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CAD/CAM Conic Crowns for Predictable Retention in Implant-Supported Prostheses
The International Journal of Prosthodontics
|May 6, 2016
Summary
This study found that decreasing the cone angle of CAD/CAM conic crowns significantly increases retention strength in implant-supported prostheses. This research offers a predictable alternative to traditional retention methods.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Prosthodontics
Background:
- Implant-supported prostheses require secure and predictable retention.
- Current methods like cementation and screw retention have limitations.
- Novel retention systems are needed for improved clinical outcomes.
Purpose of the Study:
- To evaluate the retention strength of computer-aided design/computer-aided manufacturing (CAD/CAM) conic crowns.
- To determine the relationship between cone angle and retention force.
- To assess the potential for reversible and predictable retention in implant prostheses.
Main Methods:
- CAD/CAM abutments and copings with varying cone angles (1-8 degrees) were designed and manufactured.
- Retention strength was measured using a Zwick/Roell testing frame.
- Forty specimens were tested to gather retention force data.
Main Results:
- Retention strength increased significantly as the cone angle decreased.
- A curvilinear trend was observed, with lower angles yielding higher retention forces.
- Data ranged from 21.02 N (8 degrees) to 293.40 N (1 degree).
Conclusions:
- Decreasing the cone angle of CAD/CAM conic crowns enhances retention strength.
- Predictive models were developed based on the observed data.
- This offers a promising alternative to cemented and screw-retained implant prostheses.
