title: Occlusal disharmony affects plasma corticosterone and hypothalamic noradrenaline release in rats.
abstract: Few neuro-endocrinological studies have examined the relationship between occlusal disharmony and stress. To determine the effect of occlusal disharmony on the central nervous system, we measured plasma corticosterone and extracellular noradrenaline in the vicinity of the hypothalamic paraventricular nucleus in rats both with and without incisal caps. After the caps were set, plasma corticosterone and extracellular noradrenaline levels gradually increased, reaching a peak at 8.5 and 6.5 hours, respectively, after which they decreased. Furthermore, plasma corticosterone and extracellular noradrenaline levels increased in a circadian fashion around the onset of the dark phase in rats without caps, but not in rats with caps. These results suggest that occlusal disharmony causes chronic stress in the rat.
authors.affiliation: Department of Pediatric Dentistry, Kagoshima University School of Dentistry, Kagoshima, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yoshihara
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: T
authors.initials: T
authors.lastname: Ogura
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002940:Circadian Rhythm; D003345:Corticosterone / Q000097:blood; D003769:Dental Occlusion, Traumatic / Q000150:complications*; D008297:Male; D009638:Norepinephrine / Q000378:metabolism; D010286:Paraventricular Hypothalamic Nucleus / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D018709:Statistics, Nonparametric; D013312:Stress, Physiological / Q000097:blood / Q000209:etiology* / Q000378:metabolism
chemical_list: D003345:Corticosterone; D009638:Norepinephrine