title: Failure rates of short (≤ 10 mm) dental implants and factors influencing their failure: a systematic review.
abstract: OBJECTIVE
  The aim of this study was to evaluate the long-term failure rates of short dental implants (≤ 10 mm) and to analyze the influence of various factors on implant failure.
  
  
  METHODS
  The PubMed and Cochrane Library databases were consulted for follow-up studies published between the years 1980 and 2009. For those studies that met the inclusion and exclusion criteria, data concerning the number of implants (≤ 10 mm) placed and lost and any related risk factors were gathered in tables and subjected to analysis. Univariate and multivariate analyses were performed.
  
  
  RESULTS
  The heterogeneity and low quality of the included studies made meta-analysis impossible. A total of 35 human studies fulfilled the criteria. The studies included 14,722 implants, of which 659 failed. The total failure rate was 4.5%. The failure rates of implants with lengths of 6, 7, 7.5, 8, 8.5, 9, and 10 mm were 4.1%, 5.9%, 0%, 2.5%, 3.2%, 0.6%, and 6.5%, respectively. A majority (57.9%) of failures occurred before prosthesis connection. There was no statistically significant difference between the failure rates of short dental implants and standard implants or between those placed in a single stage and those placed in two stages (multivariate analysis). There was a tendency toward higher failure rates for the maxilla and for dental implants with a machined surface compared with the mandible and dental implants with a rough surface, respectively.
  
  
  CONCLUSIONS
  Among the risk factors examined, most failures of short implants can be attributed to poor bone quality in the maxilla and a machined surface. Although short implants in atrophied jaws can achieve similar long-term prognoses as standard dental implants with a reasonable prosthetic design according to this review, stronger evidence is essential to confirm this finding.
authors.affiliation: Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
authors.forename: Hua Ling
authors.initials: HL
authors.lastname: Sun
authors.forename: Cui
authors.initials: C
authors.lastname: Huang
authors.forename: Yan Ru
authors.initials: YR
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Shi
mesh_terms: D000704:Analysis of Variance; D015519:Bone Density; D015921:Dental Implants / Q000009:adverse effects*; D017267:Dental Prosthesis Design / Q000009:adverse effects*; D019232:Dental Restoration Failure; D006801:Humans; D016015:Logistic Models; D008334:Mandible; D008437:Maxilla; D012307:Risk Factors; D013499:Surface Properties
chemical_list: D015921:Dental Implants