Effects of polishing procedures on color stability of composite resins

Abstract

The purpose of this study was to investigate the effect of different polishing methods on color stability of posterior, universal and nanohybrid composite resin restorative materials upon exposure to a staining agent. Twenty-five specimens were prepared for each of 5 different composite resins (Filtek Z250, Filtek P60, Quadrant LC, Grandio and Filtek Supreme). Specimens were divided into 5 groups and different polishing procedures, including polishing discs (Pd), polishing discs then diamond polishing paste (PdP), polishing discs then a liquid polishing system (Biscover) (PdB), and combinations of these (PdPB) were used. Unpolished specimens served as the control (C). The specimens were stored for 48 h in a coffee solution. The color of all specimens was measured before and after exposure with a colorimeter, and total color change ∆E*) were calculated. The data were analyzed with a two-way ANOVA and the means were compared by Tukey HSD test (α=0.05). The lowest color difference was observed in the groups PdP and C, while the highest color difference was observed in PdPB, and PdB. When comparing the five different restorative materials, no significant difference was observed between FiltekP60 and FiltekZ250, and these materials demonstrated significantly less color change than Quadrant LC and the nanohybrid materials (Grandio, Filtek Supreme). The posterior (Filtek P60) and universal (Filtek Z250) composite resin restorative materials, which do not contain tetraethyleneglycol dimethacrylate (TEGDMA), were found to be less stainable than the nanohybrid (Grandio, Filtek Supreme) and universal (Quadrant LC) composite resins, which contain TEGDMA. The use of diamond polishing paste after polishing with polishing discs significantly decreased staining when compared to the groups that used polishing discs alone, for all restorative materials tested. The highest color change values were obtained for the specimens that were polished with the Biscover liquid polish system (PdB and PdPB groups).

The effectiveness of four methods for stain removal from direct resin- based composite restorative materials

“…In this study, Z250 and Renamel specimens showed the least susceptibility to discoloration when immersed in the staining solution, and Filtek Supreme was the most prone to discoloration, this result was in agreement with other studies (Ergucu et al, 2008;Guler et al, 2009). The staining susceptibility of a material may be attributed to its resin matrix and filler type (Monaghan et al, 1992a,b;Ergucu et al, 2008;Guler et al, 2009).…”

“…Although Filtek Supreme, which is a nanofilled composite, has high filler content (78.5% by weight) of aggregated zirconia/silica cluster fillers of 5-20 nm and nonaggregated 20 nm silica fillers, it has high susceptibility to stain. This was noticed in several other studies and it was attributed to porosity in glass filler particles (Ergucu et al, 2008;Guler et al, 2009;Villalta et al, 2006).…”

“…The staining susceptibility of a material may be attributed to its resin matrix and filler type (Monaghan et al, 1992a,b;Ergucu et al, 2008;Guler et al, 2009). If the resin composite can absorb water, then it is also able to absorb other fluids, which could result in its discoloration.…”

Interaction between staining and degradation of a composite resin in contact with colored foods

“…So far, many studies have extensively reported the harmful effects of coffee, tea, grape juice, yerba mate and cola drinks on dental composites. [8][9][10] More recently, other reseachers 4,[11][12][13] reported the color changes promoted by lemon juice, cherry juice, carrot juice, red wine, snow cone syrup and grape drink. However, there are some other important colored foods that are very common in the patient's diet, such as ketchup and mustard, and yet, the effects of these foods on the color of composites have received little attention.…”

Finishing and Polishing Procedures of Composite Restorations by Saudi Dentists: A Cross-sectional Study

“…2 Proper finishing and polishing are important procedures that improve esthetics, maximize patients' oral health and increase the longevity of restoration. 2,3 Staining or discoloration is one of the most common reasons for replacement of composite restorations 4 and most of the published reports document that the finish, surface roughness and surface integrity of the restoration, as well as the physicochemical properties of the material itself can influence plaque adhesion and retention and staining of the composite resin. 5,6 The dental practitioners' knowledge and attitudes toward the oral health care provide the frame work for their professional work.…”