Effect of nanofilled self-adhesive protective coating on color changes and surface roughness of composite resin

Background: Discoloration of composite restorations may affecting aesthetic appearance. The aging-process and surface roughness influence color changes. A nanofilled self-adhesive protecting coating has been developed for tooth restoration expected to prolong the longevity restoration. To evaluate effect protective on color-changes flowable packable after aging condition. 
 Methods: total 40 discs (15x2mm) 60 boxes (20×10× 2mm) specimens from were used. half was coated by using protective-coating. reflectance chromameter used measure baseline. Afterward, subjected into process immersing in artificial saliva carbonated drink (37oC,7d). changes calculated based [CIE L*a*b*].For roughness, box-shaped measured fresh condition, conditions. Results: change ranged 0.49 2.31. Applying protective-coating associated with a significant decrease aging. three coordinates resulted differences both composite, without application.
 Conclusion: application composite-resin.