The biaxial flexural strength and fatigue property of Lava™ Y-TZP dental ceramic

Pittayachawan, Piyapanna; McDonald, Alison D.; Petrie, Aviva; Knowles, Jonathan C.

doi:10.1016/j.dental.2006.09.003

Cited by 146 publications

(98 citation statements)

References 28 publications

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“…11,12 Indications for the use of CL are also contradictory and scarce in the literature. While one study reported increased flexural strength of the colored infrastructure compared with the unstained Y-TZP, 10 another study did not observe any influence on these values, 10 which agrees with results from the present study. There is also a report of a reduction in Y-TZP strength values after prolonged immersion in dye solutions.…”

Section: Discussionsupporting

confidence: 83%

“…In 2002, Ardlin 9 reported that stained infrastructure showed higher flexural strength than non-colored zirconia. Hjerppe et al, 8 in 2008, found that the prolonged immersion of Y-TZP discs in the dyes led to a considerable reduction in biaxial flexural strength values, whereas Pittayachawan et al 10 found no effect of the different dyes on the flexural strength of Y-TZP.…”

Section: Introductionmentioning

confidence: 99%

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Surface agents' influence on the flexural strength of bilaminated ceramics

et al. 2013

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The objective of this study was to evaluate the influence of different surface agents on the flexural strength of a ceramic system. Eighty bar-shaped specimens of zirconia were divided into four groups according to the agent to be used: group Control -to be cleaned with alcohol; group VM9 -application of a fluid layer of porcelain; group Effect Bonder -application of a bonding agent; and group Coloring Liquid -application of coloring liquid. All specimens received the porcelain application by the layering technique and were then subjected to thermocycling. The four-point bending test was performed to calculate the strength values (σ, MPa) and the failure modes were classified. ANOVA did not detect significant differences among the groups. The Weibull modulus were 5 (Control, VM9 and Effect Bonder) and 6 (Coloring Liquid). The cracking of the porcelain ceramic toward the interface was the predominant failure mode. It was concluded that the surface agents tested had no effect on the flexural strength of the bilaminated ceramic specimens.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Surface agents' influence on the flexural strength of bilaminated ceramics

et al. 2013

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“…The final sintering temperature applied was 1500°C. The specimens were ground finished with 10 µm diamond paper on both sides by the manufacturer [Kosmac et al, 1981;Pittayachawan et al, 2007). The thickness and diameter of each specimen were verified by measuring with a digital caliper (Starrett 727, Starrett, Itu, Brazil).…”

Section: Specimens Preparationmentioning

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

100

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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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“…These findings are in contrary with other papers that reported an increase in surface hardness was associated to decrease in surface hardness. 6,41 Conventional sandblasting with particles >100 μm causes surface damage and affects the properties of the Y-TZP as reported previously 13 ; thus, recommendations for zirconia surface treatment were a combination of sandblasting with small sized particle (30 μm) and a chemical conditioner that enhance the bonding to resin. 13,17 A lowpressure air abrasion method was proposed that reduces surface damage.…”

Section: Discussionmentioning

confidence: 99%

Surface Characterization and Cell Adhesion of Different Zirconia Treatments: An in vitro Study

Nassif

Rifai

2018

The Journal of Contemporary Dental Practice

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Aim:The aim of this study was to characterize the surface of zirconia subjected to different treatments and evaluate its effect on cell adhesion and proliferation. Materials and methods:A total of 80 zirconia disks were divided into four groups (n = 20) according to the surface treatments used: group I: as-sintered (AS), no surface treatment applied; group II: abrasion treatment applied using Rocatec (ROC; 3M ESPE) system with silica-coated alumina powder of grit size 110 μm; group III: erbium, chromium:yttrium, scandium, gallium, garnet (Er, Cr:YSGG) laser (LAS; BIOLASE) was used at a frequency of 20 Hz and output power of 3 W; and group IV: specimens were subjected to the selective infiltration etching (SIE) technique. Surface characterization was evaluated for the different groups (roughness, hardness, and morphology), and cell behavior (adhesion and proliferation) was tested (α = 0.05). Results:The ROC group reported a significant increase in surface roughness (2.201 ± 0.352) and Vickers hardness (1758 ± 16.6) compared with the other surface treatments. The SIE surface-treated group reported a significantly higher number of cells (64.5 ± 2.6 and 53.5 ± 2.2 respectively) compared with the other surface-treated groups. Conclusion:The SIE is a promising surface treatment for zirconia that significantly enhances cell adhesion and osseointegration.Clinical significance: The SIE treatment of zirconia implants may help in a faster and better osseointegration.

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The biaxial flexural strength and fatigue property of Lava™ Y-TZP dental ceramic

Cited by 146 publications

References 28 publications

Surface agents' influence on the flexural strength of bilaminated ceramics

Surface agents' influence on the flexural strength of bilaminated ceramics

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

Surface Characterization and Cell Adhesion of Different Zirconia Treatments: An in vitro Study

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