Drifting, tipping, supraeruption, and segmental alveolar bone growth.

Drifting, tipping, supraeruption, and segmental alveolar bone growth are the four major forms of nonorthodontic intraoral tooth movement. They may occur separately but usually occur in combination (Fig. 6). They can occur at any age but tend to be most devastating in their effects on the dentition of the young adult and the elderly. They may represent nonrestorable occlusal situations if combined and present in both arches. Clear diagnosis is therefore essential prior to the formulation of a treatment plan.