title: A retrospective analysis of replacing dental implants in previously failed sites.
abstract: OBJECTIVE
  Overall first-year failure rate for dental implants may reach 3%-8% as the result of various complications. Accordingly, reimplantation accounts for an ever-growing portion of clinic's practice. The purpose of the present study was to evaluate the survival rate of dental implants that were performed in sites where failed implants were previously removed and to evaluate the factors affecting outcome.
  
  
  METHODS
  Three certified oral and maxillofacial surgeons inserted 144 implant replacement in previously failed sites in 144 patients (1994-2009). Clinical and epidemiologic data were collected retrospectively and analyzed regarding survival rates.
  
  
  RESULTS
  Survival rate of the implants replacing previously failed ones was 93% (133/144). A third placement in the same site was performed in 7 of 11 patients with a survival rate of 85% (6/7) up to the last follow-up. No correlations were found between replaced implant failures with any of the parameters examined.
  
  
  CONCLUSIONS
  Within the limits of the present study, it can be concluded that a previous implant failure should not discourage practitioners from a second or even a third attempt.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Maurice and Gabriela Goldschleger School of Dental Medicine, Tel-Aviv University, Tel Aviv, Israel. ofer.mardinger@gmail.com
authors.forename: Ofer
authors.initials: O
authors.lastname: Mardinger
authors.forename: Yonatan
authors.initials: Y
authors.lastname: Ben Zvi
authors.forename: Gavriel
authors.initials: G
authors.lastname: Chaushu
authors.forename: Josep
authors.initials: J
authors.lastname: Nissan
authors.forename: Yifat
authors.initials: Y
authors.lastname: Manor
mesh_terms: D000328:Adult; D000368:Aged; D000540:Alveolar Ridge Augmentation / Q000706:statistics & numerical data; D003758:Dental Implantation, Endosseous / Q000379:methods* / Q000706:statistics & numerical data; D015921:Dental Implants / Q000706:statistics & numerical data; D017267:Dental Prosthesis Design / Q000145:classification; D019094:Dental Prosthesis, Implant-Supported / Q000145:classification; D019232:Dental Restoration Failure / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006304:Health Status; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology; D012086:Reoperation; D012189:Retrospective Studies; D012907:Smoking; D016019:Survival Analysis; D013997:Time Factors; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants