Objectives: The purpose of this study is to investigate early loading of Fixture Microthread^TM OsseoSpeed^TM. This is a long-term 5-year study. Early results will be reported. The OsseoSpeed^TM surface is a TiO₂-blasted rough surface that is modified through a cleaning process in diluted hydrofluoric acid. Preclinical studies suggest that further improvements in osseointegration can be achieved with this modified rough fixture surface. Methods: A total of 45 patients with tooth loss in the posterior maxilla (Kennedy class I or II) distributed at three centers were accrued. Minimums of two screw-shaped, self-tapping fixtures were placed in a transmucosal position. Resonance Frequency Analysis (RFA) was used to assess implant stability. Implant stability quotient (ISQ) values were recorded at fixture placement, and at 2, 6, and 12 weeks. Additional ISQ values are to be obtained at 26 and 52 weeks. After 6 weeks of healing, temporary restorations in prosthetic restorations will be delivered. The patients will return for follow-up visits at 24, 36, and 60 months. Results: 36.7% of the patients were male and 63.3% female. Mean age was 59.4±10.9 years. 60% were non-smokers and 40% ex-smokers. Occasional or habitual smokers were excluded from the study. A total of 81 fixtures were placed. Installed fixture positions were as follows: 1st premolar 25.9%, 2nd premolar 40.7%, 1st molar 28.4%, and 2nd molar 4.9%. The mean ISQ value at 0 weeks was 66±8, at 2 weeks 65±7, at 6 weeks 65±5, and at 12 weeks 67±5. Complications were minimal. Conclusions: Preliminary results indicate that the Fixture Microthread^TM OsseoSpeed^TM (AstraTech Implants) has the potential for early loading in the posterior maxilla. Study supported by AstraTech AB, Sweden.

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