title: Influence of implants with different sizes and configurations installed immediately into extraction sockets on peri-implant hard and soft tissues: an experimental study in dogs.
abstract: OBJECTIVE
  To study the influence on the healing of soft and hard peri-implant tissues when implants of different sizes and configurations were installed into sockets immediately after tooth extraction.
  
  
  METHODS
  Transmucosal cylindrical implants, 3.3 mm in diameter in the control sites, and conical 5 mm in diameter in the test sites, were installed into the distal socket of the fourth mandibular premolars in dogs immediately after tooth extraction. After 4 months, the hard and soft tissue healing was evaluated histologically.
  
  
  RESULTS
  All implants were integrated in mineralized mature bone. Both at the test and control sites, the alveolar crest underwent resorption. The buccal bony surface at the implant test sites (conical; 3.8 mm) was more resorbed compared with the control sites (cylindrical; 1.6 mm). The soft tissue dimensions were similar in both groups. However, in relation to the implant shoulder, the peri-implant mucosa was located more apically at the test compared with the control sites.
  
  
  CONCLUSIONS
  The present study confirmed that the distance between the implant surface and the outer contour of the buccal alveolar bony crest influenced the degree of resorption of the buccal bone plate. Consequently, in relation to the implant shoulder, the peri-implant mucosa will be established at a more apical level, if the distance between the implant surface and the outer contour of the alveolar crest is small.
authors.affiliation: UNESP-Faculty of Dentistry of Araçatuba, São Paulo State University, São Paulo, Brazil.
authors.forename: Marco
authors.initials: M
authors.lastname: Caneva
authors.forename: Daniele
authors.initials: D
authors.lastname: Botticelli
authors.forename: Fabio
authors.initials: F
authors.lastname: Rossi
authors.forename: Leandro Carvalho
authors.initials: LC
authors.lastname: Cardoso
authors.forename: Fabio
authors.initials: F
authors.lastname: Pantani
authors.forename: Niklaus P
authors.initials: NP
authors.lastname: Lang
mesh_terms: D000539:Alveolar Process / Q000601:surgery*; D000818:Animals; D003758:Dental Implantation, Endosseous / Q000379:methods*; D019250:Dental Implants, Single-Tooth; D017267:Dental Prosthesis Design; D004285:Dogs; D016348:Osseointegration; D018709:Statistics, Nonparametric; D013524:Surgical Flaps; D014081:Tooth Extraction; D020390:Tooth Socket / Q000601:surgery*; D014945:Wound Healing