The diagnostic criteria for oral hypofunction are constant regardless of the individual’s age. Therefore, middle-aged individuals are rarely diagnosed with decreased oral function, despite the lack of age-appropriate oral function. In addition, there is a problem that super-aged people are generally diagnosed with decreased oral function even at the “oral age” younger than the actual age. This study proposes the oral function age index. It correlates oral function with age and provides age-specific guidance. A total of 319 patients (131 males, 188 females, average age 75.5 years) visited our department complaining of discomfort in oral function. Patient records were obtained from 13 universities that participated in this project commissioned by the Ministry of Health, Labor and Welfare. Correlation coefficients and regression lines were calculated from the results of the oral hypofunction examinations and age-based scatter plots. The technique for calculating “the corresponding age” was developed based on the differences in the examination values among individuals: the difference is based on the average value of the age obtained from each examination item. The occlusal force, number of remaining teeth, oral diadocokinesis (pa, ta, ka), tongue pressure, and masticatory ability were negatively correlated with the real age. A formula to determining the oral functional age from the examination results was developed in Microsoft Excel using these items. This study presents an easy method that can be used to calculate the oral functional age of an individual. As a result, the examination item points became clear, indicating that the guidance that was memorable for the patient was established, which contributed to the improvement and increased in the number of the oral hypofunction examinations.
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