Periodontal ligament Flashcards
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.
C
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.
B
Which of the following is not present in the periodontal ligament?
a- Epithelial rests of Malassez.
b- Fibroblasts.
c- Cementoblasts.
d- Osteocytes.
D
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
The periodontal ligament develops from:
a- Dental organ. b- Dental sac.
c- Dental papilla. d- Dental lamina.
B
The principal fibers of periodontal ligament are:
a- Elastic. b- Oxytalan.
c- Collagen. d- Precollagen.
C
Which of the following groups of tissues comprise the periodontium?
a- Alveolar bone, periodontal ligament, cementum.
b- Periodontal ligament, cementum, gingiva.
c- Cellular cementum, periodontal ligament, alveolar bone.
d- Cementum, alveolar bone, periodontal ligament, gingiva.
D
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.
B
Elasticity of periodontal ligament is due to:
a- Presence of elastic fibers.
b- Presence of oxytalan fibers.
c- Wavy coarse of collagen fibers.
d- Non of the above.
C
Function of oxytalan fibers:
a- Support nerves. b- Support blood vessels.
c- Help fibroblasts migration. d- All of the above.
D
The periodontal ligament is formed of:
a- Cells only. b- Fibers only.
c- Ground substances only. d- All of the above.
D
Open faced nucleus is found in:
a- Resorptive cells.
b- Synthetic cells.
c- Defensive cells.
d- Progenitor cells.
B
The protective function of periodontal ligament is achieved by its:
a- Fibers. b- Blood vessels.
c- Nerves. d- All of the above.
D
