highly significantP < 0.0001
The 1st study null hypothesis was comparatively rejected concerning the material factor as the obtained results showed a highly significant difference in marginal adaptation (evaluated from the marginal gap distance mean values) [F (1,36) = 35.80, P < 0.0001] and the fracture resistance mean values [F (1,36) = 641.2, P < 0.0001] between G1 “Nanoksa G-PLUS” and G2 “VITA ENAMIC” endocrown restorative materials; (Tables 2 and 3 ; Figs. 8 and 9 ).