Eur J Oral Sci. 2026 Apr 29:e70097. doi: 10.1111/eos.70097. Online ahead of print.
ABSTRACT
This study evaluated the impact of in-office bleaching on color stability of bulk-fill composites submitted to staining. Bulk-fill (Aura, Opus, and Filtek One) and nanofilled (Filtek Z350) composite specimens were submitted to the following: control (CT); bleaching and immersion in distilled water (BL); and bleaching with daily 15-min immersion in coffee (BL + CF), cola-based drink (BL + CO), or red wine (BL + RW) among sessions. A spectrophotometer determined ΔE00, ΔWID, and coordinates. Degree of conversion (DC) and topography of the composites were assessed using Fourier-transform infrared spectroscopy in attenuated total reflectance (FTIR-ATR) and scanning electron microscopy (SEM), respectively. Quantitative data were submitted to statistical tests according to the factors (α = 5%). In BL, Opus and Aura displayed significantly higher ΔE00 and ΔWID than One. Compared to BL, only BL + CF significantly decreased the ΔWID and ΔL for Aura, but all staining immersions decreased ΔWID and ΔL for Opus. One and Z350 were not impacted by treatments, except for BL + CF, which significantly decreased ΔWID and ΔL. SEM revealed influence of cycling on composites’ surface, but DC did not determine their staining resistance. In-office bleaching compromised bulk-fill composite color stability, with Aura and Opus showing unacceptable changes, whereas Filtek One and Z350XT remained acceptable. Staining challenges altered Opus stability, and coffee immersion affected colorimetric outcomes across all composites after bleaching.
PMID:42052780 | DOI:10.1111/eos.70097
