title: [The post-injury regenerating ability of temporomandibular joint of rats exposed to the repeated + Gz forces].
abstract: OBJECTIVE
  To observe the post-injury regenerating ability of temporomandibular joint of rats exposed to the repeated + Gz forces.
  
  
  METHODS
  One hundred and eight male rats were randomly assigned to 9 groups, with 12 rats in each group. Group A was normally fed serving as the blank control group. Group B was only fixed with rat-kept devices for 5 minutes as the fixed control group. Group C was borne +1 Gz for 5 minutes. In the same position as group C, group D, E, F, G, H and I were repeatedly exposed to +10 Gz for 30 seconds each time with 5 times a day and +1 Gz for 1 minutes as a interval. The 6 groups were treated in the condition above for 4 days a week and 4 weeks in total. The rats in group A, B, C and D were killed on the next day after the centrifuge. The rats in group E, F, G, H and I were killed at 1, 2, 4, 8 and 12 weeks after the centrifuge, respectively. After the rats were killed, temporomandibular joint were taken for observation under optical microscope, scanning electron-microscope (SEM) and transmission electron-microscope (TEM).
  
  
  RESULTS
  There was no significant difference observed in group A, B and C. But in group D, E, F, G, H and I pathologic injuries and self-regeneration were seen in TMJ in different degrees.
  
  
  CONCLUSIONS
  The injury of TMJ could regenerate gradually with time.
authors.affiliation: Department of Scientific Research, General Hospital of PLA, Beijing 100853, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Ma
authors.forename: Min
authors.initials: M
authors.lastname: Hu
authors.forename: Zhen-yu
authors.initials: ZY
authors.lastname: Sun
authors.forename: Hua
authors.initials: H
authors.lastname: Chen
authors.forename: Chun-hai
authors.initials: CH
authors.lastname: Li
authors.forename: Zhong-chen
authors.initials: ZC
authors.lastname: Xie
mesh_terms: D000054:Acceleration / Q000009:adverse effects*; D000818:Animals; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D013704:Temporomandibular Joint / Q000293:injuries* / Q000473:pathology* / Q000648:ultrastructure