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Oral Histology > Tooth Eruption and Shedding > Flashcards

Tooth Eruption and Shedding Flashcards

1
Q

Which of the following statement is false______________?
A. Resorption of roots of deciduous incisors and canines begins on their lingual surfaces
B. Resorption of roots of deciduous molars begins on their inner surfaces
C. Shedding of deciduous teeth is delayed in the absence of their successor teeth
D. All of the above

A

D. All of the above

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2
Q

Osteoblasts appear basic gram staining due to______________?
A. Increased ribonucleic acid
B. Acidic ground substance
C. Increased mitochondria
D. Presence of basic ground substance

A

A. Increased ribonucleic acid

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3
Q

The maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ________ μm/day?
A. 100
B. 75
C. 50
D. 25

A

B. 75

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4
Q

Calcified tissue is absent in______________?
A. Enamel
B. Dentin
C. Cementum
D. Pulp

A

D. Pulp

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5
Q

Which of the following factors are primarily contributory to the shedding of deciduous tooth?
A. Hydrostatic
B. Vascular pressure
C. Oncotic pressure
D. Masticatory pressure

A

D. Masticatory pressure

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6
Q

The apical foramen of a fully developed permanent tooth is usually lined by_____________?
A. Dentin
B. Cementum
C. Epithelial rest cells
D. The Epithelial diaphragm

A

B. Cementum

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7
Q

Specific stain for fat cells is___________?
A. Eosin & haematoxylin
B. Carbol fuschin
C. Sudan III
D. Cresyl violet

A

C. Sudan III

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8
Q

Extracted teeth should be preserved in_____________?
A. Saline
B. Xylene
C. 10% Formalin
D. 10% alcohol

A

C. 10% Formalin

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9
Q

Oral tissue for microscopic examination is prepared by_______________?
A. Embedded in paraffin and sectioned
B. Embedded in paradion and sectioned
C. Frozen and sectioned
D. Specimens ground into thin sections
E. All of the above

A

E. All of the above

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10
Q

Which enzyme is associated with the mineralization_____________?
A. Acid phosphatase
B. Alkaline phosphatase
C. Adenosine triphosphate
D. Amino peptidase

A

B. Alkaline phosphatase

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11
Q

Hammock ligament is present_______________?
A. Between temporal and sphenoid bone
B. Between hamular notch and mandible
C. In apical area of a tooth
D. As a part of deep cervical fascia

A

D. As a part of deep cervical fascia

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12
Q

The most accepted theory of tooth eruption is____________?
A. Hydrodynamic theory
B. Clone theory
C. Periodontal ligament traction theory
D. Vascular theory

A

C. Periodontal ligament traction theory

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13
Q

Teeth with out antagonist if erupt is called____________?
A. Stable
B. Over erupted
C. Supra erupted
D. Submerged

A

C. Supra erupted

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14
Q

Movement of tooth to close the intermaxillary gap during eruption is due to____________?
A. Physiological tooth migration
B. Active eruption
C. Passive eruption
D. None of the above

A

B. Active eruption

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15
Q

In mineralization which one of the following is known as Epitaxy?
A. Booster Mechanism
B. Seeding theory
C. Alkaline Phosphatase theory
D. Cartier/s Adenosine Triphosphate theory

A

B. Seeding theory

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16
Q

The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about_____________?
A. 25th day of Intra uterine life
B. 34th day of Intra uterine life
C. 56th day of Intra uterine life
D. 20 wks of Intra uterine life

A

C. 56th day of Intra uterine life

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17
Q

The deciduous teeth can be differentiated from permanent teeth by_____________?
A. Enamel prismatic arrangement
B. Dentinal tubule arrangement
C. Primary and secondary dentin
D. Mineral content

A

A. Enamel prismatic arrangement

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18
Q

Which type of collagen fibers demonstrates Chicken wire configuration?
A. Type I
B. Type II
C. Type III
D. Type IV

A

D. Type IV

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19
Q

Accentuated incremental lines in dentin are______________?
A. Incremental lines of retzius
B. Incremental lines of von Ebner
C. Contour lines lines of owen
D. None of the above

A

C. Contour lines lines of owen

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20
Q

Gubernacular canal and gubernacular cord are seen in relation to____________?
A. Permanent teeth
B. Deciduous teeth
C. Succedaneous teeth
D. None of the above

A

C. Succedaneous teeth

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21
Q

The cells, which are responsible for removal of bone matrix in bone resorption, are_____________?
A. Osteoblast
B. Fibrocytes
C. Polymorphs
D. Osteoclasts

A

D. Osteoclasts

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22
Q

Frozen sections can be used for the demonstration of_____________?
A. Fat
B. Mucin
C. Cartilage
D. Iron

A

A. Fat

23
Q

Dehydration of specimen is carried out by____________?
A. By using 10% formalin
B. By using liquid or solid Co2
C. By using increasing percentages of alcohol
D. By using 5% nitric acid

A

C. By using increasing percentages of alcohol

24
Q

A suitable fixative for a routine biopsy specimen is_____________?
A. 10% formalin
B. 40% formalin
C. 20% formalin
D. 10% alcohol

A

A. 10% formalin

25
Q

Epithelial attachment is derived from____________?
A. Reduced enamel epithelium
B. Dental papilla
C. Inner enamel epithelium
D. Dental sac

A

A. Reduced enamel epithelium

26
Q

Tooth buds of permanent mandibular incisors are situated_____________?
A. Lingual to primary teeth
B. Inferior to primary teeth
C. Labial to primary teeth
D. A and B

A

D. A and B

27
Q

Gubernacular canal guides the eruption of_____________?
A. Primary teeth
B. Permanent teeth
C. Both A and B
D. None of the above

A

B. Permanent teeth

28
Q

Resorption of dental tissue is caused by_____________?
A. Osteoclasts
B. Osteoblasts
C. Odontoclasts
D. Odontoblasts

A

C. Odontoclasts

29
Q

Tooth eruption is due to______________?
A. Osteoclastic activity
B. Proliferation of cells at crypt
C. Exforliation of primary tooth
D. Eruptive force

A

D. Eruptive force

30
Q

In resorption of roots of the primary teeth, the dental pulp_____________?
A. Plays a passive role
B. Becomes a fibrotic non-vital mass
C. Initiates resorption from the inner surface of roots
D. Aids in formation of secondary dentin slowing down resorption

A

A. Plays a passive role

31
Q

The first permanent tooth to erupt in the oral cavity is the:
A. Mandibular central incisor
B. Mandibular First Molar
C. Maxillary Central Incisor
D. Maxillary First Molar

A

B. Mandibular First Molar

32
Q

The age of a child having 12 permanent and 12 deciduous teeth is:?
A. Four and half years
B. Eight and half years
C. Eleven and half years
D. Thirteen years
E. Fourteen years

A

B. Eight and half years

33
Q

The last primary tooth to be replaced by a permanent tooth is usually the:
A. Maxillary second molar
B. Mandibular second molar
C. Maxillary canine
D. Mandibular canine

A

C. Maxillary canine

34
Q

The most common sequence of eruption of the permanent maxillary teeth in children is:
A. 1-6-2-3-4-7-5-8
B. 2-3-1-6-7-5-4-8
C. 6-1-2-4-3-5-7-8
D. 6-1-2-3-4-5-7-8

A

C. 6-1-2-4-3-5-7-8

35
Q

Calcification of permanent first molar usually begins:
A. In the third month of intrauterine life
B. In the sixth month of intrauterine life
C. At birth
D. In the third month after birth

A

C. At birth

36
Q

A radiograph of a four year child reveals no evidence of calcification of mandibular second premolar. This indicates:
A. It is too early to make final prediction
B. The teeth may develop later
C. Primary second molar extracted to allow mesial drifting of permanent first molar
D. The child may never develop premolars

A

B. The teeth may develop later

37
Q

The usual order of appearance of the primary teeth in the mouth is:
A. Central incisors, first molars, lateral incisors, second molars, canines
B. Central incisors, lateral incisors, canines, second molars, first molars
C. Central incisors, lateral incisors, first molars, second molars, canines
D. Central incisors, lateral incisors, first molars, canines , second molars

A

D. Central incisors, lateral incisors, first molars, canines , second molars

38
Q

First evidence of initiation of primary dentition is usually around?
A. 4 months in utero
B. Birth
C. 4 months after birth
D. One year after birth

A

A. 4 months in utero

39
Q

Eruption of deciduous maxillary second molar occurs at:
A. 20 months
B. 18 months
C. 24 months
D. 28 months

A

D. 28 months

40
Q

The sequence of eruption of permanent teeth in mandible is:
A. 1-6-2-3-5-4-7-8
B. 6-1-2-3-4-5-7-8
C. 6-1-2-4-5-3-7-8
D. 6-1-2-4-3-5-7-8

A

C. 6-1-2-4-5-3-7-8

41
Q

Dentition of human is?
A. Herbivorous
B. Omnivorous
C. Carnivorous
D. None of the above

A

B. Omnivorous

42
Q

Number of teeth seen on X-ray at birth is:
A. 20
B. 22
C. 24
D. 30

A

C. 24

43
Q

At birth the following teeth are calcifying:
A. Primary incisors and first molar
B. Primary canines and second molars
C. Permanent canines
D. Permanent third molar

A

A. Primary incisors and first molar

44
Q

James, a 6 year old child received tetracycline. Noticeable discoloration will be seen in ?
A. Canines, premolars and second molars
B. Canines and second molars
C. Incisors and first molars
D. Incisors, premolars and first molars

A

A. Canines, premolars and second molars

45
Q

Once the enamel formation is complete, the tooth will erupt after approximately?
A. One year
B. Two years
C. Three years
D. Four years

A

C. Three years

46
Q

Calcification of third molar begins at?
A. 8 months
B. 18 months
C. 8 years
D. 16 years

A

C. 8 years

47
Q

The deciduous canine emerges?
A. Before lateral incisor
B. Before first molar
C. After first molar
D. After second molar

A

C. After first molar

48
Q

Which of these teeth are highly sturdy and usually the last ones to be lost ?
A. Canines
B. Premolars
C. First molar
D. Central incisors

A

A. Canines

49
Q

The root growth theory of eruption proposes that eruption is due to the push of the:
A. Elongating roots against the base of the alveolar crypt
B. Proliferating periodontal ligament
C. Expanding pulp in the root canals against the alveolar crypt

A

A. Elongating roots against the base of the alveolar crypt

50
Q

Active eruption of the tooth:
a. Begins as soon as the roots have begun to develop
b. Begins as the occlusal tip starts moving toward the occlusal plane
c. Begins when the apical cementum is deposited on the roots of the tooth
d. Continues until occlusal contact has been made
e. Continues until exposure of the cementum has occurred

A. B & D
B. A only
C. A, B & E

A

A. B & D

51
Q

The recession of the gingiva, which continues gradually until various amounts of cementum have been exposed:

A

Passive Eruption

52
Q

Continuous eruption maintains occlusion during tooth attrition. What mechanism is responsible for this ongoing eruption?
A. Alveolar bone growth
B. Root dentin formation
C. Cementum deposition
D. Enamel deposition

A

C. Cementum deposition

53
Q

Which process INCORRECTLY describes tooth eruption?
A. Formation of Hertwig’s root sheath
B. Completion of crown synthesis
C. Induction of dental follicle cells to become odondoblasts
D. Alveolar bone remodeling
E. Deposition of intermediate cementum

A

C. Induction of dental follicle cells to become odondoblasts

Oral Histology (8 decks)

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