Fig. 2

Typical fracture specimens with three abutment designs

A: Vita Enamic-1 mm (Type II), B: Vita Enamic-2 mm (Type III), C and D: Vita Enamic-3 mm (Type IV). In the 1 mm (A) and 2 mm groups (B), some residual crown restorations remained on the abutments, while in the 3 mm group (C and D), the crowns completely detached from the abutments