I have a new patient and she said that she had these implants placed in 2003 and said she thought they were Zimmer, but not 100% sure. I would like to use Locator overdenture attachments to increase the retention. I tried to unscrew the attachments from the implants but my 1.2 hex driver wouldn’t even fit to the screw hole on the top of the attachment. Any suggestions on to how remove the attachments? Maybe use my piezo with counterclockwise rotation? Is this is a Zimmer implant?