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1. The movement of teeth from their normal position in the dental arch. It can be caused by the loss of an adjacent tooth, the loss of an opposing tooth, traumatic tooth relationships, inflammation or disease of the supporting structures, or oral habits such as digit sucking. See also drifting.

2. The movement of the junctional epithelium onto the root surface with the development of chronic periodontitis and resultant loss of attachment.

Subjects: Dentistry.

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