How do the self-adjusting mechanism and screw design work together in Passivity Plus™?

Passivity Plus™ achieves passive fit through two coordinated mechanisms: a pivotable self-adjusting cap that compensates for minor misfits during seating, and a conical "cold-welding" screw that locks the final position to prevent loosening.

Stage 1: Self-Adjustment During Seating

Each Passivity Plus™ base features a pivotable self-adjusting cap that allows micro-adjustment during screw tightening. When screws are partially engaged (not fully torqued), the caps can pivot freely to compensate for minor misfits between the prosthesis and implant positions. Once the prosthesis is seated correctly, final torque locks the adjusted position.

Note: The adjustment range is intentionally small, operating at the micron scale, far less than depicted in educational animations.

Stage 2: Cold-Welding for Long-Term Stability

Once seated, the conical screw design creates a friction-locked "cold weld" that virtually eliminates screw loosening. This effect occurs between the screw body and the internal base walls, not at the implant-abutment interface, which is comparable to cold-welding principles used in other dental and non-dental applications.

Mechanism Summary