Y-TZP–based cores present with a metal-like radiopacity that enhances radiographic evaluation of the restoration. As a result of their mechanical and physical properties, Y-TZP–based FPD frameworks require a relatively small connector area compared to other allceramic core materials, such as glass-infiltrated alumina, glass-infiltrated alumina with 35% zirconia, and lithium disilicate, ranging between 7 and 16mm2 (Table I). In addition, with Y-TZP–based materials, adhesive cementation may be used but is not mandatory, and traditional luting agents, including glass-ionomer cements, resin-modifed glass ionomer cements, and compositeresin luting agents, may be used. To date, the long-term clinical data on the success of Y-TZP–based FPDs is not available because they are relatively new