Cyclic fatigue in water of veneer–framework composites for all-ceramic dental bridges

Studart, André R.; Filser, Frank; Kocher, Peter; Lüthy, H; Gauckler, Ludwig J.

doi:10.1016/j.dental.2006.01.011

Cited by 110 publications

(116 citation statements)

References 29 publications

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“…This is highly important for estimating clinical failures of ceramic restorations (Chevalier, 2006;Kelly and Denry, 2008;Denry and Kelly, 2008). Cyclic fatigue in water was shown to present a high impact on the lifespan of different zirconia materials yielding to significantly lower results than when mechanical cycling was performed in dry conditions (Studart et al, 2007a;Studart et al, 2007b). …”

Section: Discussionmentioning

confidence: 99%

“…Zirconia is much stronger under monotonic loading than cyclic loading (Morena et al, 1986;Itinoche et al, 2006;Studart et al, 2007aStudart et al, , 2007b. Under monotonic loading, the ceramics simply fail due to surface cone crack growth, whereas cycling loading causes both accumulated plastic damage and phase transformation (Vult von Steyern et al, 2006;Oilo et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Özcan

Melo

Souza

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

105

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This study evaluated the effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading. Disc-shaped zirconia specimens (Ø: 15mm, thickness: 1.2mm) (N=32) were submitted to one of the air-particle abrasion protocols (n=8 per group): (a) 50 m Al2O3 particles, (b) 110 m Al2O3 particles coated with silica (Rocatec Plus), (c) 30 m Al2O3 particles coated with silica (CoJet Sand) for 20s at 2.8bar pressure. Control group received no air-abrasion. All specimens were initially cyclic loaded (×20,000, 50N, 1Hz) in water at 37°C and then subjected to biaxial flexural strength testing where the conditioned surface was under tension. Zirconia surfaces were characterized and roughness was measured with 3D surface profilometer. Phase transformation from tetragonal to monoclinic was determined by Raman spectroscopy. The relative amount of transformed monoclinic zirconia (FM) and transformed zone depth (TZD) were measured using XRD. The data (MPa) were analyzed using ANOVA, Tukey's tests and Weibull modulus (m) were calculated for each group (95% CI). The biaxial flexural strength (MPa) of CoJet treated group (1266.3±158(A)) was not significantly different than that of Rocatec Plus group (1179±216.4(A,B)) but was significantly higher than the other groups (Control: 942.3±74.6(C); 50 m Al2O3: 915.2±185.7(B,C)). Weibull modulus was higher for control (m=13.79) than those of other groups (m=4.95, m=5.64, m=9.13 for group a, b and c, respectively). Surface roughness (Ra) was the highest with 50 m Al2O3 (0.261 m) than those of other groups (0.15-0.195 m). After all air-abrasion protocols, FM increased (15.02%-19.25%) compared to control group (11.12%). TZD also showed increase after air-abrasion protocols (0.83-1.07 m) compared to control group (0.59 m). Air-abrasion protocols increased the roughness and monoclinic phase but in turn abrasion with 30 m Al2O3 particles coated with silica has increased the biaxial flexural strength of the tested zirconia. 942.3±74.6 C ; 50 µm Al 2 O 3 : 915.2±185.7 B,C ). Weibull modulus was higher for control (m=13.79) than those of other groups (m=4. 95, m=5.64, m=9.13 for group a, b and c, respectively). Surface roughness (R a ) was the highest with 50 µm Al 2 O 3 (0.261 µm) than those of other groups (0.15-0.195 µm). After all air-abrasion protocols, F M increased (15.02-19.25%) compared to control group (11.12%). TZD also showed increase after air-abrasion protocols (0.83-1.07 µm) compared to control group (0.59 µm). Air-abrasion protocols increased the roughness and monoclinic phase but in turn abrasion with 30 µm Al 2 O 3 particles coated with silica has increased the biaxial flexural strength of the tested zirconia.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Özcan

Melo

Souza

et al. 2013

Journal of the Mechanical Behavior of Biomedical Materials

105

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“…Studart et al 4 demonstrated that Y-TZP zirconia is considered the most suitable material to resist high stress on posterior all-ceramic bridges, being suitable for the manufacture of frameworks having up to five elements.…”

Section: Introductionmentioning

confidence: 99%

Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Candido

Fais

Reis

et al. 2014

Rev. odontol. UNESP

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Introduction: The Y-TZP zirconia used for prosthetic infrastructure, in some clinical situations, can be exposed to the oral environment. In these situations, a polished surface without changes is extremely important. Objective: The aim of this study was to evaluate the mean roughness (Ra) and Vickers hardness of Y-TZP zirconia (Lava™) after simulating ten years of brushing. Material and method: Thirty-six Y-TZP bar-shaped specimens (20mm X 4mm X 1.2mm) were divided into three groups: storage in distilled water (DW, n=12, control); brushing with distilled water (BDW, n=12) and brushing with distilled water and fluoride toothpaste (BFT, n=12). Brushing was performed using a brushing machine with a soft-bristled toothbrush, simulating 10 years of brushing (878.400 cycles, 100gf). The mean roughness (Ra in μm) and Vickers hardness (VHN) of all specimens were measured twice: before and after the experimental treatment, in profilometer and microhardness tester (500gf, 30 seconds), respectively. Data were analyzed using the two-way ANOVA test (α = 0.05). Result: The interaction between groups was not significant for roughness (p = 0.701) nor for hardness (p = 0.928). The final averages for Ra (μm) were equal to: DW - 0.63; BDW - 0.64; and, BFT - 0.68. The final averages for Vickers hardness (VHN) were: DW - 1301.16; BDW - 1316.60; and, BFT - 1299.58. Conclusion: It was concluded that the brushing with distilled or fluoridated toothpaste was not able to change the roughness and hardness of Y-TZP zirconia used in this study.

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“…Por outro lado, quando a porcelana está em tração, o material de infraestrutura tem pouca influência nos valores de resistência à flexão das estruturas de duas camadas (Thompson, 2004). Studart et al (2007) observaram que o crescimento subcrítico de trincas em condições semelhantes ao ambiente oral leva à fratura da cerâmica de recobrimento antes da ruptura do material de infra-estrutura.…”

Section: Sorensenunclassified

“…Além disso, o método de confecção desses corpos-de-prova também pode ser diferente (Kelly, 1999). A avaliação de estruturas em camadas (cerâmica de infra-estrutura combinada com porcelana) pode fornecer informações importantes sobre a distribuição de tensões, modo e origem de fratura, união da interface e tensões térmicas que não são obtidas quando os materiais são avaliados separadamente (Della Bona et al, 2003;Studart et al, 2007). Entretanto, é possível prever de maneira mais confiável o comportamento dos sistemas cerâmicos utilizando corpos-de-prova na forma de restaurações.…”

Section: Introductionunclassified

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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Cyclic fatigue in water of veneer–framework composites for all-ceramic dental bridges

Cited by 110 publications

References 29 publications

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Effect of air-particle abrasion protocols on the biaxial flexural strength, surface characteristics and phase transformation of zirconia after cyclic loading

Surface roughness and hardness of yttria stabilized zirconia (Y-TZP) after 10 years of simulated brushing

Comportamento mecânico de cerâmicas utilizadas na confecção de próteses parciais fixas

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