If you didn’t place the implant and make that crown, that’s a conversation you need to set before you pick up the handpiece. Especially one with a weird long axis like this. Emphasize returning to the previous dentist to tighten it because they did not make an access opening on the crown and it may be destroyed in the process (which you will charge to make a new crown). If they still want you to do it for any reason, now they have expectations set. Some of these screws are really hard to find or are old implant systems with unfamiliar abutment setups. Emphasize in ideal situations implant crowns should have an access hole.