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13 Cards in this Set

  • Front
  • Back
What is the function of the periodontal ligament, and more specifically, the principal fiber bundles?
To anchor the tooth within the bony socket and allow for limited movement in response to occlusal pressure.
Of what is the PDL composed?
Cell (fibroblasts and other CT cells), fibers (Type I collagen predominates), and ground substance (proteoglycans and glycoproteins).
The collagen fiber bundles of the PDL can be classified into two main groups. Name them and state the feature their names are indicative of.
Gingival fiber group – those fibers that do not insert into bone; and dentoalveolar fiber groups – those fibers that insert into alveolar bone.
List three groups of gingival fibers of the PDL.
Gingival, circumferential and transseptal.
Between which structures do these gingival fibers extend?
Gingival – from cementum into the gingiva; , circumferential – from cementum into the lamina propria after extending around the root horizontally; and transseptal – extend from cementum of one tooth across the interdental septum to insert into the cementum of the adjacent tooth.
What is the function of the gingival fibers of the PDL?
Gingival (free and attached) fibers of the PDL resist gingival displacement during occlusal movement.
List five groups of dentoalveolar fibers in the PDL.
Alveolar crest, horizontal, oblique, (peri)apical and interradicular fibers.
Between which structures do these dentoalveolar fibers extend?
Alveolar crest – cementum into the alveolar crest (angled upward); horizontal – cementum of cervical 1/3 of tooth into alveolar bone of socket (angled horizontally); oblique – cementum of apical 2/3’s of the tooth into alveolar bone (angled inferiorly); (peri)apical – radiate from surrounding the apical foramen down to alveolar bone; and interradicular fibers – from cementum of root bifurcation into the apical region of the interradicular septum.
What is the function of the dentoalveolar fibers of the PDL?
They primarily resist vertical movement during occlusion.
What structural/functional unit is formed by the transseptal fibers?
The dental arch.
Do the blood vessels supplying the PDL anastomose?
If so, with vessels from what structure?
They arise as branches from the arteries entering the apical foramen and anastomose with branches from the alveolar bone via its cribriform nature.
What types of nerves are found within the PDL and what is their function?
Autonomic – controlling blood vessel diameter; afferent – sensory via free (unmyelinated) nerve endings (pain sensation) as well as encapsulated nerve endings (pressure).