There can be occasions when needing to remove a crown from the abutment support that requires drilling a hole into the crown. But this appears to be a new crown that was cemented on to an abutment that resulted in open contacts, I would ask my lab to replace the crown rather than add porcelain to the contacts after placing a hole in the new crown. The original crown should have had firm contacts with the neighboring teeth at the outset. Also, many times the implant crowns are cemented with a temporary cement or implant cement product, which most times will allow the crown to be removed without having to place a hole in it. The only time I place a hole in a crown is when it has been in service for a long while where the screw supporting the abut/crown has backed out slightly allowing a rocking motion or movement. Then if I cannot take the crown off the abutment due to the motion, I will create a small hole in the top of the crown at the location of the screw head. This allows me to remove both the abutment and the crown together, inspect the issue and make my diagnosis as to why and later reseat the crown and cover the hole with a cotton pellet and composite. A composite filling is most often used to seal the hole. In the big picture, if there is an esthetic issue or the crown fractures or cracks near the hole, you could ask to change it out then.
