Influence of thermal and mechanical cycling on the flexural strength of ceramics with titanium or gold alloy frameworks
| Autor: | Denise Kanashiro Oyafuso, Marco Antonio Bottino, Mutlu Özcan, Marcos Koiti Itinoche |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Dental Stress Analysis
Materials science Hot Temperature ceramic Alloy Metal Ceramic Alloys chemistry.chemical_element Temperature cycling engineering.material SHEAR BOND STRENGTH COMMERCIALLY PURE TITANIUM Flexural strength RESTORATIONS thermal cycling Materials Testing General Materials Science Ceramic titanium Composite material Denture Design Pliability General Dentistry Universal testing machine Analysis of Variance Dental Casting Technique LOW-FUSING PORCELAIN DENTAL CERAMICS Titanium alloy Water gold Fatigue limit INTERFACE chemistry Mechanics of Materials flexural strength FATIGUE-STRENGTH visual_art mechanical cycling METAL visual_art.visual_art_medium engineering Denture Partial Fixed Gold Alloys CAST Titanium |
| Zdroj: | DENTAL MATERIALS, 24(3), 351-356. ELSEVIER SCI LTD |
| ISSN: | 0109-5641 |
| Popis: | Objectives. The aim of this study was to evaluate the effect of thermal and mechanical cycling alone or in combination, on the flexural strength of ceramic and metallic frameworks cast in gold alloy or titanium.Methods. Metallic frameworks (25 mm x 3 mm x 0.5 mm) (N = 96) cast in gold alloy or commercial pure titanium (Ti cp) were obtained using acrylic templates. They were airborne particle-abraded with 150 mu m aluminum oxide at the central area of the frameworks (8 mm x 3 mm). Bonding agent and opaque were applied on the particle-abraded surfaces and the corresponding ceramic for each metal was fired onto them. The thickness of the ceramic layer was standardized by positioning the frameworks in a metallic template (height: I mm). The specimens from each ceramic-metal combination (N = 96, n = 12 per group) were randomly assigned into four experimental fatigue conditions, namely water storage at 37 degrees C for 24 h (control group), thermal cycling (3000 cycles, between 4 and 55 degrees C, dwell time: 10 s), mechanical cycling (20,000 cycles under 10 N load, immersion in distilled water at 37 degrees C) and, thermal and mechanical cycling. A flexural strength test was performed in a universal testing machine (crosshead speed: 1.5 mm/min). Data were statistically analyzed using two-way ANOVA and Tukey's test (alpha = 0.05).Results. The mean flexural strength values for the ceramic-gold alloy combination (55 +/- 7.2MPa) were significantly higher than those of the ceramic-Ti cp combination (32 +/- 6.7 MPa) regardless of the fatigue conditions performed (p Significance. Mechanical and thermo-mechanical fatigue conditions decreased the flexural strength values for both ceramic-gold alloy and ceramic-Ti cp combinations with the results being significantly lower for the latter in all experimental conditions. (C) 2007 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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