title: [Effects of estrogen on experimental tooth movement in osteoporosis rats].
abstract: OBJECTIVE
  To investigate the effects of estrogen on the orthodontic tooth movement and alveolar bone in osteoporosis rats.
  
  
  METHODS
  Thirty 3 month-old female sprague-dawley rats were divided randomly into three groups (control, osteoporosis and estrogen). In the three groups, the distances of tooth movement and the number of osteoclast were measured and compared. Histologic changes were observed.
  
  
  RESULTS
  Compared with the control group, in first month, the distances of orthodontic tooth movement was increased by 43.3% in osteoporosis group and by 30.7% in estrogen group; the number of osteoclast was increased by 64.4% and by 32.9% respectively. In second month, the distances were increased by 68.5% in osteoporosis group and by 24.9% in estrogen group; the number of osteoclast was increased by 68.7% and by 15.0% respectively. In addition, estrogen promoted the alveolar bone-forming and inhibited the bone resorption.
  
  
  CONCLUSIONS
  It is suggested that the estrogen may affect the rate of orthodontic tooth movement on postmenopausal osteoporosis patient.
authors.affiliation: Department of Orthodontic, College of Stomatology, Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Z
authors.initials: Z
authors.lastname: Jin
authors.forename: Y
authors.initials: Y
authors.lastname: Ding
authors.forename: X
authors.initials: X
authors.lastname: Li
mesh_terms: D000818:Animals; D004967:Estrogens / Q000627:therapeutic use*; D005260:Female; D010010:Osteoclasts / Q000187:drug effects; D010024:Osteoporosis / Q000188:drug therapy*; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D014087:Tooth Movement Techniques
chemical_list: D004967:Estrogens