[Chronobiology of pulp sensibility in young people]

To explore the biological clock of pulp sensibility in young people so as to enrich the theory of pulp-chronobiology and conduce to clinical diagnosis and the treatment of pulposis.

40 healthy young volunteers (20 males and 20 females) were examined. Pulp sensibility test was performed using the pulp sensibility tester produced in France. Pulp sensibility reading was obtained at each 4 hours from 8:00 a.m. till next 8:00 a.m., thus there were totally seven time-pints in 24 hours. And the readings were averaged.

The pulp sensibility data of every volunteer were analyzed by methods for cosinor-rhythmometry, and significant difference (P<0.05) was found. The acrophase and bathyphase appeared at 0:00 and 12:00 separately. We did not find significant difference of the mesor, amplitude and phase between young males and females (P> 0.05).

Circadian rhythm is demonstrated in thepulp sensibility data of young people; the highest pulp sensibility is at 12:00 while the lowest is at 0:00.