Ten-year survival rates of fixed prostheses on four or six implants ad modum Brånemark in full edentulism

Clin Oral Implants Res. 1995 Dec;6(4):227-31. doi: 10.1034/j.1600-0501.1995.060405.x.


A series of 156 consecutive fully edentulous patients were rehabilitated by means of fixed prostheses on either 4 or 6 screw-shaped titanium implants. This retrospective study calculated survival rates for both prostheses and individual implants. Only patients with a 10-year follow-up were considered. The implant lengths were 10 (90%) or 7 mm. They were all inserted after pretapping. In the mandible 13 and 59 prostheses were installed on respectively 4 and 6 implants. In the upper jaw the respective numbers were 14 and 70. Both groups (4 versus 6 implants) were age- and gender-matched. A reduced jaw bone volume was the major reason for limiting the number of implants to 4. Although a tendency existed for an increased failure rate in patients with only 4 implants, the survival rate for both individual implants and prostheses was the same in both groups at the end of the 10-year observation period. The present tendency of some clinicians to install as many implants as possible in full edentulism should be seriously questioned.

Publication types

  • Comparative Study

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Dental Abutments
  • Dental Implants
  • Dental Prosthesis Design
  • Dental Prosthesis Retention / statistics & numerical data*
  • Dental Prosthesis, Implant-Supported*
  • Female
  • Humans
  • Life Tables
  • Male
  • Matched-Pair Analysis
  • Middle Aged
  • Mouth, Edentulous / rehabilitation*
  • Mouth, Edentulous / surgery
  • Outcome and Process Assessment, Health Care
  • Prosthesis Failure
  • Retrospective Studies


  • Dental Implants