Adjunctive orthodontic treatment is defined as tooth movement carried out to facilitate other dental procedures that may be required to control disease, restore function, or enhance appearance. As an example, an adult patient with a missing first molar is commonly treated by uprighting the adjacent second molar for eventual prosthetic replacement. Differential diagnosis, force selection, and appliance design are key factors in successful molar uprighting. Although early mechanics tended to cause molar extrusion or premolar intrusion, more recently developed springs can upright molars without these undesirable side effects.
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