Figure 7.

(A) A sample from group 5 showing an adhesive failure at the zirconium dioxide surface and the luting agent: the titanium bonding base is entirely covered with the luting agent (category A); (B) A sample from group 7 shows a mixed failure pattern: the titanium bonding base is partially covered with the luting agent (category D); (C) A sample from group 1 displays a failure pattern between the titanium bonding base and the luting agent: the bonding base does not have residues of the luting agent (category B).