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What is "cold welding" in Passivity Plus™, and how does it differ from traditional implant-abutment cold welding?

In the context of Passivity Plus™, cold welding refers to the mechanical joining of two precisely matched conical titanium surfaces (5° per side) pressed together under proper torque, creating an extremely tight, friction-locked connection. This metal-to-metal engagement distributes load throughout the structure and prevents the micromovement that leads to screw loosening.

Importantly, this is NOT a permanent metallurgical bond. The screw releases normally when unscrewed, allowing the self-adjusting mechanism to reset and be engaged again.

How It Differs From Traditional Implant-Abutment Cold Welding

While many conical implant systems use cold welding at the implant-abutment interface, Passivity Plus™ locates the cold weld inside the prosthetic component itself. This internal positioning is what allows the self-adjusting mechanism to remain functional until final torque is applied.

Aspect Traditional Conical Connection Passivity Plus™
Cold weld location Between the implant and the abutment Between the screw body and internal base walls
When screw is removed Abutment stays in the implant All components release cleanly
Effect Abutment can stay "stuck" Base components regain flexibility
Self-adjusting function Not available Preserved until final torque

This design distinction is what makes Passivity Plus™ unique: the cold weld provides long-term stability without compromising the system's ability to compensate for minor misfits during seating.

 

Additional Resources

For more information concerning Passivity Plus:

 

Contact Information

For help implementing Passivity Plus to your next case, contact ROE Dental Laboratory: