Correlation between circadian rhythm and rapid palatal expansion

VernacularTitle:加力时间对快速扩弓效果的影响初探
Author: Yu-Ming BAI ¹ ; Jing MAO
Author Information

1. 华中科技大学同济医学院附属同济医院
Keywords: Orthodontics,corrective; Circadian rhythm; Rapid palatal expansion
From: Chinese Journal of Stomatology 2010;45(11):655-658
CountryChina
Language:Chinese
Abstract: Objective To investigate the correlation between circadian rhythm and rapid palatal expansion (RPE). Methods One hundred and eleven consecutive patients (55 males and 56 females)using the same rapid palatal expansion devices were included in the study. The mean age of males was ( 11.2 ± 2. 1 ) years and the mean age of the females was ( 11.4 ± 2. 7 ) years, According to the activation time (0, 3, 6, 9, 12, 15, 18 and 21 o'clock), the patients were divided into eight groups. The data were analyzed using Halberg methods for cosinor-rhythmometry and t test Results The results of the tooth movement in eight different groups fitted to a cosine curve. The acrophase and bathyphase appeared at 21 and 9 o'clock, respectively. Conclusions The human circadian rhythm could affect the rapid palatal expansion. This study demonstrated that the best activation time for patients with RPE was around 21 o'clock.