Oral Histology Mcqs - Set 6

1)   Cementum is_____________?

a. Avascular
b. Vascular
c. Has blood supply initially only
d. None of the above
Answer  Explanation 

ANSWER: Avascular

Explanation:
No explanation is available for this question!


2)   If overgrowth of cementum does not improve the functional qualities of cementum, it is termed as_____________?

a. Hyperplasia
b. Hypoplasia
c. Hypertrophy
d. Excementoses
Answer  Explanation 

ANSWER: Hyperplasia

Explanation:
No explanation is available for this question!


3)   Intermediate cemental layer_____________?

a. Does not exhibit features of either dentin of cementum
b. Predominantly seen in apical tow 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
Answer  Explanation 

ANSWER: All of the above are correct

Explanation:
No explanation is available for this question!


4)   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
Answer  Explanation 

ANSWER: Cellular cementum

Explanation:
No explanation is available for this question!


5)   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
Answer  Explanation 

ANSWER: Enamel overlaps cementum

Explanation:
No explanation is available for this question!


6)   Maximum fluoride content is seen in_____________?

a. Dental cementum
b. Dental pulp
c. Enamel
d. Dentin
Answer  Explanation 

ANSWER: Dental cementum

Explanation:
No explanation is available for this question!


7)   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
Answer  Explanation 

ANSWER: Apical third of the root

Explanation:
No explanation is available for this question!


8)   Cellular cementum and compact bone contain____________?

a. Sharpehy’s fibres and elastic fibres
b. Collagen fibres and blood vessels
c. Canaliculi and incremental lines
d. Lacunae and elastic fibres
Answer  Explanation 

ANSWER: Canaliculi and incremental lines

Explanation:
No explanation is available for this question!


9)   Cellular cementum is____________?

a. First formed cementum
b. Less calcified than acellular type
c. More calcified than acellular type
d. Less irregular
Answer  Explanation 

ANSWER: Less calcified than acellular type

Explanation:
No explanation is available for this question!


10)   Bundle bone is part of____________?

a. Periodontal ligament
b. Alveolar bone
c. Cementum
d. Longbones
Answer  Explanation 

ANSWER: Alveolar bone

Explanation:
No explanation is available for this question!


11)   Hardness of fully mineralized cementum is_____________?

a. Less than dentin
b. More than dentin
c. Equal dentin
d. None of the above
Answer  Explanation 

ANSWER: Less than dentin

Explanation:
No explanation is available for this question!


12)   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
Answer  Explanation 

ANSWER: Forms after the eruption of the tooth

Explanation:
No explanation is available for this question!


13)   The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?

a. Twisted
b. Curved
c. Pulp chamber
d. Lateral canal
Answer  Explanation 

ANSWER: Pulp chamber

Explanation:
No explanation is available for this question!


14)   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
Answer  Explanation 

ANSWER: Poorly defined zone near cemento-dentinal junction

Explanation:
No explanation is available for this question!


15)   Inorganic content of cementum is______________?

a. 45 to 50%
b. 50 to 55%
c. 55 to 60%
d. 60 to 65%
Answer  Explanation 

ANSWER: 45 to 50%

Explanation:
No explanation is available for this question!


16)   The region in which cementum formation is most rapid is_____________?

a. Middle
b. Coronal
c. Apical
d. Interradicular
Answer  Explanation 

ANSWER: Middle

Explanation:
No explanation is available for this question!


17)   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
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


18)   Reestablishing the former outline of the root surface is_____________?

a. Anatomic repair
b. Functional repair
c. Physiological repair
d. Hyperplasia
Answer  Explanation 

ANSWER: Anatomic repair

Explanation:
No explanation is available for this question!


19)   Intermediate cementum is___________?

a. Between enamel and cementum
b. Found at dentinocemental junction
c. Apical third
d. Coronal third
Answer  Explanation 

ANSWER: Found at dentinocemental junction

Explanation:
No explanation is available for this question!


20)   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
Answer  Explanation 

ANSWER: Cementum is more resistant to resorption than bone

Explanation:
No explanation is available for this question!


21)   Chronic periapical inflammation is usually associated with____________?

a. Ankylosis
b. Resorption of cementum
c. Hypertrophy of cementum
d. Hyperplasia of cementum
Answer  Explanation 

ANSWER: Hyperplasia of cementum

Explanation:
No explanation is available for this question!


22)   If cementum is not formed______________?

a. Ankylosis may occur
b. Exforliation of teeth occur
c. Delayed eruption
d. No change occurs
Answer  Explanation 

ANSWER: Exforliation of teeth occur

Explanation:
No explanation is available for this question!


23)   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 scallopes in deciduous teeth and smooth in permanent teeth
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


24)   Acellular cementum is typically found in_____________?

a. Coronal half of root
b. Apical half of root
c. Apex of root
d. Entire root
Answer  Explanation 

ANSWER: Coronal half of root

Explanation:
No explanation is available for this question!


25)   At the cemento enamel 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
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


26)   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
Answer  Explanation 

ANSWER: Less than bone

Explanation:
No explanation is available for this question!


27)   Butt joint in cementoenamel junctions seen is _________% of cases?

a. 10%
b. 30%
c. 60%
d. 90%
Answer  Explanation 

ANSWER: 30%

Explanation:
No explanation is available for this question!


28)   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
Answer  Explanation 

ANSWER: Often overlaps the enamel

Explanation:
No explanation is available for this question!


29)   Which of the following is correct?

a. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts
b. Dead tracts appear black in transmitted and white in reflected ligth
c. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


30)   Matrix vesicles_______________?

a. Are found in mantle dentin
b. Contain collagen
c. Produce alkaline phosphatase
d. Inhibit mineralization
Answer  Explanation 

ANSWER: Are found in mantle dentin

Explanation:
No explanation is available for this question!