Influence of Resin Cements on Color Stability of Different Ceramic Systems

Abstract

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.

Color Stability and Gloss of Esthetic Restorative Materials after Chemical Challenges

“…CIE L*a*b* measurements of each specimen were performed using a white background. The L*a*b* system allows for the numeric definition of a color as well as to demonstrate the difference between two colors using the following formula: ΔE= [(L1-L0) 2 + (a1-a0) 2 + (b1-b0) 2 ] ½, using the On Color QC Lite software (Konica Minolta, Japan) to generate spectral measurements as a function of wavelength for data processing and analysis (8).…”

Harmonização Do Sorriso Com Laminados Cerâmicos: Relato De Caso

“…O uso de cimentos de ativação exclusivamente física é essencial para manutenção da estética e estabilidade de cor dos laminados cerâmicos, uma vez que a pequena espessura desses laminados impede mascarar alterações de cor que possam ocorrer nos cimentos ativados quimicamente ou duais 1,18 . É importante considerar a espessura e a cor, tanto do agente cimentante quanto da cerâmica, assim como a cor do substrato, uma vez que todos esses fatores influenciam o resultado estético final 20,21 . Além disso, espessuras adequadas ajudam a evitar contato prematuro e mudanças na posição final da restauração o que poderia causar fadiga precoce do material 22 .…”

Color Stability of Ceramic Veneers Luted With Resin Cements and Pre-Heated Composites: 12 Months Follow-Up

“…Nonetheless, the perception of color alteration due to resin cement aging may be different according to the ceramics' translucency. Therefore, clinicians should understand the factors affecting final result of indirect restorations and carefully choose restorative materials in order to achieve optimal aesthetic results (3).…”