title: Interventions for replacing missing teeth: different types of dental implants.
abstract: BACKGROUND
  Dental implants are available in different materials, shapes and with different surface characteristics. In particular, numerous implant surface modifications have been developed for enhancing clinical performances.
  
  
  OBJECTIVE
  To test the null hypothesis of no difference in clinical performance between various root-formed osseointegrated implant types.
  
  
  METHODS
  The Cochrane Oral Health Group Specialised Trials Register, The Cochrane Controlled Trials Register, MEDLINE and EMBASE were searched. Hand searching included several dental journals. Bibliographies of relevant clinical trials and review articles were checked for studies outside the handsearched journals. In addition, authors of all identified trials and fifty-five oral implant manufacturers were contacted to find unpublished or ongoing RCTs. Two extensive personal libraries (ME and AJ) were consulted. The last electronic search was conducted 8th May 2002.
  
  
  METHODS
  All randomised controlled trials of oral implants comparing implants with different materials, shapes and surface properties having a follow-up of at least one year.
  
  
  METHODS
  Data were independently extracted, in duplicate, by two reviewers (ME & HW). Authors were contacted for details of randomisation and withdrawals and a quality assessment was carried out. The Cochrane Oral Health Group's statistical guidelines were followed.
  
  
  RESULTS
  Thirty publications, representing 13 different RCTs, were identified. Five of these RCTs (seven publications), which reported results from a total of 326 patients, were suitable for inclusion in the review. Six implant systems were compared: Astra, Branemark, IMZ, ITI, Steri-Oss and Southern with a follow-up ranging from one to three years. All implants were made in commercially pure titanium and had different shapes and surface preparations. On a patient rather than per implant basis there were no statistically significant differences for failures and marginal bone level changes on intra-oral radiographs between various implant systems.
  
  
  CONCLUSIONS
  There was no evidence that any of the implant systems evaluated was superior to the other. However, these findings are based on a few RCTs all having short follow-up periods and few participants. More RCTs should be conducted, with follow-up of at least five years and including a sufficient number of patients, to detect a true difference if any exists. Such trials should be reported according to the CONSORT guidelines (http://www.consort-statement.org/).
authors.affiliation: Department of Biomaterials and Department of Prosthetic Dentistry/Dental Science, The Sahlgrenska Academy at Goteborg University, PO Box 412, Medicinaregatan 8B, Goteborg, Sweden, SE-40530. marco.esposito@biomaterials.gu.se
authors.forename: M
authors.initials: M
authors.lastname: Esposito
authors.forename: P
authors.initials: P
authors.lastname: Coulthard
authors.forename: H V
authors.initials: HV
authors.lastname: Worthington
authors.forename: A
authors.initials: A
authors.lastname: Jokstad
authors.forename: A
authors.initials: A
authors.lastname: Wennerberg
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D006801:Humans; D016032:Randomized Controlled Trials as Topic
chemical_list: D015921:Dental Implants