title: Immediate and delayed implant placement into extraction sockets: a 5-year report.
abstract: BACKGROUND
  As a complement to the earlier reported 3-year results from a prospective multicenter study of immediate and delayed placement of implants into fresh extraction sockets, the 5-year results are reported.
  
  
  OBJECTIVE
  The purpose of this 5-year report was to evaluate the immediate and long-term success of implants placed into fresh extraction sockets, with respect to implant size and type, bone quality and quantity, implant position, initial socket depth, and reason for tooth extraction.
  
  
  METHODS
  This paper presents the 5-year results of the original 12 centers that participated with 143 consecutively included patients. A total of 264 implants were placed either immediately after tooth extraction or after a short soft-tissue healing time (3-5 weeks). The patients were divided into five subgroups, depending on the type of insertion method used.
  
  
  RESULTS
  The outcome demonstrated that the cumulative implant survival rate after 5 years of loading has not changed and remains 92.4% in the maxilla and 94.7% in the mandible. No difference in failure rates can be seen between the groups when relating the failures to insertion method.
  
  
  CONCLUSIONS
  This prospective study demonstrated that placing Brånemark implants into fresh extraction sites can be successful over a period of 5 years of loading. One of the outcomes of the study shows that there is a clinical correlation between implant failure and periodontitis as a reason for tooth extraction, even if it is difficult to give it a casual association. It can be hypothesized that periodontitis affected tissues might have a negative local influence because of the presence of infrabony defects that could possibly increase the gap between bone and implant or jeopardize achievement of primary stability.
authors.affiliation: Kliniek voor Parodontologie, Amsterdam, The Netherlands.
authors.forename: G
authors.initials: G
authors.lastname: Polizzi
authors.forename: U
authors.initials: U
authors.lastname: Grunder
authors.forename: R
authors.initials: R
authors.lastname: Goené
authors.forename: N
authors.initials: N
authors.lastname: Hatano
authors.forename: P
authors.initials: P
authors.lastname: Henry
authors.forename: W J
authors.initials: WJ
authors.lastname: Jackson
authors.forename: K
authors.initials: K
authors.lastname: Kawamura
authors.forename: F
authors.initials: F
authors.lastname: Renouard
authors.forename: R
authors.initials: R
authors.lastname: Rosenberg
authors.forename: G
authors.initials: G
authors.lastname: Triplett
authors.forename: M
authors.initials: M
authors.lastname: Werbitt
authors.forename: B
authors.initials: B
authors.lastname: Lithner
mesh_terms: D015519:Bone Density; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D016348:Osseointegration; D010518:Periodontitis / Q000150:complications; D016016:Proportional Hazards Models; D011446:Prospective Studies; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D014081:Tooth Extraction; D020390:Tooth Socket / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome; D014945:Wound Healing
chemical_list: D015921:Dental Implants