Wear resistance of CAD/CAM one-piece screw-retained hybrid-abutment-crowns made from different restorative materials.

Introduction: The aim of this study was to measure the wear progress of three high performance polymers (HPP) materials as well as that of zirconia after artificial aging (simulated 2.5- and 5-year of clinical service with thermo-mechanical loading) and compare it with the well-documented wear of lithium disilicate.

Methods: Forty implants were used to restore a maxillary first premolar, where the abutment and the crown were manufactured as hybrid-abutment-crown and connected to the implant using a titanium insert.

The influence of the restorative material on the mechanical behavior of screw-retained hybrid-abutment-crowns.

Background: The use of polymers in implant dentistry is gaining popularity, as they might have several advantages due to their shock absorption capacity.

Purpose: The aim of this study was to evaluate the performance and fracture strength of three resilient shock-absorbing polymer-based materials as well as the widely used ceramics as one-piece screw-retained implant-supported hybrid-abutment-crowns.

Materials And Methods: Forty custom-made CAD/CAM one-piece screw-retained restorations were milled out of 5 different monolithic materials (n = 8); Z: 3Y-TZP zirconia, L: lithium disilicate, P: ceramic-reinforced polyetheretherketone (PEEK), C: nano-hybrid composite resin and E: polymer-infiltrated ceramic-network.

Efficacy of Different Surface Treatments for Intraoral Repair of Veneered Zirconia Frameworks.

Purpose: To evaluate the efficacy of different surface treatments on the repair of veneered zirconia ceramics.

Materials And Methods: Forty-eight zirconia disks were divided into three groups according to the method of surface treatment: polished surface, air abraded, or ground using a special silicon carbide bur (SiC Grinding Bur). All specimens were primed using a primer containing MDP (Cimara Zircon, Voco) and then bonded to composite in Plexiglas tubes using dual-curing adhesive resin (Bifix QM, Voco).

Reducing the effect of polymerization shrinkage of temporary fixed dental prostheses by using different materials and fabrication techniques.

Objective: The aim of this laboratory study was to evaluate the horizontal and vertical effects of the polymerization shrinkage of three-unit temporary fixed dental prostheses (FDPs) on the position of the prepared teeth. In addition, the reduction of these effects by using different fabrication techniques was evaluated.

Methods: A total of 192 temporary FDPs were fabricated using one methacrylate (MA) and two dimethacrylate (DMA) materials.