I thought you might like to read the following recent articles regarding managing broken, stripped, or loose implant abutment screws.
Click here: 3 Techniques to Remove Broken Abutment Screws
Click here: Tips to Removing a crown from a tooth with a loose abutment
Click here: Dealing with a loose implant crown
Click here: 3 Techniques to Remove Broken Abutment Screws
Click here: Tips to Removing a crown from a tooth with a loose abutment
Click here: Dealing with a loose implant crown