Effect of staining solutions and repolishing on color stability of direct composites

Abstract

ObjectivesThe purpose of this study was to assess the color change of three types of composite resins exposed to coffee and cola drink, and the effect of repolishing on the color stability of these composites after staining.Materials and MethodsFifteen specimens (15 mm diameter and 2 mm thick) were fabricated from microhybrid (Esthet-X; Dentsply and Filtek Z-250; 3M ESPE) and high-density hybrid (Surefil; Dentsply) composites, and were finished and polished with aluminum oxide discs (Sof-Lex; 3M ESPE). Color of the specimens was measured according to the CIE L*a*b* system in a reflection spectrophotometer (PCB 6807; BYK Gardner). After baseline color measurements, 5 specimens of each resin were immersed in different staining solutions for 15 days: G1 - distilled water (control), G2 - coffee, G3 - cola soft drink. Afterwards, new color measurement was performed and the specimens were repolished and submitted to new color reading. Color stability was determined by the difference (∆) between the coordinates L*, a*, and b* obtained from the specimens before and after immersion into the solutions and after repolishing.ResultsThere was no statistically significant difference (ANOVA, Tukey's test; p>0.05) among the ∆ values for the different types of composites after staining or repolishing. For all composite resins, coffee promoted more color change (∆>3.3) than distilled water and the cola soft drink. After repolishing, the ∆ values of the specimens immersed in coffee decreased to clinically acceptable values (∆<3.3), but remained significantly higher than those of the other groups.ConclusionsNo significant difference was found among composite resins or between color values before and after repolishing of specimens immersed in distilled water and cola. Immersing specimens in coffee caused greater color change in all types of composite resins tested in this study and repolishing contributed to decrease staining to clinically acceptable ∆ values.

Quantification of color variation of restorative materials used on pediatric dentistry after pigmentation

“…The teeth are seen as an importante feature in the beauty of the face, performing a crucial role in the interactions and the individual´s relationship with society 1 . For the restorative material to be clinically acceptable it is important that this presents a most similar color as possible to the tooth color after the application, in order to give an aesthetic aspect, and it is also essencial that it remains over time 13 .…”

“…Several authors state that ΔE values between 1 and 3 are visible to the naked eye and above 3.3 are clinically unacceptable 13 .…”

“…In addition to soft drinks also chocolate milk is often present in eating habits of this age group, hence the choice of Coca-Cola ® , peach Ice Tea ® and chocolate milk to join this study. Despite the existence of several studies testing the effect of Coca-Cola ® in chromatic stability of various restorative materials 13,18,20 , the number of investigations using chocolate milk as pigmentante agent is quite limited 18 .…”

“…Several studies by different researchers, still give us account of pigmentation differences between the same materials but of different brands 13,18,20 . In a future study it would be advantageous to add several brands of the same material in order to analyze this difference.…”

Estabilidade de cor das resinas compostas: um desafio para a dentística restauradora

“…Alterações na cor podem ser causadas pela descoloração intrínseca, que ocorre devido a reações físico-químicas nas partes profundas da restauração 9 . Tal condição pode estar relacionada com alterações na matriz da resina, incorporação de cargas, tamanho e distribuição de partículas, e tipo de polimerização do material 10 .…”