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Comparison of load distribution for implant overdenture attachments
Joseph A Porter1, Vicki C Petropoulos, John B Brunski
1Department of Biomedical Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA.
The International Journal of Oral & Maxillofacial Implants
|October 17, 2002
Summary
Different implant overdenture attachments experience varying forces and moments. The Zest Anchor Advanced Generation (ZAAG) attachments showed the largest implant forces, while several others exhibited lower forces and moments.
Area of Science:
- Dental Implantology
- Biomaterials Science
- Biomechanics
Background:
- Implant-retained overdentures offer improved stability and function for edentulous patients.
- The choice of attachment system significantly influences the load distribution on supporting implants.
- Understanding these biomechanical forces is crucial for long-term implant success and patient satisfaction.
Purpose of the Study:
- To compare force and moment distributions on various implant overdenture attachments.
- To evaluate how different vertical compressive loading locations affect these forces.
- To provide data aiding in the selection of optimal attachment systems for implant overdentures.
Main Methods:
- Nine different overdenture attachment systems were tested, including Nobel Biocare, Zest Anchor, Sterngold ERA, and Compliant Keeper systems.
- Custom strain-gauged abutments and two Brånemark System implants in a test model were used.
- Static compressive loads of 100 N were applied at four distinct locations (distal midline, right implant, left implant, mid-anterior) to measure forces and bending moments on each implant.
Main Results:
- Both the location of force application and the type of attachment system significantly influenced implant forces and moments (P < .05).
- Generally, higher forces and moments were recorded when loads were applied directly over an implant or in the mid-anterior region.
- Attachment type was a significant factor, with variations in force and moment transmission observed across the tested systems.
Conclusions:
- Significant differences in force and moment transmission were observed among the various implant overdenture attachment systems based on loading location.
- The Zest Anchor Advanced Generation (ZAAG) attachments tended to result in the highest implant forces.
- Sterngold ERA white (SEW), Sterngold ERA orange (SEO), Nobel Biocare standard ball (NSB), and Compliant Keeper Systems (CK-70, CK-90) generally exhibited lower implant forces and moments.