title: Osseointegration at implants placed into delayed reimplanted roots: an experimental study in dogs.
abstract: OBJECTIVE
  To evaluate peri-implant bone repair of implants placed into the roots of delayed reimplanted teeth, in a process of ankylosis and external replacement resorption.
  
  
  METHODS
  The third and fourth mandibular premolars of four (4) beagle dogs were used as experimental sites. The study was divided into three stages: stage 1 - endodontic and extraction/reimplantation session, stage 2 - decrowning session and stage 3 - implant placement. Two groups were identified: (I) immediate implants, including implants installed in fresh extraction sockets of the distal roots, and (II) experimental implants, including implants installed into the retained ankylotic mesial roots. In each group, 16 implants were planned to be inserted, but only 9 immediate implants and 12 experimental implants were used for analyses. Implants were intended to heal in a submerged mode. After 4 months of healing, the animals were sacrificed and ground sections were obtained for histomorphometric evaluation.
  
  
  RESULTS
  Eleven of the twelve implants in the experimental group were found successful regarding clinical and radiographic aspects. For immediate implants, a lower BIC% was found at the coronal portion (BIC% 1 = 42.2%) compared with the three most coronal threads portion (BIC% 2 = 55.1). Also, experimental implants presented a lower BIC% at the coronal portion (BIC% 1 = 36.9%) compared with the three most coronal threads portion (BIC% 2 = 45.3).
  
  
  CONCLUSIONS
  Comparison between groups showed a higher degree of BIC% and mineralization in immediate group compared with experimental group. The differences, however, did not yield statistical significance.
authors.affiliation: Oral Surgery and Implantology, EAP- Goiás Dentistry Improvement School, Goiania, Goiás, Brazil.
authors.forename: Leandro
authors.initials: L
authors.lastname: de Carvalho Cardoso
authors.forename: Wilson Roberto
authors.initials: WR
authors.lastname: Poi
authors.forename: Daniele
authors.initials: D
authors.lastname: Botticelli
authors.forename: Idelmo Rangel Garcia
authors.initials: IR
authors.lastname: Junior
authors.forename: Fabio
authors.initials: F
authors.lastname: Pantani
authors.forename: Cassiano Costa Silva
authors.initials: CC
authors.lastname: Pereira
mesh_terms: D000818:Animals; D001641:Bicuspid / Q000601:surgery; D015921:Dental Implants; D004285:Dogs; D057893:Immediate Dental Implant Loading; D020007:Implants, Experimental; D008297:Male; D008334:Mandible / Q000000981:diagnostic imaging / Q000601:surgery; D016348:Osseointegration / Q000502:physiology*; D011859:Radiography; D012092:Replantation; D014092:Tooth Root / Q000000981:diagnostic imaging / Q000601:surgery*; D014945:Wound Healing / Q000502:physiology
chemical_list: D015921:Dental Implants
keywords: animal study; bone healing; dental ankylosis; immediate implant; implant dentistry; osseointegration; reimplantation; tooth extraction