The prosthetic components in three-quarter (A), transversal (B), and longitudinal (C) perspectives. The “Seeger” ring (white) engages the distal undercuts of the inclined abutment in correspondence of its lacking portion, defining with the inner surface of the Extragrade (grey) a snap-retention joint (blue). An anti-rotation notch (orange) in the same zone guarantees the axial steadiness. The external milled surface of the turrets (green) guides their correct positioning