We synthesised Cu-MBGN according to a protocol described elsewhere [22 (link)]. The fillers used in this study are presented in Table 2. We admixed fillers to form a photoreactive resin mixture composed of bisphenol-A-glycidyldimethacrylate (BisGMA; Merck, Darmstadt, Germany) and triethylene glycol dimethacrylate (TEGDMA, Merck) at a 60/40 ratio, with 0.2 wt.% of camphorquinone (Merck) and 0.8 wt.% of ethyl-4-(dimethylamino) benzoate (Merck). The compositions of the composites are presented in Table 3. The total filler load was kept constant at 65 wt.%.
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