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Oral Histology > Cementum > Flashcards

Cementum Flashcards

1
Q

Which dental tissue doesn’t contain nerves?
A. Bone
B. Dentin
C. Cementum
D. Pulp

A

C. Cementum

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2
Q

Which of the following is least mineralized?
A. Cementoid
B. Incremental line
C. Cellular cementum
D. Acellular cementum

A

A. Cementoid

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3
Q

Root lengthening is contributed by____________?
A. Cellular cementum
B. Acellular cementum
C. Intermediate cementum
D. All of the above

A

A. Cellular cementum

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4
Q

Trauma or excessive occlusal forces causes_____________?
A. Hyperplasia of cementum
B. Hypertrophy of cementum
C. Resorption of cementum
D. None of the above

A

C. Resorption of cementum

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5
Q

At the CEJ cementum overlaps enamel about____________?
A. 55 to 60%
B. 60 to 65%
C. 65 to 70%
D. 70 to 75%

A

B. 60 to 65%

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6
Q

Cementum is_____________?
A. Avascular
B. Vascular
C. Has blood supply initially only
D. None of the above

A

A. Avascular

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7
Q

If overgrowth of cementum does not improve the functional qualities of cementum, it is termed as_____________?
A. Hyperplasia
B. Hypoplasia
C. Hypertrophy
D. Excementoses

A

A. Hyperplasia

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8
Q

Intermediate cemental layer_____________?
A. Does not exhibit features of either dentin of cementum
B. Predominantly seen in apical two thirds of roots of molars and premolars and is rare in incisors or deciduous teeth
C. Represents area of entrapment of Hertwig’s sheath in dentin or cementum
D. All of the above are correct

A

D. All of the above are correct

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9
Q

Cementum that forms in conjunction with root end formation and eruption_____________?
A. Cellular cementum
B. Acellular cementum
C. Both of the above
D. None of the above

A

A. Cellular cementum

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10
Q

Which of the following is a rare occurrence______________?
A. Enamel meet cementum at a point
B. Enamel overlaps cementum
C. Cementum overlaps enamel
D. Both never meet

A

B. Enamel overlaps cementum

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11
Q

Maximum fluoride content is seen in_____________?
A. Dental cementum
B. Dental pulp
C. Enamel
D. Dentin

A

A. Dental cementum

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12
Q

Secondary cementum is generally confined to_____________?
A. Cervical third of the root
B. Middle third of the root
C. Apical third of the root
D. No secondary cementum forms

A

C. Apical third of the root

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13
Q

Cellular cementum and compact bone contain____________?
A. Sharpey’s fibres and elastic fibers
B. Collagen fibers and blood vessels
C. Canaliculi and incremental lines
D. Lacunae and elastic fibres

A

C. Canaliculi and incremental lines

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14
Q

Cellular cementum is____________?
A. First formed cementum
B. Less calcified than acellular type
C. More calcified than acellular type
D. Less irregular

A

B. Less calcified than acellular type

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15
Q

Bundle bone is part of____________?
A. Periodontal ligament
B. Alveolar bone
C. Cementum
D. Longbones

A

B. Alveolar bone

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16
Q

Hardness of fully mineralized cementum is_____________?
A. Less than dentin
B. More than dentin
C. Equal dentin
D. None of the above

A

A. Less than dentin

17
Q

Which of the following is true of cellular cementum ?
A. Forms during root formation
B. Forms after the eruption of the tooth
C. Seen at the coronal portion of the tooth
D. Formation is a slow process

A

B. Forms after the eruption of the tooth

18
Q

The cementoenamel junction is approximately at the level at which the root canal becomes_____________?
A. Twisted
B. Curved
C. Pulp chamber
D. Lateral canal

A

C. Pulp chamber

19
Q

Intermediate cementum is____________?
A. Highly defined cellular zone near cemento – dentinal junction (CDJ)
B. Highly defined fibrillar zone near CDJ
C. Poorly defined zone near cemento-dentinal junction
D. Both a and B

A

C. Poorly defined zone near cemento-dentinal junction

20
Q

Inorganic content of cementum is______________?
A. 45 to 50%
B. 50 to 55%
C. 55 to 60%
D. 60 to 65%

A

A. 45 to 50%

21
Q

The region in which cementum formation is most rapid is_____________?
A. Middle
B. Coronal
C. Apical
D. Interradicular

A

C. Apical

22
Q

Which of the following statement is true______________?
A. Cementum is thinnest at CEJ (20-50μm)
B. Cementum is thickest towards the apex (150-200μm)
C. The apical foramen is surrounded by cementum
D. All of the above

A

D. All of the above

23
Q

Reestablishing the former outline of the root surface is_____________?
A. Anatomic repair
B. Functional repair
C. Physiological repair
D. Hyperplasia

A

A. Anatomic repair

24
Q

Intermediate cementum is___________?
A. Between enamel and cementum
B. Found at dentinocemental junction
C. Apical third
D. Coronal third

A

B. Found at dentinocemental junction

25
Q

Which of the following is correct?
A. Cementum is more resistant to resorption than bone
B. Bone is more resistant to resorption than cementum
C. Both are equally resorbable
D. None of the above

A

A. Cementum is more resistant to resorption than bone

26
Q

Chronic periapical inflammation is usually associated with____________?
A. Ankylosis
B. Resorption of cementum
C. Hypertrophy of cementum
D. Hyperplasia of cementum

A

D. Hyperplasia of cementum

27
Q

If cementum is not formed______________?
A. Ankylosis may occur
B. Exfoliation of teeth occur
C. Delayed eruption
D. No change occurs

A

B. Exfoliation of teeth occur

28
Q

Which of the following is true______________?
A. The uncalcified matrix of cementum is called cementoid
B. Cementum contain type I collagen predominantly
C. Cementodentinal junction is sometimes scallops in deciduous teeth and smooth in permanent teeth
D. All of the above

A

D. All of the above

29
Q

Acellular cementum is typically found in_____________?
A. Coronal half of root
B. Apical half of root
C. Apex of root
D. Entire root

A

A. Coronal half of root

30
Q

Cellular cementum is typically found in_____________?
A. Coronal half of root
B. Apical half of root
C. Apex of root
D. Entire root

A

B. Apical half of root

31
Q

At the cementoenamel junction, which of the following occurs_____________?
A. Cementum meets enamel
B. Cementum overlaps enamel
C. Cementum does not meet enamel
D. All of the above

A

D. All of the above

32
Q

Inorganic content of cementum is_____________?
A. Less than bone
B. More than bone
C. Equal to that of bone
D. More than that of enamel

A

A. Less than bone

33
Q

Butt joint in cementoenamel junctions seen is _________% of cases?
A. 10%
B. 30%
C. 60%
D. 90%

A

B. 30%

34
Q

Cementum_____________?
A. Is derived from the sheath of hertwig
B. Is acellular in the apical third of the tooth
C. Often overlaps the enamel
D. Does not contain collagen fibres

A

C. Often overlaps the enamel

35
Q

Type of cementum located in the furcation areas of multirooted teeth is:
A. Cellular extrinsic fiber cementum
B. Cellular intrinsic fiber cementum
C. Cellular mixed stratified cementum
D. Acellular intrinsic fiber cementum

A

C. Cellular mixed stratified cementum

36
Q

The lacunae which contains cementocytes shows canaliculi that is oriented towards :
A. The crown
B. The dentin side
C. The PDL space
D. The root apex

A

C. The PDL space

Oral Histology (8 decks)

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