Fracture toughness of yttria-stabilized zirconia sintered in conventional and microwave ovens.

Statement Of Problem: The fabrication of zirconium dioxide (ZrO2) dental prosthetic substructures requires an extended sintering process (8 to 10 hours) in a conventional oven. Microwave sintering is a shorter process (2 hours) than conventional sintering.

Purpose: The purpose of this study was to compare the fracture toughness of 3 mol % Y2O3-stabilized ZrO2 sintered in a conventional or microwave oven.

Human perception of dental porcelain translucency correlated to spectrophotometric measurements.

Purpose: This study evaluated the relationship between instrumental measurements and subjective visual assessment of differences in dental porcelain translucency.

Materials And Methods: Unshaded feldspathic porcelain was used with controlled amounts of tin oxide to create two groups of 12-mm diameter disks with incremental changes in opacity. Contrast ratio (CR = Yb/Yw) was determined with a spectrophotometer, and used as a measure of porcelain translucency (Group A = 0.

Flexural and fatigue strengths of denture base resin.

Statement Of Problem: Mechanical properties of denture acrylic resins are important for the clinical success of multiple types of prostheses. Acrylic resins must be strong and resilient so as to withstand impact. Few studies utilize cyclic loads to characterize material response to repeated stress.

An in vitro comparison of vertical marginal gaps of CAD/CAM titanium and conventional cast restorations.

Purpose: To determine if there was a significant difference between the vertical marginal openings of cast restorations, computer-aided design, and computer-aided machining restorations.

Materials And Methods: Ten working dies were created from a single master die and used to fabricate ten restorations in each of the following groups: computer-aided design/computer-assisted machining (CAD/CAM), WAX/CAM, and WAX/CAST. The CAD/CAM titanium restorations were fabricated using the scanning and crown design modules of the KaVo Everest system.

Color stability of provisional crown and fixed partial denture resins.

Statement Of Problem: Provisional resins are used extensively during fixed prosthodontic treatment and exhibit varying degrees of color change/discoloration over time. Data are needed to help predict color stability of provisional resins.

Purpose: The purpose of this in vitro study was to measure the color change of 12 provisional prosthodontic materials after immersion in artificial saliva and artificial saliva-coffee solutions for 1, 2, and 4 weeks.

Effect of storage solution on surface roughness of provisional crown and fixed partial denture materials.

Purpose: This study evaluated the surface roughness of polished provisional materials at baseline and after storage in artificial saliva and artificial saliva-coffee solutions.

Materials And Methods: Ten specimens (25 mm x 25 mm x 2 mm) of 12 commercially available provisional crown materials (5 methacrylate and 7 bis-acryl resins) were fabricated and polished. Baseline surface roughness measurements (Ra) were made using a surface roughness tester.

The impact of saliva on patient care: A literature review.

Decreased salivary flow results in a clinically significant oral imbalance that may manifest as increased caries, susceptibility to oral candidosis, altered taste sensation, or a host of other problems. This article reviews the role of saliva in oral health, highlights the causes and consequences of xerostomia, and outlines treatment modalities for patients with xerostomia. Journal articles were investigated through Medline, and relevant textbooks and handbooks were consulted.

Relative translucency of six all-ceramic systems. Part II: core and veneer materials.

Unlabelled: STATEMENT OF PROBLEM All-ceramic core materials with various strengthening compositions have a range of translucencies. It is unknown whether translucency differs when all-ceramic materials are fabricated similarly to the clinical restoration with a veneered core material.

Purpose: This study compared the translucency of 6 all-ceramic materials veneered and glazed at clinically appropriate thicknesses.

Relative translucency of six all-ceramic systems. Part I: core materials.

Statement Of Problem: All-ceramic restorations have been advocated for superior esthetics. Various materials have been used to improve ceramic core strength, but it is unclear whether they affect the opacity of all-ceramic systems.

Purpose: This study compared the translucency of 6 all-ceramic system core materials at clinically appropriate thicknesses.

Flexural strength of provisional crown and fixed partial denture resins.

Statement Of Problem: Provisional prostheses are subject to flexure under function. Selection of the appropriate material for their fabrication is difficult given the limited evidence-based information on the flexural strength of provisional resins.

Purpose: This study compared the flexural strength of 5 methacrylate-based resins and 8 bis-acryl resins used to fabricate provisional crowns and fixed partial dentures.