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Wear simulation effects on overdenture stud attachments.
Vygandas Rutkunas1, Hiroshi Mizutani, Hidekazu Takahashi
1Division of Prosthodontics, Institute of Odontology, Faculty of Medicine, Vilnius University.
Dental Materials Journal
|November 30, 2011
Summary
Wear simulation on overdenture attachments revealed significant retentive force loss, particularly in ERA attachments. Locator attachments showed fluctuating retention, indicating complex wear mechanisms beyond simple dimensional changes.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Overdenture attachments are crucial for denture stability and retention.
- Resilient attachments offer improved comfort but their long-term durability under functional loading is a concern.
- Understanding wear effects is vital for predicting the lifespan of these components.
Purpose of the Study:
- To evaluate the effects of simulated wear on the retentive force and surface characteristics of commercially available resilient overdenture attachments.
- To compare the wear performance of different attachment systems, including ERA, Locator, and OP anchor.
- To investigate the relationship between dimensional changes, surface alterations, and retention loss.
Main Methods:
- Six types of resilient overdenture attachments were subjected to 15,000 insertion-removal cycles.
- Retentive forces were measured throughout the wear simulation.
- Dimensional changes were assessed using light microscopy.
- Surface topography was analyzed using Scanning Electron Microscopy (SEM).
Main Results:
- ERA (orange and white) attachments exhibited a sudden decrease in retentive force.
- Locator attachments (pink, white, and blue) demonstrated fluctuating retentive forces during wear simulation.
- Plastic cores of attachment males showed more significant dimensional changes and surface wear than plastic rings.
- SEM analysis revealed that some specimens developed smoother surfaces post-wear, while others showed increased roughness.
Conclusions:
- Retention loss in resilient overdenture attachments is a complex phenomenon.
- Dimensional changes and surface alterations partially explain retention loss, but other factors are likely involved.
- The wear behavior varies significantly among different attachment systems, impacting their clinical longevity.
