Evaluation of Remaining and Sound Teeth of Office Workers with Percentile Parameter

Abstract

The purpose of this study was to determine the percentiles of remaining and sound teeth and to evaluate utilization of the percentile-curves for oral health instruction in office workers. Dental examination was performed on 3,195 males from 23 to 64 years of age and 1,909 females from 20 to 49 years of age in 1992. The 50 th percentile-value of males' remaining teeth was 27 at 40 years and 25 at 60 years. That of the females was 27 at 40 years old. The 50 th percentile-value of males' sound teeth was 15 at 40 years and 13 at 60 years. That of the females was 13 at 40 years old. The 90 th and 97 th percentile-curves of males' remaining teeth fell under 20 teeth after 55 years of age. The 75 th percentile-curve of males' and females' remaining teeth in the survey was equal to the 50 th percentile-curve drawn by the survey of the Tokyo Metropolitan Government (Oral Health Status of Adult Population in Tokyo). Oral health status of these subjects was better than that of the population in Tokyo. Substantial agreement between the oral examination and self-reported questionnaire was 44% in remaining teeth and 13% in sound teeth. This result shows that oral health professionals' advice is needed for understanding of percentile-curves of sound teeth. These results suggested that the percentile-curves of remaining teeth were not only useful indicators for assessment of the population, but also of visual utility for individual oral health instruction in office workers.