Question: What is a loose implant abutment and how is it fixed?
Explanation: The abutment is the connector between the implant fixture in bone and the crown on top. When its retaining screw loosens, the crown and abutment move together as a unit. It feels similar to a loose crown but the fault lies deeper. Diagnosis requires removing the crown to access the abutment screw. The screw is then replaced, ideally with a new one, and torqued to the manufacturer’s specification. The bite is checked and adjusted to remove any overloading contact. Persistent loosening suggests a design or occlusal problem.
Related Questions:
How is a loose abutment different from a loose crown?
With a loose crown, the crown moves against a stable abutment. With a loose abutment, both move together relative to the implant. Radiographs and clinical testing distinguish them. The treatment differs, so accurate diagnosis matters before anything is retightened.
Should the abutment screw be reused after loosening?
Best practice is to replace it. Screws undergo plastic deformation when torqued, and a screw that has loosened has already been subject to cyclic fatigue. New screws are inexpensive relative to the consequence of a fracture inside the implant.
Why is torque so important with implant screws?
Correct torque creates a preload that clamps the joint and resists loosening under function. Under-tightening leaves the joint vulnerable. Over-tightening risks stripping threads or fracturing the screw. Manufacturers specify a precise value, applied with a calibrated torque wrench.
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