What does “Implant screw loosening” mean?
Implant screw loosening is a mechanical problem in which a screw securing an abutment or prosthesis loses tightness and the connected components move.
How the screw maintains fixation
Tightening to the specified force creates tension in the screw that holds components together. Insufficient tightening, inaccurate connection fit, and repeated forces can lead to loosening. Screw loosening and screw fracture are distinct conditions.
Identifying the moving part and cause
There may be rattling during chewing or movement of the tooth-shaped prosthesis. The dentist identifies whether the prosthesis, abutment, or body moves and checks for screw damage, fit, and bite problems. Symptoms alone do not establish failure of the implant in bone.
When loosening recurs
Do not try to resolve it simply by tightening harder. Manufacturer tightening requirements and component condition are checked, with replacement or bite adjustment considered when needed. Do not insert tools or use adhesive yourself; have the loose area assessed to limit further damage.
Frequently Asked Questions
Does tightening the screw solve it immediately?
It may be secured again if there is no damage and the cause is corrected, but recurrent loosening requires assessment of connection fit, bite, and screw damage together.
Does a loose prosthesis mean the implant must be removed?
If only the screw is loose, it may be managed without removing the body. Osseointegration and surrounding bone are assessed separately.
Questions about implant screw loosening
Learn what the term means and how it relates to your dental condition.
- Sufficient understanding
Which screw has loosened?
Explanation and evidenceDistinguish abutment and prosthesis connections and check damage to decide between refixation and replacement.
Association of Dental Implantology · Preload - A choice suited to your condition
Does the implant body move too?
Explanation and evidenceProsthesis movement must be distinguished from movement of the body in bone to establish the treatment extent.
US Food and Drug Administration · Dental Implants: What You Should Know
