CAD/CAM Conic Crowns for Predictable Retention in Implant-Supported Prostheses

F ixed implant-supported prostheses are currently categorized as one of two types: cement-retained or screw-retained. Each has advantages and drawbacks, and the two types consequently are recommended for different purposes. Conic crowns provide an interesting alternative with advantages over both. Prostheses can be made that can be retained without cement or screws but are reversible and predictable. Since their introduction, the efficacy and advantages of conic crowns and their good long-term prognosis in prosthodontics have been shown.1 Retention depends on physical-mechanical factors such as friction between the retaining surfaces

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