Figure 12.

The proposed induced photopolymerization mechanism of SLR/nanofillers schematic illustration of UV light penetration through the (a) SLR/high energy bandgap semiconducting NPs (e.g., TiO₂) (the dotted red circles represents there is no possible electron hole pairs generation when the UV intensity decreases), and (b) SLR/low energy bandgap semiconducting NPs (e.g., Ag-TNP) (the dotted red highlights demonstrates that, the successful electron–hole pairs formation even at lower intensity of UV lights). The energy/intensity of UV rays reduces (the red color lines indicate higher intensity and pale yellow color lines indicates lower intensity) when it undergoes deep penetration through the resin composites.