Influence of powder/liquid mixing ratio on porosity and translucency of dental porcelains

Zhang, Yunlong; Griggs, Jason A.; Benham, Adam W

doi:10.1016/j.prosdent.2003.10.014

Cited by 81 publications

(90 citation statements)

References 10 publications

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“…In the present study, the standardization of the thickness cement layer and the chemical polymerization time (5 min) (17) for both cements, may have influenced the optical properties, considering that this time ensured an effective chemical polymerization and therefore, no effect of the cement on the color change was noticed. The difference in optical behavior between both evaluated ceramic systems, feldspathic and lithiumdisilicate pressed glass ceramic, is related to their microstructure (5,24). The interaction of light with the ceramic material depends on the amount (fraction), size and crystal composition and glassy matrix (9).…”

Section: Discussionmentioning

confidence: 99%

Influence of Resin Cements on Color Stability of Different Ceramic Systems

et al. 2017

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The purpose of this study was to evaluate color stability of two dental ceramics cemented with two resin cements, assessing the color difference (ΔE 00 ) by the measurement of L*, a*, b*, c* and h* of transmittance. The combination of two ceramic system (feldspathic and lithium disilicate) and two resin cements -color A3 (RelyX ARC and Variolink II) resulted in 4 groups (n=5). Ten disks-shaped specimens were fabricated for each ceramic system (10x1.5 mm), etched with hydrofluoric acid (10%) and silanized prior to cementation. The color analysis was performed 24 h after cementation of the samples and after 6 months of storage in relative humidity by means of spectrophotometry. The ΔE 00 values were analyzed statistically by two-way ANOVA followed by the Tukey test (p<0.05). One-way ANOVA were calculated for the means of individual color coordinates (L*, a*, b*, c* and h*). Two-way ANOVA showed that only the ceramic factor was significant (p=0.003), but there was no difference for the cement factor (p=0.275) nor for the ceramic/cement interaction (p=0.161). The feldspathic ceramic showed the highest values of ΔE 00 . Variations in L*, a*, b*, c* and h* were more significant for feldspathic ceramic. In conclusion, storage alters similarly the optical properties of the resin cements and feldspathic porcelain was more susceptible to cement color change after aging.

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Section: Discussionmentioning

confidence: 99%

Influence of Resin Cements on Color Stability of Different Ceramic Systems

et al. 2017

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“…The thicker the specimen, the more opaque is the material and, as a consequence, lower light energy can be transmitted through it (14)(15)(16). In addition to thickness, the presence of specific elements also contributes to an increased opacity, as observed for E2 veneered with D. The addition of titanium oxide to obtain a yellowbrown shade that matches that of the natural teeth increases the light absorption (17). When comparing EST and EMP specimens, the transmittance and irradiance through EST was always significantly higher than through EMP, for all thicknesses.…”

Section: Discussionmentioning

confidence: 99%

“…When comparing EST and EMP specimens, the transmittance and irradiance through EST was always significantly higher than through EMP, for all thicknesses. The amount of the light being absorbed, reflected and transmitted depends in large part on the amount of crystals within the glassy matrix (14,15,17) and the size of the particles compared with the incident light wavelength (14,17). Although glass ceramics reinforced with leucite crystals present fewer amounts of grains -35 ± 5 vol% of leucite for EMP in comparison with 70 ± 5 vol% of lithium disilicate for E2 (3) -, the size of the leucite crystals dispersed within the EST glassy matrix allowed a high amount of light to pass through it.…”

Section: Discussionmentioning

confidence: 99%

UV-Vis spectrophotometric analysis and light irradiance through hot-pressed and hot-pressed-veneered glass ceramics

et al. 2008

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This study evaluated the irradiance of curing units through core and veneered hot-pressed ceramics as well as the transmittance of these materials. Discs of 0.7, 1.4 and 2 mm in thickness of Empress (EMP) and Empress Esthetic (EST), and 0.8 (n=5) and 1.1 mm (n=5) thickness of Empress 2 (E2) were obtained. For E2, two of the 0.8-mm-thick discs were covered with dentin (1.2-and 1.4-mm-thick) and two with dentin + enamel (1.5-mm-thick). The 1.1-mm-thick specimens were submitted to the same veneering procedures. Specimens were evaluated by UV-Vis transmittance analysis and the percentage of transmittance was recorded. Irradiance through each specimen was evaluated with a quartz-tungsten-halogen (QTH), used in continuous or intermittent exposure modes, or a blue lightemitting diode (LED). Data were analyzed by Dunnett's test, ANOVA and Tukey's test at 5% significance level. Exposure through ceramic decreased the irradiance for all ceramics. Irradiance through EST was significantly higher than through EMP. For E2, reduction in irradiance depended on the core and/or veneer thickness. The QTH intermittent mode showed higher irradiance than the continuous mode, and both showed higher irradiance than LED. The ceramic significantly influenced irradiance and transmittance, which were found to decrease with the increase in thickness.

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“…Some researchers have reported that there was a possibility that pores formed in the porcelain layer during firing 15) . Additionally, the powder-liquid mixing ratio of porcelain veneer had an effect on crown porosity 20) . The veneering porcelain of the ceramiccore CAD/CAM crown had lower mechanical strength than the core 2) , and accompanied with the pores, it meant that the crown was prone to fracture of the porcelain veneer.…”

Section: Discussionmentioning

confidence: 99%