Abstract
The purpose of this study was to investigate the epidemiological characteristics of gingival inflammation and the factors influencing its prevalence in first-year junior high school students. A survey of gingival inflammation evaluated by PMA index was conducted on 731 students of 6 schools in Tokushima Prefecture and the influencing factors obtained by questionnaire were analyzed.The results were summarized as follows.1. The prevalence of gingival inflammation was 96.4% and the PMA index showed a significant relationship to the plaque accumulation (DI-M) or calculus deposition.2. The average PMA index of boys was higher than that of girls statistically.3. The value of PMA index was strongly related to all factors of habitual tooth-bushing and “Regularity of between-meal eating”.4. Using multivariant analysis, it was found that the factors related to PMA index were “Frequency of tooth-brushing” in boys and “Mouth-cleaning after between-meal eating” as well as “Frequency of tooth-brushing” in girls.
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