How do you re-thread a dental implant?

I have a patient with a Noble Biocare external hex implant fixture. The abutment screw looks fine, but I am unable to screw it into the implant fixture. I have tried the screw in another implant fixture and it works great. I think the implant might be cross threaded. How do you re-thread the implant?  Is there a special tool for this and if so, where do I obtain this?

5 thoughts on “How do you re-thread a dental implant?

  1. sb oms says:

    In most situations like this that I have seen, there was some debris in the threads that prevented the abutment screw from seating. Remember that the abutment screw is softer than the implant threads, and if a screw becomes loose, a piece of it can shear off.
    I’m sure you’ve taken an x-ray to check for anything visible.
    Blast the implant with high pressure water and air,
    try a soft micro brush inside he implant to see if you can dislodge anything.

    If it comes to re-tapping,
    Contact your nobel biocare rep, there is an implant specific screw tap.
    this is very technique sensitive, and the patient must know that their implant may need removal.
    I would practice on an analog before doing this in a patient. If its a posterior implant, it will be more difficult due to access and angles.
    good luck, consider referral if uncomfortable

  2. ali sawas says:

    In this case you should use tapping instrument hss 2mm diameter 0.4 thread .
    Slowly rotate it clock & clockwise using also olive oil during tapping .then rinse the implant inside by water and air, then try the screw .

    Good luck
    Dr. M.Ali Sawas

  3. LCM says:

    Just to be sure, you did take a PA to make sure there isn’t a fractured
    screw segment still stuck inside the implant? What was the reason the
    abutment is being replaced at this time?

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