Factors affecting cure at depths within light-activated resin composites

Area of Science:

• Dental Materials Science
• Polymer Chemistry
• Biomaterials Engineering

Background:

• Optimizing the cure of light-activated resin composites is essential for successful dental restorations.
• Practitioners need to understand the relative importance of various factors affecting composite cure to maximize clinical efficiency.

Purpose of the Study:

• To simultaneously evaluate the relative impact of filler type, composite shade, exposure duration, and light source intensity on the depth of cure in light-activated resin composites.
• To rank the significance of these parameters at different depths within a simulated dental restoration.

Main Methods:

• Utilized thin composite wafers to simulate intraoral curing conditions.
• Measured monomer conversion using infrared spectroscopic techniques.
• Employed Analysis of Variance (ANOVA) to determine the statistical significance of influencing factors.

Main Results:

• At the surface, filler type, exposure duration, and resin shade were the most influential factors.
• At 1 mm depth, exposure duration, filler type, and source intensity were most significant.
• At depths of 2 mm and greater, source intensity and exposure duration were the dominant factors influencing cure, with filler type and shade having minimal impact.

Conclusions:

• The relative importance of factors influencing resin composite cure varies significantly with depth.
• Source intensity and exposure duration are paramount for achieving adequate cure at greater depths within restorations.
• Filler type and shade have a more pronounced effect on surface cure but diminish in significance with increasing depth.