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Component failure in removable partial dentures for patients with severe hypodontia.
The International Journal of Prosthodontics
|July 1, 1989
Summary
Removable partial dentures with acrylic resin onlays have high failure rates due to poor wear resistance and fixation issues. These problems impact the longevity of prostheses used for severe hypodontia treatment.
Area of Science:
- Dentistry
- Prosthodontics
- Biomaterials
Background:
- Severe hypodontia often requires prosthetic rehabilitation.
- Removable partial dentures (RPDs) are a common treatment modality.
- Acrylic resin onlays are frequently incorporated into RPD designs.
Purpose of the Study:
- To assess the failure rates and modes of failure for RPDs with acrylic resin onlays.
- To identify specific weaknesses in the design and material of these prostheses.
Main Methods:
- Retrospective survey of 138 removable partial dentures.
- Analysis of failure occurrences and types.
- Identification of common failure points related to materials and design.
Main Results:
- Failures occurred at both early and late stages of prosthesis use.
- Low wear resistance of acrylic resin onlays was a significant issue.
- Poor fixation of resin components to metal bases, particularly in limited space, contributed to failures.
Conclusions:
- Acrylic resin onlays in RPDs exhibit limitations in wear resistance.
- The bond between resin components and metal bases is a critical failure point.
- Design considerations for limited space are crucial for improving RPD longevity in hypodontia treatment.