Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

Tsukamoto, Riichiro; Williams, Paul A.; Clarke, Ian C.; Pezzotti, Giuseppe; Shoji, Hiroto; Akagi, Masao; Yamamoto, Kenjiro

doi:10.1002/jbm.b.30999

Cited by 15 publications

(11 citation statements)

References 43 publications

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“…With a spatial resolution of 1 m, it was possible to map the transformation rate of used zone, and to compare them with surface roughness measurement [13,14].…”

Section: Quantitative Measurement Of Monoclinic Zirconia Volumementioning

confidence: 99%

Interest of Raman spectroscopy for the study of dental material: The zirconia material example

Wulfman

Sadoun

Chapelle

2010

IRBM

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“…With a spatial resolution of 1 m, it was possible to map the transformation rate of used zone, and to compare them with surface roughness measurement [13,14].…”

Section: Quantitative Measurement Of Monoclinic Zirconia Volumementioning

confidence: 99%

Interest of Raman spectroscopy for the study of dental material: The zirconia material example

Wulfman

Sadoun

Chapelle

2010

IRBM

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“…Currently, Yttria-stabilized tetragonal zirconia polycrystal (hereon: zirconia) is the most studied ceramic, mainly due to its high modulus of elasticity (White et al, 2005), wear resistance (Tsukamoto et al, 2008), strength and most importantly, its toughness (Guazzato et al, 2004a). These properties enabled zirconia to be milled through CAD/CAM procedures.…”

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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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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“…The specific knee used in the previous study (Figure 1) used a bi‐surface design with a spherical cam that engages at 80° of flexion, however, because the flexion was 20° this cam had no influence on the wear 11, 46. Although the PE wear rates were less than those for a total hip under similar conditions, this is common due to the differences in kinematics and wear mechanisms between total hips and total knees 9, 10, 12, 22, 31.…”

Section: Discussionmentioning

confidence: 99%

“…A recent knee study showed that both increased crosslinking (35–70 kGy) and use of zirconia femoral condyles (Figure 1) reduced wear more than 60% 11. It was also noted that the Y‐TZP zirconia condyles did not exhibit phase transformation or other surface changes over five million cycle duration test 46. However, very little is known about how PE debris production will be affected by use of crosslinked PE and ceramic material combinations in knee joints.…”

Section: Introductionmentioning

confidence: 99%

Viscosity effects in the photopolymerization of two‐monomer systems

Marcinkowska

Andrzejewska

2009

J of Applied Polymer Sci

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Photopolymerization kinetics and viscosity behavior of five different two-monomer systems forming hydrogen bonds and composed of mixtures of a high viscosity monomer (HVM) and a low viscosity monomer (LVM) at various molar ratios were investigated at six polymerization temperatures. The monomers used were mono-or dimethacrylates. Detailed viscosity measurements of the monomer mixtures showed significant negative deviations from the theoretical values (characterized by excess logarithm viscosities) indicating that interactions between the molecules of the same type (in individual monomers) are stronger than those between two molecules of different types (HVM and LVM). The photopolymerization kinetics were analyzed from the point of view of the appearance, viscosity and temperature behavior of the most reactive composition (MRC), the one showing the highest value of the maximum polymerization rate within a range of the HVM: LVM ratios. It was found that MRC appearance is determined mainly by the initial viscosity of the twomonomer system, whereas the functionality of the monomers (and network formation) is much less important (MRC is observed even in linear systems). The initial viscosity of all the monomer mixtures showing MRC lay in the range of 0.06-2 Pa s, which is narrow compared to the range of viscosities of the monomers (approximately 10 À3-10 3 Pa s).

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Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

Abstract: Our laboratory knee wear simulation appeared very supportive of the 9-year YZr/PE clinical results with Bi-Surface total knee replacements in Japan.

Cited by 15 publications

References 43 publications

Interest of Raman spectroscopy for the study of dental material: The zirconia material example

Interest of Raman spectroscopy for the study of dental material: The zirconia material example

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

Viscosity effects in the photopolymerization of two‐monomer systems

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