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The implant-supported telescopic prosthesis: a biomechanical analysis
1Research and Development Engineer, Nobel Biocare, Göteborg, Sweden.
The International Journal of Oral & Maxillofacial Implants
|March 31, 2001
Summary
This study examined load transfer in screw-retained telescopic dental prostheses. Findings show that tightening the prosthetic screw and cement buffering accommodate misfit, improving load distribution for a versatile prosthodontic option.
Area of Science:
- Biomaterials and Biomechanics
- Dental Prosthodontics
- Implant Dentistry
Background:
- Screw-retained and cemented prostheses are common in implant dentistry.
- Understanding load transfer is crucial for long-term implant success.
- Telescopic prostheses offer restorative versatility but can present fit challenges.
Purpose of the Study:
- To investigate load transfer through screw-retained telescopic prostheses in vitro.
- To evaluate the buffering capacity of cement in combined screw-retained/cemented systems.
- To assess the impact of prosthesis misfit on load distribution.
Main Methods:
- An in vitro model with three Brånemark System implants and strain gauges was used.
- Telescopic prostheses with cantilevers were fabricated over specific abutments.
- Load distribution was measured under varying conditions, including applied loads and controlled misfit using shims.
Main Results:
- Tightening the central prosthetic screw enhanced load distribution.
- Cement demonstrated a buffering capacity, accommodating misfit and reducing bending moments on implants.
- The system showed tolerance to misfit, indicating adaptability.
Conclusions:
- Screw-retained telescopic prostheses can effectively manage load distribution.
- Cement plays a significant role in mitigating misfit-induced stresses.
- This system offers a flexible and potentially robust prosthodontic solution.