An In Vitro Study Of The Staining Resistance Of Ceramage And Filtek Z350 Nanocomposite Resin

Objective:This in vitro study was to evaluate the staining resistance of Ceramage ceramic optimized polymer and Filtek Z350 nanocomposite resin.Materials and Methods:Twelve standard specimens of each tested material with shade A2 were produced.The specimens were stored in distilled water and commercial coffee, red wine and green tea at 60℃.The color values of the specimens were determined by a digital colorimeter on CIE1976-L*a*b* color stem before and after immersion at 24,48,72 hours, color difference(△E) was calculated as△E= [(△L*)2+ (△a*)2+(△b*)2]1/2.Results:1.Distilled water caused imperceptible color change for both Ceramage and Filtek Z350(△E<1.0). Coffee, red wine and green tea all caused visible color changes for both resins(△E>1.0). The color differences increased with the increase of immersion time. And after 72 hours, color changes exceeded the clinical acceptable level(E>3.7).2. For Filtek Z350, coffee caused the most significant color change(p<0.05); For Ceramage, red wine caused the most significant color change(p<0.05);. 3.After immersion in coffee or tea, Filtek Z350 showed more significant color change than Ceramage(p<0.05); After immersion in red wine, Ceramage showed more significant color change than Filtek Z350(p<0.05); 4. Coffee and red wine caused L* decrease,b* increase, a* was little changed; Green tea mainly caused b* increase, L* and a* were little changed.Conclusions:Both materials showed significant color change after immersion in extrinsic staining solusions, The color differences increased with the increase of immersion time. The two materials showed different staining resistance according to the staining agents. Ceramage was more color stable than Filtek Z350 for coffee or tea, but for red wine, the forner was less color stable than the latter.