title: Mandibular overdentures supported by two Brånemark, IMZ or ITI implants: a ten-year prospective randomized study.
abstract: OBJECTIVE
  The aim of this prospective comparative study was to evaluate the survival rate, condition of peri-implant tissues, patient satisfaction and surgical and prosthetic aftercare of the IMZ-implant system (two-stage cylinder type), the Brånemark-implant system (two-stage screw type) and the ITI-implant system (one-stage screw type) supporting a mandibular overdenture during a 10-year follow-up period.
  
  
  METHODS
  Three groups of 30 edentulous patients were treated with two endosseous implants in the interforaminal region of the mandible. Clinical and radiographic parameters were evaluated immediately after completion of the prosthetic treatment and after 1, 5 and 10 years of functional loading. Prosthetic and surgical aftercare was scored during the evaluation period, as well as patient satisfaction.
  
  
  RESULTS
  The 10-year survival rate was 93% for the IMZ group, 98% for the Brånemark group and 100% for the ITI group (IMZ<ITI, p<0.05). Mean marginal bone loss was limited over a period of 10 years. No differences in satisfaction and aftercare were observed between the groups.
  
  
  CONCLUSIONS
  It is concluded that two implants placed in the interforaminal region, connected with a bar, supply a proper base for the support of a mandibular overdenture in the edentulous patient. After10 years, no relevant changes had developed between the three implant systems.
authors: Oral and Maxillofacial Surgery, University Medical Center Groningen, Groningen, The Netherlands. h.j.a.meijer@kchir.umcg.nl
authors: Henny J A
authors: HJ
authors: Meijer
authors: Gerry M
authors: GM
authors: Raghoebar
authors: Rutger H K
authors: RH
authors: Batenburg
authors: Arjan
authors: A
authors: Vissink
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D003774:Dental Plaque Index; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D003828:Denture, Overlay; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000534:rehabilitation; D008297:Male; D008334:Mandible / Q000601:surgery; D008875:Middle Aged; D017060:Patient Satisfaction; D010512:Periodontal Index; D011446:Prospective Studies; D011859:Radiography; D011795:Surveys and Questionnaires; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants