Effect of whitening toothpastes on color stability of different restorative materials

Objective: The purpose of this study was to evaluate the effects of application of three over the counter whitening toothpastes (Colgate Optic White, Aquafresh Ultimate White and Crest 3D White) on the color stability of different esthetic restorative materials (Resin composite/Filtek Z250 XT, resin modified glass ionomer/GC Fuji II LC, and glass ionomer/Ketac Molar Quick Aplicapweek) commonly used in children. Methods: Cylindrical specimens were prepared from each restorative material using Mylar strip with no further trimming, finishing or polishing or after finishing and polishing. The specimens were randomly assigned into 4 main groups according to each restorative material. All specimens were measured for color (Baseline T1). All specimens were finished and polished using Sof-Lex finishing and polishing system according to the instructions of the manufacture. Then, all specimens according to the groups were brushed with water without whitening toothpastes (control) or brushed with the different whitening toothpastes. The specimens were rinsed before color measurement (Testing Phase Three – T2). Statistical analysis were performed using paired ttest used and Tukey’s HSD (Honestly Significant Differences) Post Hoc Test. Results: Delta E (DE) showed significant difference (P=0.0001) between baseline (T1) and after application of whitening toothpastes (T2) for all three restorative materials. DE showed significant difference (P=0.0001) between baseline (T1) and after application of whitening toothpastes (T2) for distilled water, Colgate Optic White, and Aquafresh Ultimate White. There was significant difference (P=0.001) between baseline (T1) and after application of whitening toothpastes (T2) for Crest 3D White. Conclusion: The use of Colgate Optic White, Aquafresh Ultimate White and Crest 3D White whitening toothpaste for two minutes twice each day for 15 days does cause significant change in the color of the Filtek Z250 XT, GC Fuji II LC, and Ketac Molar Quick Aplicap restorative materials. The highest color change was recorded for Ketac Molar Quick Aplicap and use of Colgate Optic White. Color change is dependent upon the type of restorative material and whitening.