Translucency of Dental Porcelains

Brodbelt, Robert H.W.; O’Brien, William J.; Fan, P.L.

doi:10.1177/00220345800590011101

Cited by 188 publications

(157 citation statements)

References 5 publications

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“…Furthermore, the light source might also affect the polymerization process. The primary characteristic of light, which interferes with its transmission, is the irradiance level, as ceramics might absorb up to 50% of the light energy (13). However, the light emission profile of different light-curing units (LCUs) may also interfere with the polymerization potential (11).…”

Section: Introductionmentioning

confidence: 99%

Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent

et al. 2008

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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]. When the majority of light passing through a ceramic is intensely scattered and diffusely reflected, the material would appear opaque.…”

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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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“…Enamel has a higher transmittance than dentine, which in turn differs considerably from that of cementum, since these tissues have different compositions, and mineral and organic components of different amounts and qualities. 12 Visible light spectrophotometry has also been reported as an efficient method to verify the transmittance of different materials or structures. Transmittance can be measured through direct transmission, by interposing the specimen between a light source and a detector that checks the amount of light that crosses the sample at a given wavelength.…”

Section: Discussionmentioning

confidence: 99%

“…Transmittance can be measured through direct transmission, by interposing the specimen between a light source and a detector that checks the amount of light that crosses the sample at a given wavelength. 12 This study evaluated direct transmittance using a visible light spectrophotometer to record the transmittance of specimens at wavelengths ranging from 400 to 700 nm, which corresponds to the light spectrum visible to the human eye, according to the methodology described by Brodbelt et al 12 (1980) and Masotti et al 13 (2007). Several factors such as filler and polymeric matrix, refractive index, type of monomer and filler, and filler content 13,15,16 can influence the light transmittance and opacity of composite resins.…”

Section: Discussionmentioning

confidence: 99%

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Changes on transmittance mode of different composite resins

et al. 2009

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The purpose of this study was to evaluate the transmittance of seven different composite resins. Ten specimens were prepared (10 mm diameter, 2 mm thickness) for each experimental group, as follows: G1- Charisma® A2 (Heraeus-Kulzer); G2- FiltekTM Supreme A2E (3M/ESPE); G3- FiltekTM Supreme A2B (3M/ESPE); G4-FiltekTM Supreme YT (3M/ESPE); G5- Esthet-X® A2 (Dentsply); G6- Esthet-X® YE (Dentsply); G7- Durafill® A2 (Heraeus-Kulzer) and G8- FiltekTM Z-100 A2 (3M/ESPE). The transmittance mode was measured using a UV-visible spectrophotometer (Cary Instruments) at 400-760 nm. The specimens were evaluated at three different times: zero hour (initial), 24 hours and 10 days after immersion in artificial saliva. The differences in transmittance were determined by two-way analysis of variance (ANOVA) and Tukey's test. The various composite resins showed significant differences in the wavelength dependence of transmittance. The mean values of transmittance increased significantly, with wavelengths increasing from 400 to 760 nm. The performance of the experimental groups was similar in terms of immersion time, considering that at time zero and after 10 days, all the groups showed similar results, which were statistically higher than the values obtained after 24 hours of immersion. The FiltekTM Supreme YT composite resin presented the highest mean transmittance values along the wavelengths at the three measured times. Esthet-X® YE and Durafill® yielded similar mean transmittance values, which were higher than those of the other groups. This study shows that the transmittance values of composite resins are directly related with the type, size and amount of inorganic filler particles

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Translucency of Dental Porcelains

Cited by 188 publications

References 5 publications

Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent

Effects of ceramic thickness and curing unit on light transmission through leucite-reinforced material and polymerization of dual-cured luting agent

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

Changes on transmittance mode of different composite resins

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