Dental bridge preparation. Close-up of dental impression transfer posts on dental implants in a 45-year-old woman with missing teeth. Three implant fixtures have been surgically embedded into holes drilled in the patient's jawbone. Impression transfer posts, seen here, have been mounted on the implants. These posts are used when making an impression (a dental mould) of the surrounding teeth and the implants. The impression is used to make properly shaped and aligned crowns, which are then mounted on the implant fixtures. For a sequence showing the preparations and surgery for this dental bridge, see images C047/4693 to C047/4697.