Abstract
BACKGROUND: To evaluate the physical, chemical, and mechanical properties of the Stela Automix Bulk-fill resin composite / SDI (SBF) compared to the light-cured resin composites: Filtek Bulk Fill Flow / Solventum (FBF) and Opus Bulk Fill Flow / FGM (OBF). MATERIAL AND METHODS: The properties assessed were microhardness, sorption, solubility, color stability, and degree of conversion. Ten samples measuring 15 mm (diameter) and 1 mm (thickness) of each material were fabricated (ISO 4049:2019). The samples were prepared and analyzed using standardized methods, including Vickers microhardness testing, sequential weighings on an analytical balance for sorption and solubility tests, CIELAB spectrophotometry for color stability assessment, and FTIR spectroscopy for determining the degree of conversion. RESULTS: The self-curing resin composite exhibited higher microhardness (p < 0.001) and degree of conversion (p = 0.009), as well as sorption and solubility values within acceptable limits, in accordance with ISO 4049:2019. However, the material exhibited greater staining in coffee, which may compromise its aesthetics. CONCLUSIONS: The self-curing resin composite tested demonstrates good overall performance and is a promising material for restorations requiring greater depth. Clinical significance: To minimize the inconvenience of pigmentation that this material undergoes, it is recommended to use it as a base material and cover it with another resin composite that offers superior color stability.