An open, randomised, multi-centre study, comparing straight and tapered apex implants design, in partially and totally edentulous maxillae.

Unlabelled: The design of the commercially available implant OsseoSpeed (control) was changed to a tapered apex with a smaller apical diameter; OsseoSpeed TX (test).

Objective: The present study evaluated the clinical outcome of marginal bone level as primary outcome, and cumulative implant survival rate, primary stability and condition of the peri-implant mucosa as secondary outcomes, one year after loading.

Material And Methods: 92 subjects (150 implants, ten centres), with partially or totally edentate maxillae were randomized to receive either test or control implants.