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Correction of a lingually displaced left mandibular canine tooth

Orthodontic correction of the lingually displaced canine tooth involves the principle of tipping tooth movement, using a fixed incline plane. The following is an explanation of this principle: When a force is applied to a tooth at a single point on the crown, a tipping movement will occur. As this type of force is applied, the tooth pivots against he alveolar crest, and the apex moves in the opposite direction. This creates a center of rotation, or fulcrum, at approximately the junction of the middle and the apical thirds of the root. Areas of compression and tension are created on opposite sides of the periodontal ligament, reducing the undesirable reverse movement of the apex of the tooth. Usually the crown moves more than the root.