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Why do dental implant screws loosen? In most cases, screw loosening is not caused by the implant “failing”, but by mechanical overload, prosthetic misfit, bite imbalance or maintenance issues. It is a problem that should be assessed promptly, because ignoring it can lead to wear, fracture or damage to the prosthetic restoration.
Patients are often alarmed when the crown starts moving and assume the implant itself has come loose inside the bone. That is not always the case. In many situations, what has loosened is the prosthetic screw or the prosthetic assembly, not the implant fixture integrated into bone.
At Asensio Dental Clinic, we assess whether the problem is biological, mechanical or prosthetic before deciding how to correct it.
The most common causes of implant screw loosening
What should you do if the screw feels loose?
If the crown or prosthesis starts moving, do not continue chewing on it as if nothing happened. Continued loading can worsen the problem and may fracture the screw or damage the restoration.
The correct step is to arrange a review with your implant dentist as soon as possible so the prosthesis can be removed, inspected and retightened or repaired if appropriate.
Can screw loosening be prevented?
Prevention depends on good planning and follow-up:
Patients who grind their teeth may also need a night guard to reduce overload on the implants.
Does a loose screw mean the implant has failed?
Not necessarily. A mechanical prosthetic problem is very different from loss of osseointegration. The dentist must distinguish between:
| Problem | What it usually means |
|---|---|
| Loose crown/prosthesis | Often a prosthetic or screw issue |
| Mobile implant in bone | Possible biological failure, requires urgent assessment |
Frequently asked questions about loose implant screws
Can I tighten it myself?
No. Implant screws require proper instruments, torque control and professional inspection.
Will the screw need replacement?
Sometimes retightening is enough. In other cases, the screw or prosthetic components must be replaced.
Is this a common problem?
It can happen in implant dentistry, especially in cases with high bite forces or prosthetic overload. The important thing is to address it early.
Can it happen again?
Yes, if the underlying cause is not corrected. That is why the dentist must identify whether the issue is occlusal, mechanical or design-related.