title: A prospective multicenter evaluation of 1,583 3i implants: 1- to 5-year data.
abstract: OBJECTIVE
  The purpose of this prospective multicenter study was to evaluate the efficacy of 3i threaded implants for the treatment of edentulous patients in a 1- to 5-year period. This article reports the total data and global results of 3 threaded designs of 3i implants: self-tapping, ICE, and Osseotite.
  
  
  METHODS
  A total of 1,583 implants (619 ICE, 545 Osseotite, and 419 self-tapping) were placed between 1995 and 1999 in 528 patients at 13 European clinical centers. The average age of the patients was 53.6 years. Clinical and radiographic evaluations were performed annually for up to 5 years.
  
  
  RESULTS
  Of the total implants, 707 were placed in the maxilla and 876 in the mandible. A total of 1,162 implants were placed in posterior segments. Forty-eight implants were lost to follow-up and 55 were failures. The most frequent prosthetic indication was the short-span fixed prosthesis (440 cases), followed by 172 single-tooth replacements, 56 long-span prostheses, and 4 overdentures. Radiographic evaluation after 6, 12, and 24 months of implant loading showed, respectively, mean crestal bone loss of 0.04 +/- 1.3 mm, 0.12 +/- 1.6 mm, and 0.2 +/- 1.7 mm. A cumulative survival rate of 96.5% was observed 5 years after implant placement, with 97.2% survival in the maxilla and 95.8% in the mandible. The survival rate was similar in anterior (96.7%) and posterior (96.5%) segments.
  
  
  CONCLUSIONS
  A total of 55 failures were reported in this study with 47 early failures and 8 late failures. The rate of late failures is of utmost importance for the restorative dentist.
  
  
  CONCLUSIONS
  This clinical study gives evidence of very high success rates using 3 threaded designs of 3i implants.
authors.affiliation: Department of Periodontology, Hopital Pitié-Salpêtrière, Paris, France. m.davarpanah@wanadoo.fr
authors.forename: Mithridade
authors.initials: M
authors.lastname: Davarpanah
authors.forename: Henry
authors.initials: H
authors.lastname: Martinez
authors.forename: Daniel
authors.initials: D
authors.lastname: Etienne
authors.forename: Ion
authors.initials: I
authors.lastname: Zabalegui
authors.forename: Paul
authors.initials: P
authors.lastname: Mattout
authors.forename: Fréderic
authors.initials: F
authors.lastname: Chiche
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Michel
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants / Q000009:adverse effects; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography; D013530:Surgical Wound Infection / Q000209:etiology
chemical_list: D015921:Dental Implants