title: An experimental model for studies on delayed tooth replantation and ankylosis in rabbits.
abstract: OBJECTIVE
  To develop an experimental in vivo model to study dentoalveolar ankylosis and osseous replacement resorption after delayed replantation.
  
  
  METHODS
  The maxillary right incisors of eight rabbits were extracted and replanted, while the maxillary left incisors served as controls. A special technique for extraction was used, luxating the incisor laterally prior to extraction. Extra-oral root canal treatment was performed. In four of the eight replanted teeth, periodontal ligament was removed using gauze. All teeth were replanted after one-hour dry storage. A horizontal line was drilled on the labial enamel surface of the incisors to enable registration of possible subsequent infraposition. The rabbits were sacrificed after 1 week or 4 weeks, respectively. Percussion test of the teeth was carried out and infraposition was registered. Histological processing and evaluation were performed.
  
  
  RESULTS
  Percussion sound was normal after 1 week and high in the 4 week group; infraposition was noted in all replanted teeth in the 4-week group. Fusion between the bone and dentin was seen in some areas on the root already after 1 week, but there was little or no osseous replacement. Larger areas of ankylosis were seen in the 4-week group although not significant, but deeper progressive osseous replacement was noted in this group. There was no significant difference in ankylosis with regard to periodontal ligament removal or not. Pulp and periodontal tissues were normal in all control teeth.
  
  
  CONCLUSIONS
  The rabbit tooth model may be useful for experimental in-vivo studies on delayed replantation, subsequent ankylosis, osseous replacement and infraposition.
authors.affiliation: Department of Restorative Sciences, Faculty of Dentistry, Kuwait University, Kuwait, Kuwait.
authors.forename: Manal
authors.initials: M
authors.lastname: Maslamani
authors.affiliation: Department of Surgical Sciences, Faculty of Dentistry, Kuwait University, Kuwait, Kuwait.
authors.forename: Ala
authors.initials: A
authors.lastname: Almusawi
authors.affiliation: Department of Diagnostic Sciences, Faculty of Dentistry, Kuwait University, Kuwait, Kuwait.
authors.forename: Bobby
authors.initials: B
authors.lastname: Joseph
authors.affiliation: Kuwait Animal Resources Center - Health Sciences Center, Kuwait University, Kuwait, Kuwait.
authors.forename: Severino
authors.initials: S
authors.lastname: Gabato
authors.affiliation: Department of Surgical Sciences, Faculty of Dentistry, Kuwait University, Kuwait, Kuwait.
authors.forename: Lars
authors.initials: L
authors.lastname: Andersson
mesh_terms: D000818:Animals; D000844:Ankylosis; D023421:Models, Animal; D010513:Periodontal Ligament; D011817:Rabbits; D012391:Root Resorption; D020254:Tooth Ankylosis; D014090:Tooth Replantation; D014092:Tooth Root
keywords: ankylosis; delayed replantation; histology; rabbit; replacement resorption; tooth avulsion