Effect of surface pretreatment and artificial aging on the retention of lithium disilicate crowns cemented to zirconia implant abutments.

Statement Of Problem: Recent advancements in restorative dentistry have seen an increase in the use of ceramic restorations and zirconia implant abutments. However, how the pretreatment of a zirconia abutment and different artificial aging protocols affect the bond strength of a cemented, monolithic lithium disilicate crown is unclear.

Purpose: The purpose of this in vitro study was to evaluate the effect of surface pretreatment on the retentive strength of milled lithium disilicate crowns bonded to custom zirconia implant abutments with different resin cements after thermocycling and long-term aging.

Implant Angulation Effect on the Fracture Resistance of Monolithic Zirconia Custom Abutments: An In Vitro Study.

Purpose: To investigate the fracture resistance and performance of zirconia when employed for the fabrication of implant abutments with different angulations, simulating anterior maxillary oral rehabilitation.

Materials And Methods: Forty-five monolithic zirconia custom abutments of internal conical implant connection were CAD/CAM designed and fabricated. The specimens were divided into three groups (n = 15/group) according to implant-to-abutment angulation.

Incidence of abutment screw failure of single or splinted implant prostheses: A review and update on current clinical status.

Osseointegrated implants have been widely used for decades with high survival and success rates. However, mechanical complications continue to be reported in the literature, and their clinical management can be often very challenging for the clinician while there is no consensus on the ideal management. The aim of this manuscript was to review the risk factors of abutment screw complications, to identify the most recent incidence of screw failure in the clinical setting and report on the methodology used and the outcome of intervention.

Accuracy of marginal fit and axial wall contour for lithium disilicate crowns fabricated using three digital workflows.

Statement Of Problem: Comparative assessment of the effectiveness of computer-aided design and computer-aided manufacturing (CAD-CAM) technologies used to fabricate complete-coverage restorations is needed. A quantitative assessment requires precise documentation of the marginal adaptation and external surface contour of fabricated restorations. Limited information is currently available regarding the effects of milling mode on marginal adaptation and reproduction of the external surface contour for CAD-CAM-fabricated restorations.

Development of an assessment strategy in preclinical fixed prosthodontics course using virtual assessment software-Part 2.

The purpose of this study was to evaluate interrater agreement between faculty and virtual assessments of preparations for complete coverage restorations in preclinical fixed prosthodontics. Teeth prepared during preclinical fixed prosthodontics practical exams at the University at Buffalo School of Dental Medicine were used in this study. Teeth were prepared for fabrication of complete cast, metal ceramic, and all ceramic crowns.