Ultraviolet light stability of composite resins

Area of Science:

• Materials Science
• Dental Materials

Background:

• Composite resins are widely used in dentistry.
• Assessing the color stability of composite resins under UV light is crucial for clinical longevity.

Purpose of the Study:

• To evaluate the ultraviolet light color stability of seven commercial composite resins.
• To determine color changes after 1, 8, and 15 days of UV exposure.

Main Methods:

• Seven commercial composite resins were exposed to ultraviolet light.
• Color differences (Munsell Hue, Chroma, Value) were measured against unexposed controls.
• Scanning electron microscopy (SEM) was used to assess surface changes.

Main Results:

• UV exposure caused significant changes in Munsell Hue and Chroma, and smaller changes in Value.
• SEM revealed surface roughening, resin breakdown, and filler exposure in UV-exposed samples.
• No significant differences in color stability were found between brands after dark storage.

Conclusions:

• UV light significantly impacts the color stability and surface integrity of composite resins.
• Time of exposure is a critical factor in UV-induced color degradation.
• Composite resin brands could not be differentiated based on dark storage stability, but UV exposure revealed differences in degradation patterns.