Implant crowns are useful in locations where a tooth is missing and we want to avoid preparing adjacent teeth for a bridge or other prosthesis. Implants can be used under complete dentures or partial dentures. Implant crowns can be described as a titanium screw that takes the place of the root of the tooth, topped with an attachment and a crown similar to the crowns that can be placed over a typical tooth. Implants are placed in the bone and usually take several months to integrate with the bone, a process known as osseointegration. Once integration has been achieved, a custom attachment, or abutment, is attached to the implant for the restorative procedure. For a single implant crown or for an implant bridge, an impression is taken and a custom abutment is fabricated with a porcelain crown. The abutment is screwed into place with the attached crown, or the crown is cemented over the abutment, depending on the restorative method indicated. Implants are very case selective and certain criteria must be met before implants are placed. Implants may not be appropriate in cases where the patient is a smoker or has certain health conditions, including periodontal disease and diabetes.