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This study was to investigate the influence of age on the progress of periodontal destruction by examining experimental periodontitis complicated by traumatic lesions.Seventy-two sites in three 1-year-old (group 1y) and 6-year-old (group 6 y) female beagles were used.Both groups 1 y and 6 y were further divided into three groups. In group T, trauma was induced by an orthodontic jiggling force under the appropriate plaque control. In group I, ligature-induced inflammation was provoked.In group TI, both trauma and inflammation were simultaneously induced. The gingival flap was elevated around the experimental teeth, and notches were made on the roots at the height of the crest of the alveolar bone; these notches were used as reference points for histometric measurements.In groups I and TI, a cotton ligature were tied around the neck of the tooth to provoke periodontal inflammation. One week later, a jiggling force was applied in groups T and TI using orthodontic power chains, altering the direction at one-week intervals. The clinical parameters were observed for 17 weeks, followed by histological observation and a histometric analysis. In group T, significant differences were not observed between group 1 y and 6 y with regand to clinical and histometric parameters other than tooth mobility.In groups I and TI, group 6 y showed a wider area of inflammation and larger periodontal destruction than group 1y showed. These results suggest that age does not have a significant influence on traumatic lesion, but that periodontal destruction caused by inflammation and/or traumatic force is accelerated in older beagus.

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