Translucency of zirconia copings made with different CAD/CAM systems

Baldissara, Paolo; Llukacej, A.; Ciocca, Leonardo; Valandro, Luiz Felipe; Scotti, Roberto

doi:10.1016/s0022-3913(10)60086-8

Cited by 224 publications

(207 citation statements)

References 24 publications

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“…Conforming to the present study, prior investigations showed that a higher flexural strength of ceramic materials resulted in a higher contrast ratio (Stawarczyk et al, 2013a;Baldissara et al 2010). In this study, the measured flexural strength values for the monolithic zirconia materials ranged between 611 -784 MPa, depending on material type and aging regime.…”

Section: Two-body Wearsupporting

confidence: 71%

Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

Stawarczyk

Frevert

Ender

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

123

113

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OBJECTIVES: To test the mechanical and optical properties of monolithic zirconia in comparison to conventional zirconia. MATERIALS AND METHODS: Specimens were prepared from: monolithic zirconia: Zenostar (ZS), DD Bio ZX2 hochtransluzent (DD), Ceramill Zolid (CZ), InCoris TZI (IC) and a conventional zirconia Ceramill ZI (CZI). Contrast ratio (N=75/n=15) was measured according to ISO 2471ISO :2008. Grain sizes (N=75/n=15) were investigated with scanning electron microscope. Fourpoint flexural strength (N=225/n=15/zirconia and aging regime) was measured initially, after aging in autoclave or chewing simulator (ISO 13356:2008). Two-body wear of polished and glazed/veneered specimens (N=108/n=12) was analyzed in a chewing simulator using human teeth as antagonists. Data were analyzed using 2-/1-way ANOVA with post-hoc Scheffé, Kruskal-Wallis-H, Mann-Whitney-U, SpearmanRho, Weibull statistics and linear mixed models (p<0.05). RESULTS: The lowest contrast ratio values were found for ZS and IC and CZ. IC showed the largest grain size followed by DD and CZI. The smallest grain size was observed for ZS followed by CZ. There was no correlation between grain size and contrast ratio. The aging regime showed no impact on flexural strength. All non-aged and autoclave-aged specimens showed lower flexural strengths than the control group CZI. Within groups aged in chewing simulator, ZS showed significantly lower flexural strength than CZI. CZI showed higher material and antagonist wear than monolithic polished and glazed groups. Glazed specimens showed higher material and antagonist loss compared to polished ones. There was no correlation between roughness and wear. CONCLUSIONS: Monolithic zirconia showed higher optical, but lower mechanical properties than conventional zirconia. (ISO 13356:2008). Two-body wear of polished and glazed/veneered specimens (N=108/n=12) was analyzed in a chewing simulator using human teeth as antagonists. Data were analyzed using 2-/1-way ANOVA with post-hoc Scheffé, Kruskal-Wallis-H, Mann-Whitney-U, Spearman-Rho, Weibull statistics, and linear mixed models (p<0.05).Results. The lowest contrast ratio values were found for ZS and IC and CZ. IC showed the largest grain size followed by DD and CZI. The smallest grain size was observed for ZS followed by CZ. There was no correlation between grain size and contrast ratio. The aging regime showed no impact on flexural strength. All non-aged and autoclave-aged specimens showed lower flexural strengths than the control group CZI. Within groups aged in chewing simulator, ZS showed significantly lower 3 flexural strength than CZI. CZI showed higher material and antagonist wear than monolithic polished and glazed groups. Glazed specimens showed higher material and antagonist loss compared to polished ones. There was no correlation between roughness and wear.Conclusions. Monolithic zirconia showed higher optical, but lower mechanical properties than conventional zirconia.

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Section: Two-body Wearsupporting

confidence: 71%

Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

Stawarczyk

Frevert

Ender

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

123

113

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“…Zirconia, with its high degree of crystalline content, has a maximum light scattering effect. Thus, they appear relatively opaque under visible light [11].…”

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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“…In our study, TP for glass-ceramic veneered and glazed specimens was 12 ±1.1 and for zirconia veneered and glazed specimens 8 ± 0.7. Significantly higher rate of translucency in lithium disilicate glass ceramic in comparison to the zirconia ceramics was also found in Baldissara et al, Kurtulmus-Yilmaz et al and many others (18)(19)(20)(21). This finding can be attributed to the crystalline content of zirconia in order to achieve a greater strength results, but at the same time the inhomogeneity of crystals causes different refractive indices and therefore poor translucency (22,23).…”

Section: Discussionmentioning

confidence: 69%

“…U našem istraživanju parametar translucencije za slojevane i glazirane staklokeramičke uzorke bio je od 12 +/-1,1, a za slojevane i glazirane cirkonij-dioksidne uzorke od 8 +/-7. Kako ističu Baldissara i suradnici te i Kurtlmus-Yilmaz i njegovi kolege, pronađen je značajno veći stupanj translucencije kod litijdisilikatne staklokeramike u usporedbi s cirkonij-dioksidnom keramikom (18,21). Ovaj nalaz može se pripisati kristalnom svojstvu cirkonij-dioksidne keramike, što pridonosi boljoj čvr-stoći materijala, ali istodobno nehomogenost kristala uzrokuje različite indekse loma i lošu translucenciju (22,23).…”

Section: Raspravaunclassified

In Vitro Evaluation and Comparison of the Translucency of Two Different All-Ceramic Systems

Jurišić¹,

Jurišić²,

Zlatarić³

2015

Acta Stomatol Croat

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Translucency of zirconia copings made with different CAD/CAM systems

Cited by 224 publications

References 24 publications

Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

Comparison of four monolithic zirconia materials with conventional ones: Contrast ratio, grain size, four-point flexural strength and two-body wear

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

In Vitro Evaluation and Comparison of the Translucency of Two Different All-Ceramic Systems

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