Silorane, ormocer, methacrylate and compomer long-term staining susceptibility using ΔE and ΔE 00 colour-difference formulas

Abstract

The aim of this study was to evaluate the staining susceptibility of a silorane (Filtek Silorane), an ormocer (Ceram X Duo), a methacrylate (Tetric EvoCeram) and a compomer (Dyract) exposed on the long term to various staining agents by using ΔE and ΔE 00 colour-difference formulas. Thirty-six disc-shaped specimens were made of each of the four chemically different materials, randomly divided in six groups (n = 6) and immersed in five staining solutions (red wine, juice, coke, tea and coffee) or stored dry (control) in an incubator at 37 °C for 99 days. Spectrophotometric measurements by means of a spectrophotometer (Spectroshade Handy Dental, MHT) were repeated over a white (L* = 92.6, a* = -1.2, b* = 2.9) and black (L* = 1.6, a* = 1.2, b* = -1.0) background made of plasticized paper, in order to determine the colour changes according to ΔE, ΔE 00 and translucency formulas. Statistical analysis was performed by means of factorial Anova, Fisher's LSD test (post hoc) and a Spearman rank correlation between ΔE and ΔE 00. When analysed over a white background, mean ΔE 00 values were highly significantly different and varied from 0.8 (Ceram X Duo/air) to 20.9 (Ceram X Duo/red wine). When analysed over a black background, mean ΔE 00 values were highly significantly different and varied from 1.0 (Ceram X Duo and Tetric/air) to 25.2 (Ceram X Duo/red wine). Differences in translucency varied from 0.3 (Ceram X Duo/air) to 21.1 (Ceram X Duo/juice). The correlation between ΔE and ΔE 00 over a white background was 0.9928, while over a black background, it was 0.9886.

Color of bulk‐fill composite resin restorative materials

“…The authors found that the ormocer‐based material had a strong discoloration potential as indicated by the Δ E (8.99) values of distilled water storage. Ardu et al and Gregor et al found that the ormocer‐based composites they used in their studies showed statistically higher discoloration than the conventional restorative materials, in latter study emphasized that the insufficient integration between the resin matrix with siloxane particles and the prepolymerized microfill particles could explain the discoloration. Even if the structure of the ormocer‐base matrix is not hydrophilic, water and colorant fluids can be diffused into the composite resin and can cause discoloration susceptibility when the inorganic and organic contents are not silanized as required and the integration in the resin matrix is not sufficient …”

“…Even if the structure of the ormocer-base matrix is not hydrophilic, water and colorant fluids can be diffused into the composite resin and can cause discoloration susceptibility when the inorganic and organic contents are not silanized as required and the integration in the resin matrix is not sufficient. 29 Many studies reported that red wine has an impact on color change for composite resins, similar to the result of this study. 11,13,14,30 Tsitrou et al 31 showed that ethanol has a solvent effect on monomers in different composites resins.…”

Translucency changes of direct esthetic restorative materials after curing, aging and treatment

“…Applying the criterion of the present review, decreases in TP were perceivable after methylene blue staining (ΔTP > 2). Staining susceptibility of silorane, ormocer, methacrylate and compomer exposed on the long term (99 days) to various staining agents (red wine, juice, coke, tea, and coffee) was determined 33. As results, changes in TP varied from 0.3 (air control) to 21.1 (juice).…”

The Effects of Fresh Detox Juices on Color Stability and Roughness of Resin‐Based Composites

“…The three‐dimensional color measurement formulas CIEL * a * b * and CIE2000 are recommended by ISO for calculating color differences. Gregor et al reached the same statistical conclusions with both of the formulas . In this study, we used the CIEL * a * b * formula.…”

“…Gregor et al reached the same statistical conclusions with both of the formulas. 35 In this study, we used the CIEL * a * b * formula. Different studies have used different threshold values, [36][37][38] and Khashayar et al investigated the thresholds of perceptibility and acceptability of color changes by evaluating color studies in the literature.…”