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17 CASE STUDY Prosthetic restoration Impressions were taken of the implants using Impregum ™ (3M Espe) four weeks after surgery with mucosal conditions completely free of irritation. The path from the intraoral situation to the master model follows an intuitive work ow and does not require the implant base to be removed. Two multifunctional caps are included as standard with each iSy implant along with the pre-drill and the cover cap. As well as conventional pick-up impression taking, the multifunctional caps can be used as scan bodies, for immediate temporary restorations, or even coding of bite regis- trations. For the impression taking, only the gingiva formers have to be removed using the de- tachment instrument and replaced by the multifunctional cap. Both lock in securely and index precisely on the shoulder of the factory-mounted implant base (Fig. 14 to 20) . On the prepared master model, the im- plant and soft tissue situation was digitally recorded using a Cerec scanner (Sirona), and a provisional crown was designed in region 13 (Fig. 21) . The gingiva former in region 13 was re- placed by a milled PMMA temporary resto- ration in order to individually shape the soft tissue in this area. The desired emer- gence pro le was created in the gingival mask of the master model so that it could be precisely transferred to the de nitive restoration [6]. The temporary restoration was removed from the occlusion and designed proxi- mally to assure balanced shaping and sta- bilization of the papillae during the com- plete osseointegration (Fig. 22 to 24) . In regio 26 the gingiva former could be re- positioned after the impression taking and left until the de nitive integration. The planned single-tooth restoration in the left upper jaw was implemented with a screw-retained, hybrid abutment crown made of IPS e.max ® CAD with the design and fabrication of the molar crown carried out completely using the CAD/CAM proc- ess with a Cerec milling unit [7, 8]. Generally, the screw channel is rst sealed with a temporary light-curing composite to ensure the xing screw remains easily ac- cessible until the rst check-up if required. The channel is then sealed with a tooth- colored composite. One of the major advantages of hybrid restorations is the precise factory t of the connection of the titanium base to the ceramic block fabricated in the CAM proc- ess. The connection is assured precisely using indexing and it allows the fabrication of both screw-retained, one-piece restora- tions and individual mesostructures. The crown is also cemented on the base ex- traorally. This allows any residual cement to be easily removed and the transition can be beautifully polished [9, 10]. IPS e.max ® CAD is a lithium disilicate (LS2) glass ceramic with a very high tensile strength (360 MPa) and not only for this reason is it one of the main components for CAD/CAM fabricated single-tooth restorations in our clinic since its market introduction. Fig. 16: Using the handle, the mounted gingiva formers were removed. Fig. 17: The iSy implant base remained in the implant… Fig. 18: …and the multifunctional cap was simply attached for the impression taking. Fig. 11: Seven days after the surgical proce- dure the sutures were removed. Fig. 12: The soft tissue was completely free of irritation. Fig. 13: Four weeks postoperative the patient attended for impression taking for a temporary restoration.