Mohammed M. Korany, Enas Fathelbeb Abd-el-Halim And Mohamed M. Abd-el-Moaty,

ABSTRACT
Statement Of Problem: Color Change Is One Of The Major Drawbacks Of Tooth-colored Resin-based Restorations. Aim Of The Study: This Study Was Carried Out To Evaluate, In Vitro, The Stainability Of Nano Bulk Fill Composite Resin And Nano Composite Resin After Immersion In Different Beverages. As Well As To Determine The Effect Of Hydrogen Peroxide Bleaching On Color Stability Of Both Tested Composite Resins.

Materials and Methods: Two Composite Resin Restorative Materials Were Used; FiltekTM Bulk Fill (3M ESPE, St. Paul, USA) And FiltekTM Z350 XT (3M ESPE, St. Paul, USA), In Office Bleaching Agent (WHITEsmile Power Whiting YF 40%) A Hydrogen Peroxide Based Bleaching Agent And Staining Solutions (tea And Coca-Cola). All Samples Were Stored In The Different Staining Media For 24 H/day During One Week. Staining Solutions Were Refreshed Daily.

Results: No Statistically Significant Differences Were Found Among Filtek Z350 XT And Filtek Bulk Fill Composite Resins For All Storage Media Except Tea Samples Which Showed A Statistically Significant Increase In Mean Values Of Color Change (P � 0.05). Conclusion: Bulk-fill Composite Resin (FiltekTM Bulk Fill) Had Greater Color Stainability After Immersion In All Media Especially Tea Than Conventional Composites (FiltekTM Z350 XT).