The effect of orthodontic tooth movement on endodontically treated teeth

There is often the need of moving teeth, which was endodontically treated or teeth still in endodontic treatment. Orthodontic movement of endodontically treated teeth was approached with suspicion for many years, and clinicians abstain from applying orthodontic movement to teeth. This movement inevitably causes biological reactions in periodontal ligament and pulp. Application of a severe orthodontic force for a long time can cause irreversible pulpitis and necrosis in pulp by increasing pulp inflammation process. Use of moderate and intermittent forces enables sufficient tooth movement, limits the damage in the pulp, and allows the damaged pulp healing. Microscopic root resorption occurs in all teeth during orthodontic treatment, which is clinically insignificant and cannot be determined radiographically. The aim of this review is to determine issues to be considered for endodontic terms before orthodontic treatment, the alterations which may be occurred in the pulp, hard tissues, and periapical region of the teeth during and after treatment and how these changes affect the results of treatment.