I had bone grafting right after extraction. Implant screw was placed 3 months ago.

Hi:This is rare but possible that an implant under the gum with bone graft needs to be exposed by removing some bone.  Best,Dr. Maddahi

Hello,It is not uncommon to remove bone when exposing the implant for the final restoration. Sometimes the bone surrounding the implant prevents the prosthesis to fully seat and necessitates the need for removal of excess bone. It is usually a very small amount of bone that is removed.Hope this helps,Dr. Mazaheri

Bone isn't exactly easy to grow, so a doctor will typically place more bone graft material than they expect to grow. You're very fortunate to have grown a lot of good bone! Sometimes some of that bone needs to be removed if it grew to well.