“…The possibility remains open that composite samples with more than 5% nano-TiO 2 are antibacterial effective if adequate nanoparticle dispersion is ensured. This range of identified nano-TiO 2 amount is consistent with reports in the literature [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 51 , 52 , 53 , 54 , 55 , 56 ].…”