Chapter 11: PDL

Question 1

What is the primary function of the Periodontal Ligament?

Answer 1

The primary function of the ligament is support of the teeth. It also transmits input to the masticatory apparatus and has a nutritive function that is essential to maintaining the ligament’s health.

Question 2

What is the PDL made of and where is it located?

Answer 2

The periodontal ligament is a fibrous connective tissue between the alveolar bone proper and the cementum covering the tooth root. It occupies the periodontal space.

Question 3

Mesial and/or distal drifting is a result from which fiber group?

Answer 3

Transseptal fibers

Question 4

What are the principal fibers of the Periodontal Ligament?

Answer 4

Gingival fibers

Question 5

Name 4 Gingival fibers

Answer 5

Free gingival fibers
Attached gingival fibers
Alveolar crest
Circular or circumferential fibers

Question 6

Where do transseptal fibers originate from and what are their functions?

Answer 6

Originate in the cervical region of each crown and extend to mesial and distal surfaces of each adjacent tooth. Functions in resistance to the separation of each tooth.

Question 7

What is the difference between gingival and dentoalveolar fibers?

Answer 7

Gingival group of fibers are located around the necks of the teeth.
The dentoalveolar group of fibers surround the roots of the teeth.