PDL Flashcards

1
Q
The PDL fibers running between two adjacent teeth:
a- Belong to the dento-alveolar group.
b-Are gingival fibers.
c- Are transseptal fibers.
       d- Are oxytalan fibers.
A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Which of the following is not true of the alveolodental periodontal fibers? They:
a- Are organized into bundles with different orientation.
b- Are derived from epithelial rests of Malassez.
c- Undergo continuous remodeling.
d- Are formed and partially resorbed by fibroblasts.

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
Which of the following is not present in the periodontal ligament?
a- Epithelial rests of Malassez.
b- Fibroblasts.
c- Cementoblasts.
d- Osteocytes.
A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
Which of the following principal fibers groups constitutes the main attachment of the tooth?
a- Oblique group.
b- Apical group.
c- Horizontal group.
d- Alveolar group.
A

A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Which groups of tissues comprise the periodontium?

A

Cementum, alveolar bone, periodontal ligament, gingiva.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The width of the periodontal ligament:
a- It is thiner when teeth are functioning normally.
b- It is narrowest at the level of the midroot area.
c- It becomes wider with aging.
d- It is of uniform width around multi-rooted teeth.

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

The periodontal ligament develops from what?

A

The dental sac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Elasticity of periodontal ligament is due to what?

A

Wavy coarse of collagen fibers.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The principal fibre of periodontal ligament is what?

A

collagen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Function of oxytalan fibers:
a- Support nerves. b- Support blood vessels.
c- Help fibroblasts migration. d- All of the above.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Open faced nucleus is found in:
a- Resorptive cells. b- Synthetic cells.
c- Defensive cells. d- Progenitor cells.

A

B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The periodontal ligament is formed of:
a- Cells only. b- Fibers only.
c- Ground substances only. d- All of the above

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The protective function of periodontal ligament is achieved by its:
a- Fibers. b- Blood vessels.
c- Nerves. d- All of the above.

A

D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The periodontal ligament
a, Derives its blood supply 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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
Remnants of the Hertwig’s root sheath are found in:
A. Gingiva
B. Alveolar bone
C. Periodontal ligament
D. Cementum
A

C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
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

18
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

19
Q

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

20
Q
Fibres of periodontal ligament embedded in the bone are:
A. Sharpey's fibres
B. Tomes fibres
C. Elastic fibres
D. Ray's fibres
21
Q
Group of fibres, which resist the masticatory forces
A. Dentogingival
B. Transeptal
C. Oblique
D. Horizontal
22
Q
Intermediate plexus is seen in the:
A.  Cementum
B. PDL
C. Pulp
D. Dentin
23
Q
In mammals independent and tough suspension for teeth is provided by:
A. Alveolar sockets
B. Cementum
C. Gubernacular cords
D. Periodontal membrane
24
Q

Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known B. Bundle bone
C. Lamina
D. Lamina densa

25
Q
The most abundant principle fibre group in periodontal 
A. Horizontal
B. Transeptal
C. Apical
D. Oblique
26
Q
Collagen biosynthesis occurs inside the:
A. Chondroblasts
B. Odontoblasts
C. Osteoblasts
D. Fibroblasts
27
Q
Which of the following groups of fibres are not attached to alveolar bone?
A. Transseptal
B. Horizontal
C. Oblique
d. Apical
28
Q
Principal fibres of periodontal ligament are attached to:
A. Alveolar bone proper
B. Bundle bone
C. Lamellar bone
D. Cortical bone
29
Q
The calcified mass found in the PDL are:
A. Cementicles
B. Osteoblasts
C. Cementoclasts
D. Osteoclasts
30
Q
Sharpey’s fibres are derived from:
A. Hertwig's root sheath
B. Epithelial rests of malassez
C. Alveolar bone
D. Dental follicle
31
Q
Sharpey’s fibres are present in:
A. Bone
B. Periosteum
C. Periodontal ligament
D. All of the abov
32
Q

Interdependency of osteoblasts and osteoclasts in bone remodeling is called as:

Lacunae
Coupling
Reversal lines
Canaliculi

33
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

34
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

35
Q
Cementicles are found in the;
A. Gingiva
B. Periodontal ligament
C. Alveolar bone
D. Cementum
36
Q
The rest of malassez in the periodontal ligament are derived from
A. Dental pulp
B. Lamina propria
C. Odontogenic epithelium
D. Vestibular lamina
37
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
38
Q
The main function of horizontal fibres of P.D ligament is:
A. Prevent extrusion
B. Prevent rotation
C. Maintains the mesiodistal width
D. All of the above
39
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. 1.0 mm in thickness

40
Q
The component of future T.M.J shows development at?
A. 6 weeks
B. 10 weeks
C. 18 weeks
D. 16 weeks