Orthodontic extrusion: periodontal considerations and applications.

Human teeth erupt naturally to compensate for tooth wear and tear. When a subgingival lesion such as crown fracture occurs, the general practitioner must consider orthodontic extrusion of the tooth to allow for prosthetic rehabilitation. However, because this therapeutic approach is not appropriate in all cases, each tooth must be carefully analyzed before treatment. The amount of force applied depends on the desired effect. Orthodontic extrusion can also be used to augment bone and tissue in the course of preparing an implant site. In most cases, endodontic treatment must be completed first, with close attention being paid to the contour of the final restoration. The benefits of extrusion are clear, but patients must nonetheless be informed of the disadvantages.