Endometrium
C. Ovary
D. Cervix
E. Ampula
A

E. Ampulla

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7
Q

Which of the ff is FALSE regarding the primary palate?

A. It can be involved in facial clefting
B. It contains the incisive foramen
C. It usually contains no teeth
D. It is mesenchymal in origin
E. It is formed by the fusion of 2 median nasal processes
A

C. It usually contains no teeth

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8
Q

The stomodeum and the foregut separated by a membrane consisting of two epithelial layers

A. Dentino-enamel
B. Buccopharyngeal
C. Nasmyth’s
D. Basement membrane

A

B. Buccupharyngeal

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9
Q

All of the ff structures are concerned with the development of the tongue except:

A. Copula
B. Macula
C. Tubercular impar
D. Second branchial arch
E. Third branchial arch
A

B. Macula

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10
Q

Ligamentous remnants of the fetal circulatory system persisting in the adult include the ligament

I. Nuchae
II. Venosum
III. arteriosum
IV. Teres of the liver
V. Teres of the uterus

A. I, II, IV
B. I, II, V
C. I, II, III
D. I, IV, V

A

A. I, II, IV

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11
Q

A caudal structure is close to which part of the embryo?

A. Posterior wall
B. Inferior end
C. Superior end
D. Anterior wall

A

B. Inferior end

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12
Q

Primitive oral cavity is

A. Dental papilla
B. Tooth bud
C. Dental lamina
D. Oral stomodeum

A

D. Oral stomodeum

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13
Q

Neural tube formation occurs on _____

A. 42-55 days post fertilization and is the fourth stage of craniofacial development
B. 17th day post fertilization and is the first stage of craniofacial development
C. 18-23 days post fertilization and is the second stage of craniofacial development
D. 28-38 days post fertilization and is the third stage of craniofacial development

A

C. 18-23 days post fertilization and is the second stage of craniofacial development

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14
Q

The correct order of tooth formation is _______.

A.) a > o > e > d
B.) a > o > d > e
C.) o > d > a > e
D.) a > e > o > d
E.) o > a >d > e
A

B.) a > o > d > e

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15
Q

Which of the ff is a characteristic of the eruptive stage of a tooth?

A. Elongation of cervical loop and formation of HERS
B. Fusion of the REE and oral epithelium
C. Disappearance of the enamel knot
D. Formation of the enamel organ
E. Merging of the OEE with the IEE
A

A. Elongation of the cervical loop and formation of HERS

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16
Q

During odotogenesis, which of the following cells determine the type of the tooth to be formed?

A. Mesoderm
B. Mesenchyme
C. Ectomesenchyme
D. Endoderm
E. Ectoderm
A

C. Ectomesenchyme

17
Q

What will determine the number of roots that will be formed?

A. Periodontal ligament
B. Cushion hammock ligament
C. HERS
D. Epithelial diaphragm

A

D. Epithelial diaphragm

18
Q

This is formed from the REE and the reduced Oral epithelium forming a collar around the teeth

A. Junctional epithelium
B. Marginal gingiva
C. Free gingiva
D. Sulcular epithelium

A

A. Junctional epithelium

19
Q

Tooth enamel is derived from ________.

A. Endoderm
B. Mesoderm
C. Ectoderm
D. Endoderm and mesoderm
E. Ectoderm and mesoderm
A

C. Ectoderm

20
Q

Which of the ff is usually absent in a slide prepared by decalcification?

A. Cellular cementum
B. Odontoblasts
C. Pdl fibers
D. Mature enamel

A

D. Mature enamel

21
Q

A possible avenue for dental caries formation is the _______.

A. Transverse striations
B. Enamel lamellae
C. Bands of retries
D. Dentinal tubules

A

B. Enamel lamellae

22
Q

The structural characteristic of enamel that is mesenchymal in origin:

A. Enamel lamellae
B. Enamel spindle
C. Enamel tufts
D. Enamel pearl

A

B. Enamel spindle

23
Q

Enamel is harder than bone because it is tightly packed with smaller enamel hydroxyapatite crystals. Four times smaller than those in bone. The enamel prisms form the structural foundation of enamel. The first statement is ______.

A. Incorrect and the 2nd is correct
B. Correct and the 2nd is correct
C. Correct and the 2nd is incorrect
D. Incorrect and the 2nd is incorrect

A

A. Incorrect and the 2nd is correct

24
Q

Enamel is a highly mineralized structure containing approximately 95% of inorganic matter. The largest mineral constituents are hydroxyapatite crystals. The first statement is:

A. Correct, 2nd correct
B. Incorrect, 2nd incorrect
C. Incorrect, 2nd correct
D. Correct, 2nd incorrect

A

A. Correct, 2nd correct

25
Q

Which of the ff statements about enamel are true?

I. About 95% of enamel is inorganic
II. The major constituents as for dentin is phosphorus, carbonate and magnesium
III. The water content of enamel is?
IV. Amino acid makeup of enamel protein as a keratin the protein of other
V. Enamel is ectodermal in origin

A. II, IV, V
B. I, II, III, V
C. I, II, III, IV
D. I, II, IV

A

B. I, II, III, V

26
Q

Hypothetically speaking, when preparing a cavity preparation of the crown of a fully formed permanent tooth, as you initially cut through enamel and into dentin, which structure is first being penetrated?

A. Circumpulpal dentin
B. Mantle dentin
C. Odontoblasts
D. Radicular dentin
E. Circumpulpal and radicular dentin
A

B. Mantle dentin

27
Q

All of the ff structures may be found in dentin except

A. Globular dentin
B. Neonatal line (accentuated line)
C. Striae of Retzius
D. Contour lines of Owen
E. Odontoblastic processes
A

What is the most likely cause if a patient complains of tooth sensitivity and clinical examination reveals areas of gingival recession exposing the roots of each teeth?

A. Fluids entering the lacunae of the cementum
B. Fluids entering the enamel rods
C. Movement of fluid in the sulcular epithelium
D. Movement of fluid in the dentinal tubules

28
Q

What line indicates the early variation in the secretory activity of dentin?

A. Salter’s
B. Cement
C. Von Ebner’s
D. Line of Retzius

A

C. Von Ebner’s

29
Q

The number/amount of the ff structures can give an indication on the age of the tooth except

A. Enamel lamellae
B. Enamel tufts
C. Sclerotic dentin
D. Cellular cementum

A

B. Enamel tufts

30
Q

The irregularly shaped calcified structures commonly found in the pulp are called

A. Denticles
B. Cementicles
C. Enamel pearls
D. Sclerotic dentin

A

A. Denticles

31
Q

The cementum that is first laid down that directly covers dentinal tubules is:

A. Cellular mixed fiber cementum
B. Acellular extrinsic fiber cementum
C. Intermediate cementum
D. Cellular intrinsic fiber cementum

A

C. Intermediate cementum

32
Q

Which of the ff statements is NOT true regarding cementum?

A. It has more mineral content than bone
B. It is continuously deposited at the apical portion
C. It has a component of the tooth and periodontium
D. It seals the end of the dentinal tubules

A

A. It has more mineral content than bone

33
Q

Relative to the oral cavity, which of the layers of mucosa interdigitates with the rete pegs?

A. Stratum granulosum
B. Papillary layer of lamina propria
C. Stratum corneum
D. Reticular layer of LP
E. Stratum spinosum
A

B. Papillary layer of LP

34
Q

Which of the ff oral epithelial types is keratinized?

A. Sulcular epithelium
B. Alveolar mucosa
C. Junctional epithelium
D. Attached gingiva
E. Gingival col
A

D. Attached gingiva

35
Q

Which of the ff is the depression of the interdental gingiva that connects the lingual and facial papilla?

A. Gingival col
B. Alveolar mucosa
C. Attached gingiva
D. Mucogingival juntion
E. Interdental papilla
A

A. Gingival col

36
Q

Physiologic mesial drift is a tooth movement that

A. Is required for pre-eruptive tooth movement
B. Compensates for interproximal wear
C. Compensates for occlusal tooth wear
D. Accommodates growing jaws

A

B. Comopensates for interproximal wear

37
Q

What is passive eruption?

A. Movement of tooth to compensate for proximal wear
B. Movement of tooth to compensate for occlusal wear
C. Gradual exposure of the crown and later of the root by gingival recession
D. Movement of the tooth towards the occlusal place

A

C. Gradual exposure of the crown and later of the root by gingival recession

Oral Histo (2 decks)

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