In a CAD/CAM process to make a tooth crown, the raw un-machined crown block (10) is has a peg extension (11) that is clamped in a tool. The block has an implant attachment connector fitting (14) incorporating an implant fixture for attachment to an implant head. The peg (11) extends from one surface while the connector fitting is located on a second face (13) at right angles to the first (12).