Fracture Resistance of Titanium-Based Lithium Disilicate and Zirconia Implant Restorations.

Purpose: To evaluate the fracture resistance of a newer lithium disilicate abutment material.

Materials And Methods: A premolar-shaped implant crown was designed using CAD/CAM software, and four groups of implant and crown combinations were milled: (1) lithium-disilicate hybrid-abutment crown; (2) "screwmentable" lithium-disilicate hybrid abutment/lithium-disilicate crown with screw channel; (3) lithium-disilicate hybrid abutment/lithium-disilicate crown; and (4) zirconia hybrid abutment/lithium-disilicate crown (control). The specimens were cemented to a titanium-base implant system, subjected to thermocycling and cyclic loading, and fractured in a material testing device.

Effect of imaging powders on the bond strength of resin cement.

The application and incomplete removal of a computer-aided design/computer-aided manufacture imaging powder may affect the dentin surface prior to bonding a ceramic restoration. The purpose of this study was to compare the effect of imaging powder residue on the shear bond strength of a self-adhesive resin cement to dentin. Mounted human third molars were sectioned coronally with a diamond saw to expose the dentin, which was then prepared with a diamond bur mounted in a custom jig.

Retrofitting an existing implant overdenture to a new and redesigned intraoral framework: a clinical report.

The esthetics and function of a tissue borne, implant retained overdenture are two of the most important factors that define a patient's acceptance of the prosthesis. In this clinical report, an existing implant overdenture, which was esthetically acceptable to the patient but which had no incorporated retentive components in the substructure framework, was retrofitted to a newly designed and fabricated implant framework. The added retentive components on the new framework increased the patient's overall masticatory function, reduced the frequency of dental visits, and allowed the patient to retain the original overdenture.