title: [Immediate microcirculation reaction of periodontal ligaments to experimental intrusion of dog teeth].
abstract: OBJECTIVE
  The purpose of this study is to investigate the immediate microcirculation reaction of periodontal ligaments to experimental intrusion of dog teeth.
  
  
  METHODS
  The forth premolar was chosen as the anchor tooth to intrude the second premolar using an intrusion circle loop. All tissue sections were observed and analyzed using the ink perfusion technique and an image analysis apparatus.
  
  
  RESULTS
  The microvascular pattern of periodontal ligaments was changed after the maxillary second premolar had been intruded for 2 hours with 100 g of force. The vascular diameter and volume density diminished, but the vascular number and some parts of the microvasculature, especially capillaries were compressed due to the blood escaping from the periodontal ligament. It showed that the initial effect of 100 g of intrusive force caused adaptable changes in the microcirculation of periodontal ligaments, but no significant impediment of blood flow occurred.
  
  
  CONCLUSIONS
  During the tooth intrusion with 100 g of force, a suitable microenvironment was established for the benefit of the survival of periodontal ligaments, which could avoid overloads imposed on the periodontal ligament and decreased the injury of periodontal tissue. It elucidates that the microcirculation of periodontal ligaments plays an important role in the protection of the periodontal tissue, in terms of biological function.
authors.affiliation: Stomatology Hospital, Xiamen.
authors.forename: J
authors.initials: J
authors.lastname: Shi
authors.forename: X
authors.initials: X
authors.lastname: Cheng
authors.forename: J
authors.initials: J
authors.lastname: Yao
authors.forename: Y
authors.initials: Y
authors.lastname: Guan
authors.forename: H
authors.initials: H
authors.lastname: He
authors.forename: Y
authors.initials: Y
authors.lastname: Peng
mesh_terms: D000818:Animals; D004285:Dogs; D008297:Male; D008833:Microcirculation / Q000473:pathology / Q000502:physiology; D008963:Molar; D009970:Orthodontics; D010513:Periodontal Ligament / Q000098:blood supply*; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques