The Japanese Journal of Pediatric Dentistry
Online ISSN : 2186-5078
Print ISSN : 0583-1199
ISSN-L : 0583-1199
A Longitudinal Study of Periodontal Conditions in Junior High School Students
-A two -year follow up-
Satsuki Kuwahara, Mitsugi Okada, Kanami Mitsuzawa, Mariko Okamoto, Yuki Iwamoto, Nobuhiko Sakuma, Toshio Ichinose, Kaori Takagi, Noriko Nii, Tsuyoshi Samuta, Makiko Shoto, Chikako Takeda, Saori Awane, Akio Ikegami, Yuka Kawaguchi, Katsuyuki Kozai, Kazuo Miura, Nobuo Nagasaka
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Keywords: Oral Rating Index, Periodontal conditions, Junior high school students, Longitudinal study, Epidemiological research
JOURNAL FREE ACCESS

1997 Volume 35 Issue 5 Pages 871-879

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Abstract
The purpose of this study was to follow longitudinal changes in the periodontal conditions of junior high school students. The Oral Rating Index was used, which is designed for screening periodontal conditions. The survey was conducted on 117 students enrolled from a school in Hiroshima, Japan. The study took place over a period of two years. The percentages of negative assessment (ORI of -1and -2) at grade 7,8 and 9 were 19.7,30.8 and 45.3, respectively. The periodontal conditions became worse according to increased grade. The mean ORI scores of grade 7,8 and 9 were 0.38, -0.13and -0.26, respectively. There was a significant difference among the three grades (p< 0.001). As for gender, the mean ORI score of the boys was higher than that of the girls at grade 7 (p< 0.01). On the other hand, the mean ORI score of the girls was higher than that of the boys at grade 9 (p< 0.05). Comparing periodontal conditions at grade 7 and 9,52.1% of the students became worse, comprising 73.7% of the boys and 31.7% of the girls.32.1% of the students were assessed as being in poor condition at grade 9, though they were assessed as being in good condition at grade 7.60.9% of the students at grade 9 remained poor condition for the two years.
In conclusion, the results indicate that the periodontal conditions worsen with increased grade. This suggests that early oral hygiene instruction should be individually given to students who, through screening, are assessed as having poor oral health, in order to cure them of and protect them from periodontal diseases.
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© The Japanese Society of Pediatric Dentistry
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