title: A 10-year prospective study of ITI dental implants placed in the posterior region. I: Clinical and radiographic results.
abstract: OBJECTIVE
  To evaluate the long-term fixture success rate, crestal bone loss and peri-implant soft tissue parameters around ITI dental implants placed in the posterior region of partially edentulous patients.
  
  
  METHODS
  A total of 192 ITI dental implants were consecutively placed in premolars and molars of 83 partially edentulous patients admitted for treatment at Geneva Dental School. All implants were restored by means of ceramic-to-metal fused fixed partial dentures and single crowns. Patients were followed as part of a prospective longitudinal study focusing on implant success. Surgical, radiographic and clinical variables were collected at the 1-year recall after implant placement and at the most recent clinical evaluation.
  
  
  RESULTS
  The mean observation time was 6 years (range 5-10 years). Four implants failed, yielding a 10-year cumulative survival rate of 97.9%. The mean annual crestal bone loss was -0.04+/-0.2 mm. Hollow-cylinder implants displayed more crestal bone loss (-0.13+/-0.24 mm) than hollow-screw implants (-0.02+/-0.19 mm; P=0.032). Clinical parameters such as age, gender, implant length and bone quality did not affect crestal bone levels. Increase in recession depth (P=0.025) and attachment level (P=0.011) were significantly associated with crestal bone loss.
  
  
  CONCLUSIONS
  ITI dental implants placed in the posterior jaw demonstrate excellent long-term clinical success. Hollow-cylinder implants seem to display a higher risk for crestal bone loss. Recession depth and attachment levels appear to be good clinical indicators of peri-implant bone loss.
authors.affiliation: Department of Fixed Prosthodontics and Occlusion, Geneva Dental School, Geneva, Switzerland.
authors.forename: Rafael Juan
authors.initials: RJ
authors.lastname: Blanes
authors.forename: Jean Pierre
authors.initials: JP
authors.lastname: Bernard
authors.forename: Zulema Maria
authors.initials: ZM
authors.lastname: Blanes
authors.forename: Urs Christoph
authors.initials: UC
authors.lastname: Belser
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging / Q000209:etiology*; D000704:Analysis of Variance; D001641:Bicuspid; D003758:Dental Implantation, Endosseous / Q000295:instrumentation / Q000379:methods*; D019250:Dental Implants, Single-Tooth / Q000009:adverse effects*; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000000981:diagnostic imaging / Q000534:rehabilitation / Q000601:surgery; D008297:Male; D008875:Middle Aged; D008963:Molar; D010512:Periodontal Index; D011446:Prospective Studies; D011859:Radiography; D012737:Sex Factors; D016896:Treatment Outcome