Decision to modify the product under study as a result of feedback regarding subjective feeling during installation procedure. For more info, see brief summary.

The primary objective of the study is to evaluate the long-term survival rate of implants and prostheses when treating totally edentulous upper jaws with Fixture MicroThread (Micro-Macro) using a one-stage surgical procedure.

Clinical study recruitment was stopped in year 2000 due to a decision to modify the product under study. This was a result of feedback regarding the subjective feeling during the installation procedure. There were no safety concerns w/r to the study products. Patients already included and treated in the study were monitored for the full duration of the study in accordance with the clinical study protocol.

Inclusion Criteria:

• 18-75 years of age
• Sufficient amount of bone to give good support for implants of at least 9 mm length.
• Willing to give signed informed consent

Exclusion Criteria:

• Any systemic disease or condition that would compromise post-operative healing and/or osseointegration
• Systemic corticosteroids or any other medication that would compromise post-operative healing and/or osseointegration
• Unable or unwilling to return for follow-up visits