Transseptal Fibers: The Key To Tooth Stability And Orthodontic Relapse

Transseptal Fibers: The Key To Tooth Stability And Orthodontic Relapse

Question 1. Synthetic cells of PDL.
Answer:

Question 2. Transseptal fibers.
Answer:

• These fibers run interdentally from the cementum apical to the junctional epithelium of one tooth over the alveolar crest to a similar region of the adjacent tooth.
• By these, all tire teeth are connected in an arch.
• They are responsible for post-retention relapse of orthodontic treatment.
• They are capable of turnover and remodeling under normal physiologic conditions and therapeutic tooth movement.
• They ensure clinical stability of tooth position.

Question 3. Bundle fibers of the periodontal membrane.
Answer:

Fiber bundles composing ligament:

1. Dentogingival group:

• Extends from cervical cementum to lamina propria of the free and attached gingiva.

2. Alveologingival group:

• Extends from the bone of the alveolar crest to lamina propria of the free and attached gingiva.

3. Circular group:

• It forms a band around the neck of the tooth.

4. Dentoperiosteal group:

• Runs apically from the cementum up to the alveolar process.

5. Transseptal fiber:

• Run interdentally from the cementum of one tooth to the cementum of the adjacent tooth.

Question 4. Age changes in the periodontal ligament.
Answer:

• The cell number and activity decrease with age
• PDL fibers become attached to the scalloping ends of the alveolar bone.
• PDL activity decreases.
• Destructive changes occur due to the presence of gingival and periodontal diseases in old age.
• Some of the teeth become non-functional.
• PDL width decreases.