Fatigue behavior in water of Y-TZP zirconia ceramics after abrasion with 30μm silica-coated alumina particles
| Autor: | François de Mestral, Susanne S. Scherrer, H. W. Anselm Wiskott, Maria Angeles Cattani-Lorente, Jason A. Griggs, Eric Vittecoq |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Dental Stress Analysis
Ceramics Cyclic stress Materials science Chemical Phenomena Surface Properties Abrasion (mechanical) Fatigue testing Article X-Ray Diffraction Elastic Modulus Materials Testing Ultimate tensile strength Aluminum Oxide Humans Yttrium General Materials Science Cubic zirconia Ceramic Particle Size Composite material Pliability General Dentistry Silicates Metallurgy Water Silicon Dioxide Dental Porcelain Fatigue limit ddc:617.6 Mechanics of Materials visual_art Dental Etching Microscopy Electron Scanning visual_art.visual_art_medium Dental Zirconia Stress Mechanical Zirconium Particle size |
| Zdroj: | Dental Materials, Vol. 27, No 2 (2011) pp. e28-e42 |
| ISSN: | 0109-5641 |
| DOI: | 10.1016/j.dental.2010.10.003 |
| Popis: | Objective The use of a 30 μm alumina–silica coated particle sand (CoJet™ Sand, 3M Espe), has shown to enhance the adhesion of resin cements to Y-TZP. The question is whether or not sandblasting 30 μm particles does negatively affect the fatigue limit (S–N curves) and the cumulative survival of Y-TZP ceramics. Method Four zirconia materials tested were: Zeno (ZW) (Wieland), Everest ZS (KV) (KaVo), Lava white (LV) and Lava colored (LVB) (3M Espe). Fatigue testing (S–N) was performed on 66 bar of 3 mm × 5 mm × 40 mm with beveled edges for each zirconia material provided by the manufacturers. One half of the specimens were CoJet sandblasted in the middle of the tensile side on a surface of 5 mm × 6 mm. Cyclic fatigue (N = 30/group) (sinusoidal loading/unloading at 10 Hz between 10% and 100% load) was performed in 3-point-bending in a water tank. Stress levels were lowered from the initial static value (average of N = 3) until surviving 1 million cycles. Fatigue limits were determined from trend lines. Kaplan–Meier survival analysis was performed to determine the failure stress at the median percentile survival level for 1 million of cycles before and after sandblasting. The statistical analyses used the log-rank test. Characterization of the critical flaw was performed by SEM for the majority of the failed specimens. Results The fatigue limits “as received” (ctr) were: LV = 720 MPa, LVB = 600 MPa, KV = 560 MPa, ZW = 470 MPa. The fatigue limits “after CoJet sandblasting” were: LV = 840 MPa, LVB = 788 MPa, KV = 645 MPa, ZW = 540 MPa. The increase in fatigue limit after sandblasting was 15% for Zeno (ZW) and Everest (KV), 17% for Lava (LV) and 31% for Lava colored (LVB). The KM median survival stresses in MPa were: ZW(ctr) = 549 (543–555), ZW(s) = 587 (545–629), KV(ctr) = 593 (579–607), KV(s) = 676 (655–697), LVB(ctr) = 635 (578–692), LVB(s) = 809 (787–831), LV(ctr) = 743 (729–757), LV(s) = 908 (840–976). Log-rank tests were significantly different (p |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect