Color Stability of Bulk-fill Resins Immersed in Chicha: In vitro Study

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Color Stability Analysis

Background:

• Bulk-fill resin composites are widely used in dental restorations for their efficiency.
• The aesthetic longevity of dental materials can be compromised by staining agents.
• Understanding the color stability of bulk-fill resins under various conditions is crucial for clinical success.

Purpose of the Study:

• To evaluate the color stability of three different bulk-fill resin brands.
• To assess the influence of immersion in chicha morada and light-curing distance on resin color.
• To compare the performance of FGM® Opus Bulk-fill APS®, 3M ESPE® Filtek™ Bulk Fill®, and Ivoclar® Tetric N-Ceram Bulk Fill®.

Main Methods:

• An in vitro study involving 216 bulk-fill resin discs divided into nine groups.
• Resins were light-cured at distances of 0 mm, 2 mm, and 4 mm.
• Specimens were immersed in either distilled water (control) or chicha morada for up to 3 weeks, with color measurements taken at intervals.

Main Results:

• All tested bulk-fill resins showed significant color changes (Delta E) when immersed in chicha morada.
• 3M ESPE® and Ivoclar® resins exhibited significant color instability at all time points (24 hours, 1 week, 3 weeks).
• FGM® resin demonstrated better color stability, with significant changes observed only at 24 hours and 1 week, and a decrease in 'L' value with increased immersion time.

Conclusions:

• FGM® Opus Bulk-fill APS® displayed superior color stability compared to 3M ESPE® Filtek™ Bulk Fill® and Ivoclar® Tetric N-Ceram Bulk Fill® after 3 weeks in chicha morada.
• Immersion duration and light-curing distance significantly influenced the color stability of the bulk-fill resins.
• Clinicians should consider the potential for color change in bulk-fill resins when exposed to staining beverages.