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Implant-supported single-tooth restorations: a 5-year prospective study
Jan L Wennström1, Annika Ekestubbe, Kerstin Gröndahl
1Department of Periodontology, Faculty of Odontology, The Sahlgrenska Academy at Göteborg University, SE 405 30 Gothenburg, Sweden. wennstrom@odontologi.gu.se
Journal of Clinical Periodontology
|May 11, 2005
Summary
This study found that Astra Tech implant-supported single-tooth replacements show minimal bone loss over five years. Long-term outcomes for dental implants are favorable, with low failure rates and stable peri-implant bone levels.
Area of Science:
- Dental Implantology
- Prosthodontics
- Periodontology
Background:
- Limited long-term follow-up data exists for implant-supported single-tooth replacements.
- Assessing the longevity of these restorations is crucial for clinical decision-making.
Purpose of the Study:
- To prospectively evaluate the 5-year clinical and radiographic outcomes of implant-supported single-tooth restorations.
- To analyze peri-implant bone level changes over a 5-year period.
Main Methods:
- A prospective clinical trial involving 40 subjects receiving 45 Astra Tech ST-implants for single-tooth replacement.
- Clinical and radiographic examinations were conducted annually for 5 years post-prosthetic treatment.
- Statistical analysis included ANOVA and binary logistic regression to assess bone level alterations.
Main Results:
- The overall implant failure rate at 5 years was low (2.6% subject level, 2.3% implant level).
- Mean marginal bone loss during the first year was minimal (0.06 mm subject level), with subsequent annual changes averaging -0.02 mm.
- Approximately 50% of implants showed no bone loss, and 13% had >1 mm bone loss over 5 years.
Conclusions:
- Astra Tech implant systems demonstrate favorable 5-year outcomes for single-tooth replacements.
- Minimal and predictable bone loss occurs during the first year and annually thereafter.
- These findings support the long-term efficacy of this implant system for single-tooth restorations.