title: A retrospective evaluation of 1,387 single-tooth implants: a 6-year follow-up.
abstract: BACKGROUND
  The aim of this study was to evaluate the overall survival rate and factors that affect the clinical outcome of 1,387 consecutively placed implant-supported single restorations up to 6 years.
  
  
  METHODS
  During 6 years (1999 to 2005), 1,387 implants were placed in 1,215 subjects (1,073 males and 142 females) who required single-tooth replacements. The average time from implant placement was 2.7 +/- 3.27 years. Implants were mostly placed in the maxillary premolar area (39.5%) followed by the anterior maxillary area (28.7%). Implant survival and location, need for bone augmentation, and implant dimensions were recorded and analyzed.
  
  
  RESULTS
  Failed implants totaled 96, resulting in an overall survival rate of 93.1%. The vast majority of failures (94.8%) occurred during the first year following implant placement. Bone augmentation was performed in 9.7% of the implants with a 92.5% survival rate, similar to the survival rate of non-augmented areas (93.1%; P = 0.79). The average implant length was 13.3 mm, ranging from 8 to 16 mm. Longer implants (> or =11 mm) showed similar survival rates as implants <11 mm (93.2% versus 90.2%, respectively; P = 0.4). Implant width ranged between 3.25 to 5 mm (mean 3.9), with no effect on implant survival (P = 0.43). There was a significant difference in implant survival according to the anatomic zone of implant placement (P = 0.0075). The maxillary premolar area showed the highest survival rate (96.2%).
  
  
  CONCLUSIONS
  Implant-supported single-tooth replacement is a predictable procedure with good survival rates up to 6 years.
authors.affiliation: Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. liranl@post.tau.ac.il
authors.forename: Liran
authors.initials: L
authors.lastname: Levin
authors.forename: Paul
authors.initials: P
authors.lastname: Sadet
authors.forename: Yoav
authors.initials: Y
authors.lastname: Grossmann
mesh_terms: D000328:Adult; D001641:Bicuspid; D015331:Cohort Studies; D019250:Dental Implants, Single-Tooth / Q000706:statistics & numerical data; D017268:Dental Prosthesis Retention / Q000706:statistics & numerical data; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation* / Q000601:surgery; D008297:Male; D008334:Mandible; D008437:Maxilla; D008875:Middle Aged; D016348:Osseointegration; D012189:Retrospective Studies; D013997:Time Factors; D016896:Treatment Outcome