Broken Abutment

Dr. White asks:

I have had two patients ‘break’ the abutment about half way down the dental implant.

I have tried to unscrew the segment but it’s torqued in
place. Tried to reset the upper part of the prep but not enough screw
threads available. Please help. How do I remove this? What should I do to correct the situation? The dental implant is not the problem. It’s in tight. Any advice would be appreciated.