2.6. Cementation
The cementation of the crowns was conducted using an A2 shade, dual-cure, self-adhesive resin cement, RelyX U200 (3M, St. Paul, MN, USA), under a constant load of 20 N. The load was applied using a surveyor assembly machine to ensure equal pressure over the crowns, which were then light-cured for 20 secs per surface after cleaning the excess cement beyond the margins.