CAD/CAM Preparation Design Effects on Endodontically Treated and Restored Molars
Abstract
Objective: To evaluate the fracture resistance of adhesively-bonded, full coverage ceramic restorationsmanufactured by a CAD/CAM technique on endodontically treated molars restored with the endocrown method versus ceramic full coverage based on amalgam cores with different ferrule design. Methods: 84 recently-extracted mandibular third molars were randomly divided int o 7 groups (n=l2) with the coronal tooth structure removed perpendicular to the root long axis at the facial-lingua l height of contour with a water-cooled, slow-speed diamond saw. The pulp chamber was exposed usingdiamond burs in a high speed handpiece, pulpal remnants removed, and canals instrumented using endodontic hand instruments. Specimens were embedded in autopolymerizing denture base resin. One group was restored with a lithium disilicate endocrown with a two millimeter pulp chamber extension.The other three groups were restored with an amalgam core using a dispersed phase, high copper amalgam that were prepared for a full coverage lithium disilicate crown with preparation designs including one and two millimeters of ferrule, plus one group with an external marginal finish line approximating the intracoronal dentin amalgam interface (minimal ferrule).
Document Details
- Document Type
- Technical Report
- Publication Date
- May 24, 2016
- Accession Number
- AD1036800
Entities
People
- Aaron T. Krance
Organizations
- Uniformed Services University of the Health Sciences