Orthodontics · single question
Which periodontal fibers are responsible for tooth relapse/rotation after orthodontic treatment?
Show answer and explanation
Correct answer: B. Gingival fibers (circular/dentogingival)
✓ B) Gingival fibers (particularly the supracrestal/free gingival fibers) are correct.
The supracrestal (free gingival/circular) fibers are the primary cause of rotational relapse after orthodontics. These fibers have 'elastic memory' and are not remodeled as quickly as the alveolar bone PDL fibers. They pull teeth back toward their original position. Fiberotomy (circumferential supracrestal fiberotomy/CSF) — surgically severing these fibers — helps prevent rotational relapse. Transseptal fibers maintain interproximal contact but are less responsible for rotation.
The supracrestal (free gingival/circular) fibers are the primary cause of rotational relapse after orthodontics. These fibers have 'elastic memory' and are not remodeled as quickly as the alveolar bone PDL fibers. They pull teeth back toward their original position. Fiberotomy (circumferential supracrestal fiberotomy/CSF) — surgically severing these fibers — helps prevent rotational relapse. Transseptal fibers maintain interproximal contact but are less responsible for rotation.