Early failures in 4,641 consecutively placed Brånemark dental implants: a study from stage 1 surgery to the connection of completed prostheses.

TLDR

The study population consisted mainly of females (534/943) and mandible placements (564/943), with a mean age of 57.5 years. The authors retrospectively followed 4,641 Brånemark implants placed over 1986–1988 in 943 jaws of 889 patients from stage 1 surgery through prosthetic completion. Only 69 implants (1.5 %) failed, predominantly in edentulous maxillae with poor bone quality, among the shortest 7‑mm fixtures, and most failures occurred at the abutment connection during stage 2.

Abstract

This study comprised 4,641 Brånemark dental implants, which were retrospectively followed from stage 1 surgery to completion of the prosthetic restorations. The implants were placed during a 3-year period (1986 to 1988) in 943 jaws, representing 889 patients with complete and partial edentulism. The jaw and sex distribution revealed a predominance of mandibles (564/943) and females (534/943). The mean age of the patients was 57.5 years (range 13 to 88 years) at implant placement. Only 69 (1.5%) fixtures failed to integrate, and most losses were seen in completely edentulous maxillae (46/69), in which the jaw bone exhibited soft quality and severe resorption. A preponderance of failures could also be seen among the shortest fixtures (7 mm). A majority of the mobile implants were recorded at the abutment connection (stage 2) operation (48/69).