General Questions

Question 1

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

Answer 1

C. The embryonic disc

Question 2

Which branchial arch has its derivatives innervated by CN VII?

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

Answer 2

B.

Question 3

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

Answer 3

B. Fossa ovalis

Question 4

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

Answer 4

A. Mesoderm

Question 5

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

Answer 5

C. Vestibular lamina

Question 6

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

Answer 6

E. Ampulla

Question 7

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

Answer 7

C. It usually contains no teeth

Question 8

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

Answer 8

B. Buccupharyngeal

Question 9

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

Answer 9

B. Macula

Question 10

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

Answer 10

A. I, II, IV

Question 11

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

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

Answer 11

B. Inferior end

Question 12

Primitive oral cavity is

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

Answer 12

D. Oral stomodeum

Question 13

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

Answer 13

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

Question 14

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

Answer 14

B.) a > o > d > e

Question 15

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

Answer 15

A. Elongation of the cervical loop and formation of HERS

Question 16

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

Answer 16

C. Ectomesenchyme

Question 17

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

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

Answer 17

D. Epithelial diaphragm

Question 18

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

Answer 18

A. Junctional epithelium

Question 19

Tooth enamel is derived from ________.

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

Answer 19

C. Ectoderm

Question 20

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

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

Answer 20

D. Mature enamel

Question 21

A possible avenue for dental caries formation is the _______.

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

Answer 21

B. Enamel lamellae

Question 22

The structural characteristic of enamel that is mesenchymal in origin:

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

Answer 22

B. Enamel spindle

Question 23

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

Answer 23

A. Incorrect and the 2nd is correct

Question 24

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

Answer 24

A. Correct, 2nd correct

Question 25

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

Answer 25

B. I, II, III, V

Question 26

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 ```

Answer 26

B. Mantle dentin

Question 27

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 ```

Answer 27

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

Question 28

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

Answer 28

C. Von Ebner’s

Question 29

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

Answer 29

B. Enamel tufts

Question 30

The irregularly shaped calcified structures commonly found in the pulp are called A. Denticles B. Cementicles C. Enamel pearls D. Sclerotic dentin

Answer 30

A. Denticles

Question 31

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

Answer 31

C. Intermediate cementum

Question 32

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

Answer 32

A. It has more mineral content than bone

Question 33

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 ```

Answer 33

B. Papillary layer of LP

Question 34

Which of the ff oral epithelial types is keratinized? ``` A. Sulcular epithelium B. Alveolar mucosa C. Junctional epithelium D. Attached gingiva E. Gingival col ```

Answer 34

D. Attached gingiva

Question 35

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 ```

Answer 35

A. Gingival col

Question 36

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

Answer 36

B. Comopensates for interproximal wear

Question 37

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

Answer 37

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