1. A method for implanting a tooth implant in an at least partially edentulous patient comprising the steps of: anchoring at least one attachment element in a patient's jaw bone; removably and replaceably mounting a carrier assembly bearing at least one fiducial marker onto said at least one attachment element in a precisely repeatable position with respect to said patient's jaw bone; employing said carrier for providing registration between said at least one fiducial marker and said patient's jaw bone; and implanting said tooth implant by employing a tracking system which uses said registration to guide a drilling assembly.