Light-Cured Dental Fillings Containing Quinoline and Quinoxaline Derivatives: The Influence of Sorption and Solubility on Color Change—Part III

Light-cured dental fillings play a significant role in modern dentistry due to their aesthetics, durability, and ease of application. However, research is still being carried out to improve their mechanical properties, biocompatibility, and wear resistance by modifying their composition. Therefore, the aim of this study was to evaluate the sorption properties, solubility, and color stability of newly developed dental composites containing quinoline and quinoxaline derivatives. A total of 162 samples were prepared by mixing organic and inorganic phases. For 144 of these, color changes were assessed after conditioning in solutions simulating the oral environment, and for 18, sorption and solubility analysis were performed in distilled water according to ISO 4049. The results showed that sorption and solubility increased with increasing conditioning time. Composites characterized by higher matrix hydrophilicity showed both greater sorption and solubility as well as more pronounced color changes (Δ<i>E</i> > 6). In contrast, materials with lower sorption and solubility were characterized by greater color stability (Δ<i>E</i> < 5). The results indicate a significant impact of the hydrophilic properties of the resin matrix on the aesthetic durability of dental restorations. The data obtained can provide a basis for the appropriate design of biofunctional materials with increased resistance to degradation and discoloration.