What is a cause of relapse of tooth rotation in the shaft?

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Prepare for the Orthodontics 5th Year SC Exam with comprehensive flashcards and multiple-choice questions. Each question offers insightful hints and explanations to optimize your practice and enhance your readiness for the exam!

Multiple Choice

What is a cause of relapse of tooth rotation in the shaft?

Explanation:
The restoring tendency of rotated teeth comes from the elastic memory of the periodontal ligament around the tooth. When you rotate a tooth, the fibers on the compressed side become stressed and those on the stretched side are pulled taut. Once the appliance is removed, these fibers recoil toward their original orientation, pulling the tooth back and causing relapse of the rotation. Occlusal issues can influence stability, but they don’t drive the rotation relapse as directly as the PDL’s elastic recoil.

The restoring tendency of rotated teeth comes from the elastic memory of the periodontal ligament around the tooth. When you rotate a tooth, the fibers on the compressed side become stressed and those on the stretched side are pulled taut. Once the appliance is removed, these fibers recoil toward their original orientation, pulling the tooth back and causing relapse of the rotation. Occlusal issues can influence stability, but they don’t drive the rotation relapse as directly as the PDL’s elastic recoil.

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