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What is the patented washer in Passivity Plus™, and how does it create a stress-free passive fit?

The washer around the screw head is the cornerstone innovation of Passivity Plus™, described by the inventor as "the most important creative thing in all the patent" and "the big game." It is the component that makes a true passive, stress-free fit possible.

The Problem It Solves

When any screw is tightened, the thread geometry naturally centers everything beneath it. Without intervention, these centering forces would negate the compensating adjustment achieved by the pivotable cap, pulling the prosthesis back into a stressed position.

The Solution

The flexible washer allows the screw head to remain off-center (tilted) even when fully torqued. This preserves the adjusted, compensated position established during seating, so no stress is transferred to the implants, prosthesis, or surrounding structures.

Visual confirmation: After full torque, the screw head may appear slightly tilted rather than perfectly centered. This is normal and indicates the washer is functioning correctly.

How the Washer Enables Stress-Free Fit (Stage by Stage)

Stage What Happens Role of the Washer
During seating The pivotable cap adjusts to compensate for minor misfits Allows free movement of the cap
During torque Screw threads and cold welding generate centering forces Absorbs centering forces, keeping the screw head off-center
After torque The adjusted position is locked in place Preserves the compensated position without stress transfer

Result: The prosthesis maintains its compensated position with no stress on the implants, base, or surrounding structures, which is the foundation of Passivity Plus™'s passive fit performance.

Additional Resources

For more information concerning Passivity Plus:

 

Contact Information

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