[Limits of orthodontic treatment of periodontally affected dentitions].

Basically there are no exact metric limits in terms of probing depth or loss of periodontal attachment, up to which orthodontic tooth movement is possible. Each individual treatment plan depends on a great variety of factors and is limited particularly by biomechanical considerations (uncontrolled force systems, limited anchorage quality) and the risks associated with specific periodontal conditions (tooth/alveolar bone topography, sinus recessus, activity and prognosis of periodontitis).