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. 2022 Apr 30;35(1):67-73.
doi: 10.54589/aol.35/1/67.

Accelerated artificial aging and color stability in resin-based cements

Maria A Lei  1 , Mariana Rivelli  2 , Alejandro M Iglesias  2 , José G Marquez  2 , Natalia Gonzalez  2 , Mariana Picca  2
Affiliations

Accelerated artificial aging and color stability in resin-based cements

Maria A Lei et al. Acta Odontol Latinoam. .

Abstract
in English, Spanish

The aim of this study was to determine color change after accelerated artificial ageing (AAA) of different composite cements that are used with veneers. Five cylindrical test specimens, 15 mm in diameter and 2 mm thick, were made from a single layer of each of the following: RelyX Veneer 3M ESPE (RX), Paracore White Coltene (PC), Solocem White Opaque Coltene (SO), Resin Duo Cement Densell (DC), Panavia V5 Paste Kuraray Noritake (PA) and Panavia F2.0 Kuraray Noritake (PF) (30 specimens altogether). The specimens were light cured following manufacturers' instructions using a Coltolux LED (Coltene) unit. Initial color was determined using an Easyshade - Vita Zahnfabrik Spectrophotometer. Then, the specimens were subjected to AAA for two weeks (336 hours) with cycles of 4 hours of UV light at 60 °C and 4 hours of vapor condensation at 50 °C, successively, after which color was recorded again. Color change was determined for each specimen according to the differenceinshadeon the Vita scale before and after AAA. Results were analyzed using Kruskal Wallis test. Mean and standard deviation for each group were: RX 8.40 (1.52); PC 8.60 (3.13); SO 6.40 (3.51); DC 10.00 (0.00); PA 7.60 (3.29); PF 2.00 (0.00). The Kruskal Wallis test showed significant difference for material (p<0.05), and comparison of means showed difference between Panavia F2.0 and the other materials. A table providing equivalence between the Vita Classic and CIELAB scales was used to transfer the recorded colors to the CIELAB scale, and the color difference ΔE was calculated for each group, where ΔL, Δa and Δb are the differences in the L, a and b values before and after the AAA. The mean and standard deviation were analyzed statistically by the ANOVA test and Tukey's test. Mean and standard deviation for each group were: RX 14.94 (2.02); PC 14.51 (4.02); SO 12.08 (4.53); DC 16.31 (0.00); PA 10.9 (3.38); PF 7.24 (0.00). The ANOVA test showed significantdifferenceformaterial (p<0.05). Tukey's test showed two groups (PF-DC, RX, PA). Under the experimental conditions of this study, it can be concluded that accelerated ageing significantly affects the color stability of the resin based cements tested.

El objetivo de este trabajo fue determinar el cambio de coloración de distintos medios de fijación a base de resinas con indicación para carillas estéticas luego de someterse al envejecimiento artificial acelerado (AAA). Se confeccionaron 30 probetas cilíndricas de 15 mm de diámetro y 2 mm de espesor con RelyX Veneer 3M ESPE (RX), Paracore White Coltene (PC), Solocem White Opaque Coltene (SO), Resin Duo Cement Densell (DC), Panavia V5 Paste Kuraray Noritake (PA) y Panavia F2.0 Kuraray Noritake (PF) de una sola capa de material. Se polimerizaron según las indicaciones del fabricante con unidad de curado Coltolux LED (Coltene). Cada grupo quedó conformado con 5 probetas de cada material. Se tomó el color con el espectrofotómetro Easyshade de Vita Zahnfabrik. A continuación, se sometieron a AAA por dos semanas (336 horas) con ciclos de 4 horas de radiaciones ultravioletas a 60°C Y 4 horas de condensación de vapor de agua a 50°C sucesivamente. Unavezterminado esteproceso se volvió a registrar el color. El cambio de color se evaluó dentro de la escala de color, ordenada en función del valor. El dato registrado fue la diferencia en la posición inicial y final en esta escala. Los resultados obtenidos para cada grupo fueron analizados por medio de la prueba de Kruskal Wallis. Los valores de media y desvío estándar de cada grupo fueron: RX 8,40 (1,52); PC 8,60 (3,13); SO 6,40 (3,51); DC 10,00 (0,00); PA 7,60 (3,29); PF 2,00 (0,00). El análisis con la prueba de Kruskal Wallis mostró diferencia significativa para el factor material (p<0.05) y la comparación de medias mostró diferencia entre PF y el resto de los materiales. Por otra parte, con una tabla de equivalencia entre los colores en escala de Vita Classic y CIE Lab, se hicieron el pasaje de los valores registrados a la escala de CIE Lab y se calculó la diferencia de color ΔE de cada grupo antes y después del AAA. La media y el desvío estándarfueronanalizadosestadísticamente por el test de ANOVA y prueba de Tukey. Los valores de media y desvío estándar de cada grupo fueron: RX 14,94 (2,02); PC 14,51 (4,02); SO 12,08 (4,53); DC 16,31 (0,00); PA 10,9 (3,38); PF 7,24 (0,00). En la evaluación de los resultados con ANOVA se encontró diferencia significativa entre los materiales evaluados (p<0,05). La comparación de medias con prueba de Tukey mostró la presencia de dos grupos (PF-DC, RX, PA). En las condiciones experimentales de este trabajo puede concluirse que el envejecimiento acelerado afecta significativamente la estabilidad de color de los cementos utilizados en este trabajo.

Keywords: color; dental veneers; resin cements.

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Conflict of interest statement

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Fig. 1
Fig. 1. Measuring sample color with a spectrophotometer.
Fig. 2
Fig. 2. Vita Classic scale ordered according to shade.
Fig. 3
Fig. 3. Arithmetic mean and standard deviation of the difference on the Vita Classic scale. Differences between groups identified with the same lowercase letters are not statistically significant.
Fig. 4
Fig. 4. Arithmetic mean and standard deviation of the difference on the CIELAB ΔE scale. Differences between groups identified with the same lowercase letters are not statistically significant.
See this image and copyright information in PMC

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