[Orthodontic treatment and periodontal problems. 1].

Because of the increasing frequency of orthodontic treatments of patients with periodontal problems, the authors evaluate effects deriving from orthodontic treatment on periodontal tissues and provide practical indications to manage such patients. Experimental and clinical studies on effects of trauma from occlusion on periodontal tissues in different clinical conditions are examined. The authors have also considered studies dealing with periodontal response to different orthodontic therapy items, with particular regard to gingival inflammation degree and likelihood of root resorption. From the results of such clinical and experimental studies, the authors have pointed out clinical indications to treat periodontal patients.