Color stability of Bulk-Fill composite restorations

Area of Science:

• Dental Materials Science
• Restorative Dentistry

Background:

• Color stability is crucial for the clinical longevity of composite resins, posing a significant challenge in dental restorations.
• Investigating the color stability of bulk-fill resins is essential for understanding their long-term performance.

Purpose of the Study:

• To evaluate and compare the color stability of different bulk-fill resin composites when subjected to dye exposure.
• To determine if bulk-fill resins exhibit greater color change than conventional resins.

Main Methods:

• Eighty bovine incisors were restored with four resin types: conventional (Filtek P60), bulk-fill posterior (Filtek Bulk-Fill Posterior), SDR, and bulk-fill flowable (Filtek Bulk Fill Flow).
• Restorations were subjected to red wine immersion for 7 days at 37°C.
• Color variation (ΔE) was measured using a spectrophotometer before and after dye exposure.

Main Results:

• The conventional resin (P60) exhibited the lowest average color change (ΔE = 16.96).
• Bulk-fill flowable (FF) showed the highest average color change (ΔE = 28.09).
• Filtek Bulk-Fill Posterior (FP) and SDR groups displayed intermediate color changes (ΔE = 21.19 and 26.28, respectively).

Conclusions:

• Conventional composite resins demonstrate better color stability than the evaluated bulk-fill resins.
• Bulk-fill resins may have implications for the long-term aesthetic success and clinical longevity of dental restorations.