This prospective study demonstrated that placing Brånemark implants into fresh extraction sites can be successful over a period of 5 years of loading. One of the outcomes of the study shows that there is a clinical correlation between implant failure and periodontitis as a reason for tooth extraction, even if it is difficult to give it a casual association. It can be hypothesized that periodontitis affected tissues might have a negative local influence because of the presence of infrabony defects that could possibly increase the gap between bone and implant or jeopardize achievement of primary stability.

BackgroundVariable-thread tapered implants are designed to achieve high primary stability in demanding situations, such as fresh extraction sites or regions of low bone quality. Due to their specialized thread design, these implants can be placed at insertion torques up to 70 Ncm without increased risk of implant failure. 1 AimThis retrospective analysis evaluated variable-thread tapered implants used to support single crowns or partial bridges after up to 6.7 years of function. Methods and Materials• Patients with single or partial tooth restorations, who received at least one variable-thread tapered implant (NobelActive TM ,