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Oral Histology > Periodontal Ligament > Flashcards

Periodontal Ligament Flashcards

1
Q

Which of the following cells are the predominant connective tissue cells of the periodontal ligament?
A. Cementoblasts
B. Fibroblasts
C. Osteoblasts
D. Cell rests of Malassez

A

B. Fibroblasts

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2
Q

The periodontal ligament:
A. Derives its blood primarily from the branches of vessels entering the pulp
B. Has a slow rate of turn over
C. Contains epithelial cells
D. Comprises primarily of type II collagen

A

C. Contains epithelial cells

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3
Q

Which of the following is not the principal fiber group of the periodontal ligament?
A. Horizontal
B. Oblique
C. Alveolar crest
D. Transseptal

A

D. Transseptal

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4
Q

Which of the following is correct?
A. Fibronectin helps in attachment of fibroblasts to collagen
B. Cementicles are found in periodontal ligament of order individuals
C. The large nerve fibres are myelinated and are concerned with discerment of touch
D. The small nerve fibres may or may not be myelinated and are concerned with discrement of pain
E. All of the above

A

E. All of the above

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5
Q

In a dried skull, holes on the lingual aspects of the deciduous teeth are called_____________?
A. Volkmann canals
B. Canals of Hirschfeld and Zuckerkandl
C. Haversian canals
D. Gubernacular canals

A

D. Gubernacular canals

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6
Q

The type of bone present in the labial area of anterior teeth is_______________?
A. Cortical
B. Cancellous
C. Osteophytics
D. Exophytic

A

A. Cortical

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7
Q

Width of PDL is_______________?
A. 0.10 mm
B. 0.50 mm
C. 0.25 mm
D. 0.75 mm

A

C. 0.25 mm

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8
Q

The periodontal ligament is approximately_____________?
A. 0.25 mm in thickness
B. 0.5 mm in thickness
C. 0.75 mm in thickness
D. mm in thickness

A

A. 0.25 mm in thickness

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9
Q

Development of supporting tissues of the tooth is initiated by____________?
A. Cells of dental follicle
B. Cells of odontogenic layer
C. Cementoblasts
D. Cells of the gingiva

A

A. Cells of dental follicle

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10
Q

Width of the periodontal ligament is least at______________?
A. Cervical third
B. Apical third
C. Fulcrum of rotation
D. It has uniform width

A

C. Fulcrum of rotation

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11
Q

Cementicles are found in the_____________?
A. Gingiva
B. Periodontal ligament
C. Alveolar bone
D. Cementum

A

B. Periodontal ligament

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12
Q

Periodontal ligament is made up of____________?
A. Type I collagen
B. Type I and Type III collagen
C. Type I and Type II collagen
D. Type I and Type IV collagen

A

B. Type I and Type III collagen

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13
Q

Interdependency of osteoblasts and osteoclasts in bone remodeling is called as_____________?
A. Lacunae
B. Coupling
C. Reversal lines
D. Canaliculi

A

B. Coupling

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14
Q

Periodontal fibers joining cemental surface of one tooth, to cemental surface of adjacent tooth are called____________?
A. Gingivodental fibers
B. Cemental fibers
C. Horizontal fibers
D. Transseptal fibers

A

D. Transseptal fibers

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15
Q

Sharpey’s fibres are derived from_____________?
A. Hertwig’s root sheath
B. Epithelial rests of malassez
C. Alveolar bone
D. Dental follicle

A

D. Dental follicle

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16
Q

Periodontal ligament has predominantly_________?
A. Type II collagen fibers
B. Oxytalan fibers
C. Elastic fibers
D. Type I collagen fibers

A

D. Type I collagen fibers

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17
Q

Which of the following groups of fibers are not attached to alveolar bone?
A. Transseptal
B. Horizontal
C. Oblique
D. Apical

A

A. Transseptal

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18
Q

The most abundant principle fibre group in periodontal ligament is____________?
A. Horizontal
B. Transseptal
C. Apical
D. Oblique

A

D. Oblique

19
Q

In mammals independent and tough suspension for teeth is provided by____________?
A. Alveolar sockets
B. Cementum
C. Gubernacular cords
D. Periodontal membrane

A

D. Periodontal membrane

20
Q

Group of fibers, which resist the masticatory forces___________?
A. Dentogingival
B. Transseptal
C. Oblique
D. Horizontal

A

C. Oblique

21
Q

Fibers of periodontal ligament embedded in the bone are_____________?
A. Sharpey’s fibers
B. Tomes fibers
C. Elastic fibers
D. Ray’s fibers

A

A. Sharpey’s fibers

22
Q

The attached apparatus of tooth is composed of______________?
A. Gingiva, cementum and alveolar bone
B. Gingiva and cementum
C. Cementum and periodontal ligament
D. Peridontal ligament the cementum and the alveolar bone

A

D. Peridontal ligament the cementum and the alveolar bone

23
Q

Age changes in periodeontal ligament include which of the following?
A. Increased fibroplasia
B. Increased vascularity
C. Increased thickness
D. Decreased in number of cementicles

A

A. Increased fibroplasia

24
Q

Collagen molecule exhibits all of the following features except_____________?
A. Triple pleated sheath
B. Mostly contains glycine residues
C. Exhibit cross striations at 64 μm
D. Intracellular in nature

A

D. Intracellular in nature

25
Q

A special feature of the periodontal ligament fibroblasts is______________?
A. The number or organelles
B. Presence of actin fibers and shape change
C. Size of the cells
D. Collagen fiber formation

A

B. Presence of actin fibers and shape change

26
Q

The component of future T.M.J shows development at _____________?
A. 6 weeks
B. 10 weeks
C. 18 weeks
D. 16 weeks

A

B. 10 weeks

27
Q

Center of the disc in TMJ is_____________?
A. Avascular
B. Devoid of nervous tissue
C. Avascular & devoid of nervous tissue
D. None of the above

A

C. Avascular & devoid of nervous tissue

28
Q

Narrowing of periodontal ligament in labially placed mandibular canine with age is due to_____________?
A. Due to deposition of cementum and bone
B. Down growths of gingival epithelium
C. Gingival cysts formed from cell rests
D. Reversal of function of horizontal and oblique fibers

A

A. Due to deposition of cementum and bone

29
Q

The main function of horizontal fibers of periodontal ligament is____________?
A. Prevent extrusion
B. Prevent rotation
C. Maintains the mesiodistal width
D. All of the above

A

C. Maintains the mesiodistal width

30
Q

The rest of malassez in the periodontal ligament are derived from_____________?
A. Dental pulp
B. Lamina propria
C. Odontogenic epithelium
D. Vestibular lamina

A

C. Odontogenic epithelium

31
Q

The most abundant group of fibers in the PDL are_____________?
A. Trans-septal
B. Horizontal
C. Oblique
D. Apical

A

C. Oblique

32
Q

True about osteoclasts_____________?
A. Monocytes are precursor cells of osteoclasts
B. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border
C. Contain lysosomes with acid phosphates
D. All of the above are true

A

D. All of the above are true

33
Q

Sharpey’s fibers are present in_______________?
A. Bone
B. Periosteum
C. Periodontal ligament
D. All of the above

A

A. Bone

34
Q

Intermediate plexus is absent in which of the following principle fibers _____________?
A. Gingival
B. Oblique
C. Horizontal
D. Transseptal

A

A. Gingival

35
Q

The calcified mass found in the PDL are_____________?
A. Cementicles
B. Osteoblasts
C. Cementoclasts
D. Osteoclasts

A

A. Cementicles

36
Q

Principal fibers of periodontal ligament are attached to_____________?
A. Alveolar bone proper
B. Bundle bone
C. Lamellar bone
D. Cortical bone

A

B. Bundle bone

37
Q

Collagen biosynthesis occurs inside the______________?
A. Chondroblasts
B. Odontoblasts
C. Osteoblasts
D. Fibroblasts

A

D. Fibroblasts

38
Q

Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibers is known as______________?
A. Lamina dura
B. Bundle bone
C. Lamina propria
D. Lamina densa

A

B. Bundle bone

39
Q

Intermediate plexus is seen in the____________?
A. Cementum
B. Periodontal ligament
C. Pulp
D. Dentin

A

B. Periodontal ligament

40
Q

The vascular supply of the periodontal ligament is______________?
A. Greatest in the middle-third of a single rotted tooth
B. Greatest in the middle-third of a multirooted tooth
C. A net like plexus that runs closer to the cementum than to the bone
D. A net like plexus that runs closer to the bone than to the cementum

A

D. A net like plexus that runs closer to the bone than to the cementum

41
Q

All of the following cells of periodontal ligament are of mesenchymal origin except______________?
A. Fibroblasts
B. Multi totipotent cells
C. Cementoblasts
D. Cell rests of malassez

A

D. Cell rests of malassez

42
Q

Remnants of the Hertwig’s root sheath are found in____________?
A. Gingiva
B. Alveolar bone
C. Periodontal ligament
D. Cementum

A

C. Periodontal ligament

43
Q

Anchoring fibrils are composed of_____________?
A. Type V and VII collagen
B. Type I and III collagen
C. Type IV collagen
D. Type IV and III Collagen

A

A. Type V and VII collagen

44
Q

Important diagnostic tool to determine the presence and severity of periodontal diseases.

A

Periodontal probing

Oral Histology (8 decks)

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