[Key points of orthodontic treatment for patients with periodontal diseases].

To obtain optimum result in patients with periodontal diseases, orthodontists need not only treatment techniques but deep understanding of the periodontal status of the patients. On the other hand, orthodontists should keep in mind the concept of multi-disciplinary treatment for these patients. This paper describes nine key points of orthodontic treatment for patients with periodontal disease, and gives some guidance and warnings to orthodontists.