title: A 5-year follow-up comparative analysis of the efficacy of various osseointegrated dental implant systems: a systematic review of randomized controlled clinical trials.
abstract: OBJECTIVE
  To test the null hypothesis that there is no difference in failure rates between various root-formed osseointegrated dental implant systems after 5 years of loading.
  
  
  METHODS
  A search was conducted for all randomized controlled clinical trials (RCTs) comparing different implant systems with a follow-up of 5 years. The Cochrane Oral Health Group's Trials Register, CENTRAL, MEDLINE, and EMBASE were searched. Several dental journals were also searched by hand. Written contacts were established with authors of the identified RCTs and with more than 55 oral implant manufacturers and personal contacts to identify unpublished RCTs. No language restriction was applied. The last electronic search was conducted on February 1, 2005. Screening of eligible studies, quality assessment, and data extraction were conducted in duplicate. Results were expressed as random effect models using weighted mean differences for continuous outcomes and relative risk for dichotomous outcomes with 95% confidence intervals.
  
  
  RESULTS
  Ten RCTs were identified. Four of these RCTs, reporting results from a total of 204 patients, were considered suitable for inclusion. Six different implant types were compared. On a per-patient rather than a per-implant basis, there were no statistically significant differences, with the exception of more marginal bone loss around early loaded Southern implants when compared to early loaded Steri-Oss implants (mean difference -0.35 mm; 95% CI -0.70 to -0.01). However, the difference disappeared in the meta-analysis.
  
  
  CONCLUSIONS
  There were no clinical differences among implant systems. However, these findings are based on only 4 RCTs with few participants. More RCTs should be conducted with larger patient samples.
authors.affiliation: Oral and Maxillofacial Surgery, School of Dentistry, University of Manchester, Higher Cambridge Street, Manchester M15 6FH, United Kingdom. espositomarco@hotmail.com
authors.forename: Marco
authors.initials: M
authors.lastname: Esposito
authors.forename: Maria Gabriella
authors.initials: MG
authors.lastname: Grusovin
authors.forename: Paul
authors.initials: P
authors.lastname: Coulthard
authors.forename: Peter
authors.initials: P
authors.lastname: Thomsen
authors.forename: Helen V
authors.initials: HV
authors.lastname: Worthington
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019232:Dental Restoration Failure; D005500:Follow-Up Studies; D006801:Humans; D016348:Osseointegration; D011785:Quality Assurance, Health Care; D016032:Randomized Controlled Trials as Topic
chemical_list: D015921:Dental Implants