A total of 509 consecutive Branemark TM implants (Nobelpharma AB, Gothenburg, Sweden) were inserted in 146 patients between December 1982 and May 1989, on which 217 fixed partial dentures were planned. The cumulative failure rates after abutment connection were 3.9% and 4.1% for the maxillae and mandible, respectively. The lack of prosthesis stability was limited to 4.1% for the maxillae and 5.4% for the mandible. The average annual marginal bone loss was 0.77 mm (SD= 1.0) and 0.96 mm (SD=0.9) for the mandible, respectively, during the first year and average 0.1 mm for the following years. The mode of connection between teeth and implants or the use of porcelain instead of composite resin as oclusal material did not influence the marginal bone heigth around the implants. Technical complications were most often related to the materials used. The results of a medium-term follow-up encourage the use of the Branemark osseointegration system in the treatment of partial edentulism.