Ceramics in dentistry: Historical roots and current perspectives

Kelly, J. Robert; Nishimura, Ichiro; Campbell, Stephen D.

doi:10.1016/s0022-3913(96)90413-8

Cited by 546 publications

(420 citation statements)

References 72 publications

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“…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].…”

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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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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“…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). In order to improve the optical behavior of the zirconia restorations, shaded zirconia cores were developed (24)(25)(26).…”

Section: Discussionmentioning

confidence: 69%

“…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). Da bi se poboljšala optička svojstva cirkonij-dioksidnih nadomjestaka, primjenjuju se različiti postupci slojevanja jezgre (24 -26).…”

Section: Raspravaunclassified

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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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“…Advancements in the field of adhesive dentistry and ceramic technology have broadened the use of all ceramic restorations significantly. 1 These restorations that were introduced by Dr. Charles Land in 1903, have undergone significant improvement and refinement over the past few decades, and have now matured into a predictable treatment option in terms of longevity, periodontal response and patient satisfaction. 2,3 Case report A 39-year-old female patient had reported to our department with the chief complaint of poor smile due to loss of crowns and unaesthetic gaps in between the front teeth [ Fig.…”

Section: Introductionmentioning

confidence: 99%