Surface degradation of composite resins under staining and brushing challenges

Abstract

Background/purpose The primeval evaluation of the properties of composite resins with different compositions that impact clinical behavior is very important in guiding use in clinical settings. The aim of this study was to evaluate color stability (ΔE) and Knoop microhardness (KHN) of composite resins containing different compositions. Materials and methods Forty-five disks were made composite resins: Filtek Z350 XT/3MESPE and Beautifill II/SHOFU and divided into 3 subgroups: Control - immersed in artificial saliva; OB – brushing with Oral B 3D White; CT - brushing with Colgate Total 12. The OB and CT groups had the disks brushed daily with 120 cycles after immersion in coffee solution (10 min) for a period of 30 days. ΔE and KHN was obtained at baseline and after the treatments. Data were analyzed ANOVA and Tukey tests ( p < 0.05). Results ANOVA revealed significant differences for ΔE and KHN. ΔE: the highest mean was observed in Beautifil II composite resin group, which differed significantly from Z350 group. For the Beautifil II, the treatments were significantly different from each other. For the Z350, the control group showed significant differences in relation to OB e CT groups. KHN: the highest mean was observed in Z350 group, which differed significantly from Beautifil II group. For Z350, the control group showed significant differences in relation to OB e CT groups. For Beautifil II, the treatments did not differ significantly among themselves. Conclusion The composite resin containing fluoride in the composition showed higher color alteration (ΔE) and lower Knoop microhardness (KHN), thus demonstrating that composition is an important factor in the clinical performance of esthetic restorative materials.

Color stability of nanohybrid composite resins in drinks

“…In the present study, the three resins showed color alteration after immersion into the tested solutions, including artificial saliva (control). This might have occurred because of the period to which the samples were immersed, since the artificial saliva significantly influences the color stability of restorative materials because of its components and water sorption by the resin matrix 3 . The color alteration can be attributed to intrinsic discolorations due to physicochemical reactions and to the quality of the polymer matrix of the resin or the quality of photopolymerization 6 .…”

“…In the analysis of ∆E values, Premisa presented better stability to immersion in various solutions, and any solution promoted color alteration up to 3.3, since ∆E values up to 3.3 is considered clinically accepted 3 . Filtek Z350 XT and Beautifil II showed a higher color change when compared to Premisa.…”

“…The demand and advances in the aesthetic area have grown, primarily with an evolution of composite resins in dental practice 1,2,3 . Alteration of color is one of the many reasons for replacement of a composite resin restoration.…”

“…Some studies 3,[8][9][10][11][12] demonstrated that some drinks, such as tea, red wine, coffee, juice, and soft drinks, are responsible for staining the composite resins to various degrees. Besides these, sports drinks can also influence the stability of color of composite resins 13 .…”

<p>Color stability of Lucirin-photo-activated resin composite after immersion in different staining solutions: a spectrophotometric study</p>

“…20,22,28,29 Extrinsic staining can be managed by maintaining polished composite surface initially and later through periodic repolishing. [30][31][32][33][34] Resin-based composite materials represent the most commonly used restorative material in aesthetic restorations. These materials are composed of a polymeric matrix based on dimethacrylate monomers and inorganic fillers and are coated with methyl methacrylate-functional silanes to bond the particles to the matrix, as well as a photo-initiator system that permits photoactivation using a light source.…”