The influence between the recovery of the occlusal support after tooth extraction and the chronic stress

臼齿拔除引起的咬合障碍或咬合不协调加速了空间学习记忆功能的损害。可能是拔牙导致的咬合支持丧失导致了空间记忆的衰退，而戴上实验义齿后咬合支持的恢复控制了空间记忆的衰退。同时，我们认为丧失咬合支持可能导致海马锥体细胞密度下降。与慢性应激组相比，对照组、戴假牙组和拔牙组之间无显著差异。在佩戴实验义齿时不处于应激状态，但不接受因咬合不协调引起的慢性应激。

Occlusal disturbance caused by the extraction of molar teeth or occlusal disharmony accelerate impairment of spatial learning and memory. It is possible that the loss of occlusal support by teeth extraction caused adecline of the spatial memory, and the recovery of occlusal support wearing the experimental denture controlled a decline of the spatial memory. Also, it was suggested that the loss of occlusal support caused a decline of hippocampus pyramidal cell density. Compared to chronic stress, it was not significant difference between control, denture-wearing, and tooth extraction groups. While wearing the experimental denture wasn’t under stress, the chronic stress caused by occlusal disharmony was not accepted.