Evaluation of a High Fracture Toughness Composite Ceramic for Dental Applications

Aboushelib, Moustafa N.; Kleverlaan, Cornelis J.; Feilzer, Albert J.

doi:10.1111/j.1532-849x.2008.00346.x

Cited by 51 publications

(36 citation statements)

References 34 publications

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“…It showed high fracture toughness when compared with Y-TZP 30) . Ce-TZP/Al2O3 is resistant to low-temperature aging degradation 31,32) , while Y-TZP shows lowtemperature degradation.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, there were no significant differences between Y-TZP and Ce-TZP/ Al 2O3 with regard to attachment of osteoblasts-like cells in a previous study 33) . Other studies showed superior characteristics for Ce-TZP/Al2O3 when compared with Ti and Y-TZP among common materials for implant body and abutment 32,34) . Regardless of the above advantages, the Ce-TZP/Al2O3 group had samples with bone resorption in this study.…”

Section: Discussionmentioning

confidence: 99%

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Hard and soft tissue responses to three different implant materials in a dog model

et al. 2015

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The aim of this study was to assess hard and soft tissue responses using three dental implants made of different materials. Implants made of titanium (Ti), yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and ceria partially stabilized zirconia/alumina nanocomposite (Ce-TZP/Al2O3) were used in a dog model. Five male beagles were sacrificed at three months after implantation, and harvested mandible were observed and analyzed. Histological observations were similar in all groups. There were no significant differences in any histomorphometric parameters. Our results suggested the possibility of Ce-TZP/Al2O3 as a dental implant material, similar to Ti and Y-TZP.

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“…It showed high fracture toughness when compared with Y-TZP 30) . Ce-TZP/Al2O3 is resistant to low-temperature aging degradation 31,32) , while Y-TZP shows lowtemperature degradation.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Hard and soft tissue responses to three different implant materials in a dog model

et al. 2015

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“…Additionally, NanoZr contains a higher percentage of Al2O3 (alumina) that replaces part of the zirconia, as compared to the composition of 3Y-TZP materials. Initial tests with Ce-TZP/Al2O3 nanocomposite were very promising, however, other tests did not corroborate the initial data [14][15][16] . The aim of this project was to study the effect of s-LTD (simulated LTD) and thermal fatigue in artificial saliva on the chemical and structural stability of three zirconia-based dental materials.…”

Section: Introductionmentioning

confidence: 92%

Degradation of dental ZrO<Sub>2</Sub>-based materials after hydrothermal fatigue. Part I: XRD, XRF, and FESEM analyses

et al. 2012

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The aim was to investigate the effect of simulated low-temperature degradation (s-LTD) and hydrothermal fatigue on the degradation of three ZrO2-based dental materials. Lava, IPS, and NanoZr discs were randomly assigned to (1) Control-Storage in distilled water at 37°C; (2) Aging at 134°C for 5 h (s-LTD); (3) Thermocycling in saliva for 30,000 cycles (TF). XRD revealed that ZrO2 m phase was identified in all groups but TF increased the m phase only for Lava. Under the FESEM, Lava showed no alterations under s-LTD, but displayed corrosion areas up to 60 µm wide after TF. We conclude that TF accelerated the degradation of Lava through an increase in the m phase and grain pull-out from the material surface.

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“…Zirconia FDPs are feasible for molar region, due to their high flexural strength and fracture toughness [12][13][14][15]. Limited number of clinical studies reported seldom zirconia framework fractures but more often chipping of the veneering ceramic [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

The effect of zirconia sintering temperature on flexural strength, grain size, and contrast ratio

et al. 2012

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OBJECTIVE: This study investigated the effect of sintering temperatures on flexural strength, contrast ratio, and grain size of zirconia. MATERIALS AND METHODS: Zirconia specimens (Ceramill ZI, Amann Girrbach) were prepared in partially sintered state. Subsequently, the specimens were randomly divided into nine groups and sintered with different final sintering temperatures: 1,300°C, 1,350°C, 1,400°C, 1,450°C, 1,500°C, 1,550°C, 1,600°C, 1,650°C, or 1,700°C with 120 min holding time. Three-point flexural strength (N = 198; n = 22 per group) was measured according to ISO 6872: 2008. The contrast ratio (N = 90; n = 10 per group) was measured according to ISO 2471ISO : 2008. Grain sizes and microstructure of different groups were investigated (N = 9, n = 1 per group) with scanning electron microscope. Data were analyzed using one-way ANOVA with Scheffé test and Weibull statistics (p < 0.05). Pearson correlation coefficient was calculated between either flexural strength or contrast ratio and sintering temperatures. RESULTS: The highest flexural strength was observed in groups sintered between 1,400°C and 1,550°C. The highest Weibull moduli were obtained for zirconia sintered at 1,400°C and the lowest at 1,700°C. The contrast ratio and the grain size were higher with the higher sintering temperature. The microstructure of the specimens sintered above 1,650°C exhibited defects. Sintering temperatures showed a significant negative correlation with both the flexural strength (r = -0.313, p < 0.001) and the contrast ratio values (r = -0.96, p < 0.001). CONCLUSIONS: The results of this study showed that the increase in sintering temperature increased the contrast ratio, but led to a negative impact on the flexural strength. CLINICAL RELEVANCE: Considering the flexural strength values and Weibull moduli, the sintering temperature for the zirconia tested in this study should not exceed 1,550°C. 20]. In fact, the stability of the complete system consisting both the zirconia framework and the veneering ceramic is of clinical importance.In order to decrease the costs and at the same time overcome the chipping problem, it is possible today to produce zirconia FDPs without veneering ceramic.Such monolithic zirconia FDPs require higher translucency with superior mechanical properties especially when they are to be used in the anterior region. Framework translucency is therefore one of the primary factors with respect to aesthetic properties in the selection of dental materials [21,22]. The translucency of dental ceramic is highly dependent on light scattering [23]. When the majority of light passing through a ceramic is intensely scattered and diffusely reflected, the material would appear opaque. However, if only part of the light is scattered and most of it is diffusely transmitted, the material would appear translucent where Y B was the value with a black background, and Y w was the value with a white background. In all calculations, 0 was considered as totally transparent and 1 as

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Evaluation of a High Fracture Toughness Composite Ceramic for Dental Applications

Cited by 51 publications

References 34 publications

Hard and soft tissue responses to three different implant materials in a dog model

Hard and soft tissue responses to three different implant materials in a dog model

Degradation of dental ZrO<Sub>2</Sub>-based materials after hydrothermal fatigue. Part I: XRD, XRF, and FESEM analyses

The effect of zirconia sintering temperature on flexural strength, grain size, and contrast ratio

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