“…In contrast, the difference becomes insignificant under three-body wear conditions (Amer et al, 2014) where the influence of surface roughness is diminished due to the presence of abrasive media. Although bruxism and other parafunction activities are considered a contraindication for all ceramic dental prostheses, zirconia is sometimes recommended for such patients (Soxman, 2015). While zirconia caused lower opposing enamel wear in vitro (Kim et al, 2012;Preis et al, 2012;Preis et al, 2011), the associated enamel wear mechanism was delamination (Wang et al, 2012).…”