Objectives:To ascertain the functional condition of teeth and periodontal tissue, we assessed dynamic occlusion by analyzing occlusal sound. In this study, as part of our investigation of the dynamic occlusion of patients having mild periodontitis, we sought to determine whether improvements in periodontitis resulting from initial preparation could bring about changes in the duration and frequency distribution of occlusal sound. Methods: The subject group included seven adults with mild periodontitis, who were treated according to the conventional methods of initial preparation. Occlusal sound generated by tapping was recorded before and after the initial preparation from the cheekbone with headgear for occlusal sound recording, and waveform analysis software was used to assess changes in duration and frequency distributions. Results: The results showed that the average duration of occlusal sound before the initial preparation was 2.40 msec, a figure that was significantly reduced after the initial preparation to 1.98 msec (p<0.01). For the frequency distribution of occlusal sound, the ratio of the high-frequency area increased after the initial preparation. Hence, it is clear that improvements in periodontitis resulting from initial preparation alter the duration and frequency distribution of occlusal sound. Conclusions: These findings suggest that it may be possible to assess the functional condition of teeth and periodontal tissue by measuring the duration and frequency distribution of occlusal sound. Supported by a Grant from the Ministry of Education, Culture, Sports, Sceience and Technology to promote 2001-Multidiscipinary Research Projects (in2001~2005).

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