Influence of glycerin on the color stability of a compound resin: an in vitro study
Keywords:
Composite resins, glycerine, color stability, aesthetic dentistryAbstract
Introduction: Chromatic stability of compound resins determines their aesthetic success and clinical longevity. The oxygen-inhibited layer formed during photopolymerization promotes surface staining and color change. Glycerin has been proposed as a barrier for optimizing curing and preserving color.
Objective: To determine the influence of glycerin application on the color stability of a compound resin.
Material and Methods: An in vitro, cross-sectional, quantitative experimental study was conducted. The sample included: 30 discs of Filtek Z350 resin (3M) randomly assigned to two groups (n=15): Group A without glycerin and Group B with glycerin applied in the final increment. Color evaluation was performed using a Runyes 3DS intraoral scanner, under standardized conditions. Statistical analysis was conducted using SPSS v22.
Results: Samples with glycerin showed lower color change compared to those without glycerin. Comparison between groups revealed statistically significant differences (p = 0.032). Glycerin acted as an oxygen barrier, reducing the formation of the inhibited layer and promoting more complete superficial polymerization, with a direct impact on color preservation.
Conclusions: Applying glycerin during photopolymerization significantly improves the color stability of composite resins and represents a simple technique of high clinical value to optimize the aesthetics and durability of restorations. Its incorporation into restorative protocols is recommended, as well as conducting in vivo studies to confirm these findings under real clinical conditions.
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Copyright (c) 2025 María Gabriela Benítez Pérez, María Fernanda Cáceres Guerrero, Brian Fabián Uquillas Ávila, Marlon Francisco Gavilanez Duchi, Silvia Verónica Vallejo Lara, Joceline Vanessa Villacis Balladares
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