Table 1.

Compositional characteristics and lot numbers of the composite resin materials used in the study

Material	Main compositional characteristics
Estelite Palfique Paste (Tokuyama Dental Corp., Tokyo, Japan). (Lot no: E7101)	Supra nano hybrid composite resin, Bis-GMA, TEGDMA, submicron spherical zirconia fillers, silica, particle size: 0.1–0.3 μm, 82 wt%, 71 vol%
Estelite Posterior (Tokuyama Dental Corp., Tokyo, Japan) (Lot No: W1732)	Microhybrid composite resin, Bis-GMA, TEGDMA, Bis-MPEPP, spherical silica–zirconia fillers, particle size: 0.1—10 µm, 84 wt%, 70 vol%
Black Tea (Lipton Yellow Label Tea, Unilever, Istanbul, Türkiye)	Tannins, theaflavins, thearubigins [4]
Rooibos Tea (Twinings Pure Rooibos Tea, Twinings & Co., Andover, Hampshire, United Kingdom)	Aspalathin, nothofagin, tannin [5]
Peppermint Tea (Twinings Pure Peppermint Tea, Twinings & Co., Andover, Hampshire, United Kingdom)	Rosmarinic acid, luteolin, apigenin derivatives [6]