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Purpose: This study observed the daily change of the stress response caused by experimental occlusal interference. Methods: 11-week-old male Wistar rats were used and divided into two groups: the control group and the occlusal interference group. Each group consisted of 36 rats. Six-session experiments were carried out over a period of 14 days. The concentration of corticosterone in blood was analyzed. Applying in situ hybridization, the stress-induced c-fos mRNA in the brain was observed. The regions of observation in the brain were amygdaloid, piriform cortex, hippocampus, cingulate cortex, paraventricular nucleus of hypothalamus, locus coeruleus, raphe magnus nucleus, and central gray. Results: Compared with the control group, c-fos mRNA expressions increased significantly in the occlusal interference group throughout the observation period. c-fos mRNA expressions were consistently manifested in the regions of the input system of the brain, and c-fos mRNA expressions in the regions of the output system of the brain adapted to the exprimental occlusal interference stress. The concentration of corticosterone in blood adapted to stress by experimental occlusal interference. Conclusions: The stress caused by experimental occlusal interference is a stress with physical and psychological factors, and the stress responss did not disappear when the experimental occlusal interference was worn.

Daily Change of Stress Induced Expression of c-fos mRNA in Rat Brain by Experimental Occlusal Interference