Apparatus for use in implanting a tooth implant comprising: a fiducial marker carrier containing a plurality of fiducial markers; characterized by: at least one attachment element including an anchor portion configured for anchoring in an at least partially edentulous patient's jaw bone and an attachment portion, the at least one attachment element comprising at least three jaw bone fasteners distributed at positions on a plane such that whenever the carrier bearing the plurality of fiducial markers is remounted onto said at least three jaw bone fasteners, the carrier is prevented from rotating outside of the plane and the plurality of fiducial markers regains a same spatial position relative to the at least partially edentulous patient's jaw bone the fiducial marker carrier including at least one mounting portion configured for removable and replaceable mounting onto said at least three jaw bone fasteners in a precisely repeatable position with respect to said the at least partially edentulous patient's jaw bone, the fiducial marker carrier configured to be removable and replaceable into the precisely repeatable position without having to remove the at least three jaw bone fasteners from the at least partially edentulous patient's jaw bone. a fiducial marker carrier containing a plurality of fiducial markers; characterized by: at least one attachment element including an anchor portion configured for anchoring in an at least partially edentulous patient's jaw bone and an attachment portion, the at least one attachment element comprising at least three jaw bone fasteners distributed at positions on a plane such that whenever the carrier bearing the plurality of fiducial markers is remounted onto said at least three jaw bone fasteners, the carrier is prevented from rotating outside of the plane and the plurality of fiducial markers regains a same spatial position relative to the at least partially edentulous patient's jaw bone the fiducial marker carrier including at least one mounting portion configured for removable and replaceable mounting onto said at least three jaw bone fasteners in a precisely repeatable position with respect to said the at least partially edentulous patient's jaw bone, the fiducial marker carrier configured to be removable and replaceable into the precisely repeatable position without having to remove the at least three jaw bone fasteners from the at least partially edentulous patient's jaw bone. at least one attachment element including an anchor portion configured for anchoring in an at least partially edentulous patient's jaw bone and an attachment portion, the at least one attachment element comprising at least three jaw bone fasteners distributed at positions on a plane such that whenever the carrier bearing the plurality of fiducial markers is remounted onto said at least three jaw bone fasteners, the carrier is prevented from rotating outside of the plane and the plurality of fiducial markers regains a same spatial position relative to the at least partially edentulous patient's jaw bone the fiducial marker carrier including at least one mounting portion configured for removable and replaceable mounting onto said at least three jaw bone fasteners in a precisely repeatable position with respect to said the at least partially edentulous patient's jaw bone, the fiducial marker carrier configured to be removable and replaceable into the precisely repeatable position without having to remove the at least three jaw bone fasteners from the at least partially edentulous patient's jaw bone.