Long‐term maintenance of patients treated for advanced periodontal disease*

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Abstract
Periodontal conditions of a group of patients who, following active treatment of extremely advanced periodontal disease, had been maintained for 14 yr in a maintenance program were evaluated. The sample included 61 subjects out of an initial group of 75 individuals who were treated in 196%. Following initial examination, the patients were given detailed instructions in proper plaque control measures and were subjected to scaling and root planing and surgical elimination of pathologically deepened pockets. After the termination of the active treatment phase, the patients were placed in a maintenance care program including recall appointments every 3-6 mo. At the initial examination, immediately after the completion of the active treatment phase and then once a year, all patients were examined regarding oral hygiene, gingival conditions, probing depths and clinical attachment levels. In addition, the interproximal alveolar bone height was determined from full mouth radiographs obtained before active treatment, at the completion of active therapy and 1, 3, 5, 8, 10, 12 and 14 yr after treatment. The results from the repeated examinations demonstrated that treatment of advanced forms of periodontal disease resulted in clinically healthy periodontal conditions and that this state of periodontal health could be maintained in most patients and sites over a period of 14 yr. It was also demonstrated that the treatment and maintenance programs described were equally effective in young and older patients. The individual mean values describing probing depths, attachment levels and bone heights did not vary significantly over the 14 yr of observation. A more detailed analysis of the data revealed, however, that a small number of sites in a few patients lost a substantial amount of attachment. This attachment loss occurred at different time intervals during the course of the maintenance period. Thus, 43 surfaces in 15 different patients were exposed to recurrent periodontal disease of a significant magnitude. This recurrent inflammatory periodontal disease caused the loss of 16 teeth in 7 different patients during the maintenance period. The data reported question the validity of using individual mean values to describe alterations of the periodontal conditions during maintenance following active periodontal therapy.