Abstract
Among 492 persons, who are the member of the JASDF, 88.03% were discovered to have the periodontal diseases, and the mean PMA index was 16.21 ± 0.5.
The PMA index increased with age, and the 21-25 years old group showed a statistically significant lower index value than the 26-29 years old group.
The student pilot group, whose mean age was 21.7 years, had the PMP index of 12.9.
The alveolar bone of 48 persons, who had the index of more than 12, were roentgenologically examined, which revealed that the absorption of the alveolar bone was definitely correlated with the PMA index, and the index was applicable not only for gingivitis but also for any periodontal diseases.
