title: [Changes of orthodontic tooth in different healing extraction sites].
abstract: OBJECTIVE
  To compare the canines root resorption and alveolar bone height when they were moved into different healing extraction sites.
  
  
  METHODS
  Twenty patients with overjet were treated by extracting the maxillary first premolars. By random determination, distalization of different lateral upper canines started after 1 week and 12 weeks. Every 4 weeks use a force of approximately 100 g to distalize the canines. The experiment was ended when bilateral canines have contacted with the second maxillary bicuspids completely. Periapical radiography of the canine in the end of the distalization was made.
  
  
  RESULTS
  External apical root resorption and alveolar bone height of the canines have no significant difference between the different healing extraction sites.
  
  
  CONCLUSIONS
  Tooth extraction site healing has not much effect on the canine external apical root resorption and alveolar bone height, when it was distalization. In practice, tooth movement into extraction sites can start early.
authors.affiliation: Dept. of Orthodontics, Guanghua College of Stomatology, SUN Yat-sen University, Guangzhou 510055, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Wang
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Xiong
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D001641:Bicuspid; D003481:Cuspid; D006801:Humans; D012391:Root Resorption; D014081:Tooth Extraction; D014087:Tooth Movement Techniques