Report of the Survey on Periodontal Diseases in Japan

Abstract

On Aug. 1, 1963, President of the Japan Dental Association submitted “Present Status of Japanes Periodontal Diseases” to Japanese Society for Dental Health. And then, Japanese Society for Dental Health accepted this matter, and established Committee of Survey of Periodontal Diseases. The Committee dispatched a special investigational group, and the study was performed on the entity of the said disease in Japan from an independent standpoint of the Society. As for the objects employed and the methods of the present investigation, 10 areas were selected from among the those investigated on dental diseases in all over Japan by Ministry of Health and Welfare, Japan, in Nov. 1963. And, the mass clinical examination was performed on 955 persons with their age more than 10, living in the above 10 areas regarding 4 symptoms of the abnormality of periodontal diseases such as redness of periodontal tissue, swelling of periodontal tissue, exposed dental root and loosening of teeth.As the result, the following findings were obtained. Among the patients having the above 4 symptoms, the rate of those who have one and or more than one symptom was 97.38%.In view of the classification by each symptom, the average number of existence of teeth per person was 12.2 teeth on the redness of periodontal tissue, and 11.3 teeth on the swelling of periodontal tissue, 2.5 teeth on the exposed root of teeth, and 1.4 teeth on the loosening teeth.Also, the rate of existence of teeth present was 52.82 % on the redness of periodontal tissue, 48.95% on the swelling of periodontal tissue, 11.46% on the exposed root of teeth, and 6.15 % on the loosening of teeth.In the classification by age-group consisting of every 5 years older persons, redness and swelling of periodontal tissue were observed in nearly equal number on the above each age-group, showing marked increasing tendency in the group of their age up to 34, but decreased in the group of their age more than 35.Exposed root of teeth and the loosening of teeth were observed increasingly in the group of the higher age, but the exposed root of teeth was observed more increasingly than the loosening of teeth.The comparison on the above 4 symptoms by sex in each age-group was attempted while observing each symptom in classification by the kind of teeth, and those sexual comparison showed specific values classified by teeth and sexual differences.