Circadian Variation of Pulp Sensitivity for Acute Pulpitis

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  • 急性歯髄炎における歯痛発症の日内変動

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Knowledge of circadian variations has led to a better understanding of the time-of-day dependent results of clinical tests for various diseases and the effects of medications. The highest intensity of a toothache associated with acute pulpitis tends to occur at night, but little is known about the relationship between biological rhythms and pulp sensitivity associated with acute pulpitis. This study investigated the circadian variation of pulp sensitivity associated with acute pulpitis. The sex, age, dentition, pain features, time of onset and daily routines (hour of rising, meal times, time of shower or bathing, and hour of going to bed) in 73 patients with toothache caused by acute pulpitis were determined by interview after they provided informed consent. The chi-square test and a regression analysis were used for statistical analysis. The majority of the patients with acute pulpitis experienced painful onset of the toothache during the period from evening to midnight and from 7:00 AM to 8:00 AM. No correlation was found between the time of onset and the daily routine in the patients that experienced onset of toothache between evening to midnight, while there was an interesting correlation between the onset of pain and the hour of rising in patients with onset of toothache from 7:00 AM to 8:00 AM. On the other hand, there were no correlations with sex, age and dentition in any of the patients with acute pulpitis. These results suggest that there is a circadian variation in patients diagnosed as acute pulpitis.

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