Based on the "jack-screw" principle, the Metalift system works by drilling a precision channel through the occlusal surface of a cast restoration, then with a special bur, the area around the periphery of the hole is undermined before a threaded screw is wound into the space.
As the screw comes in contact with the core of the restoration, the continued rotation of the screw results in a jacking force that displaces the crown from the preparation.
This system can be used to remove both all metal crowns and metal-ceramic crowns, although, with metal-ceramic crowns care should be taken to remove enough ceramic from the area where the hole created to reduce the chances of fracture.
The minimum thickness of metal required for the lifting action is approximately 0.5mm.
The damage can repaired with a plastic filling material.
Based on the "jack-screw" principle, the Metalift system works by drilling a precision channel through the occlusal surface of a cast restoration, then with a special bur, the area around the periphery of the hole is undermined before a threaded screw is wound into the space. As the screw comes in contact with the core of the restoration, the continued rotation of the screw results in a jacking force that displaces the crown from the preparation. This system can be used to remove both all metal crowns and metal-ceramic crowns, although, with metal-ceramic crowns care should be taken to remove enough ceramic from the area where the hole created to reduce the chances of fracture. The minimum thickness of metal required for the lifting action is approximately 0.5mm. The damage can repaired with a plastic filling material.
Crown (dentistry)