CAD/CAM - international magazine of digital dentistry

I 29 case report _ guided surgery I CAD/CAM 1_2014 dinegelandalight-curingcomposite.10 Thetempo- rary restoration remained in place for six months (Fig. 22). Finalrestoration The existing metal–ceramic veneer crowns in positions 32 to 42 were removed and the teeth pre- pared again. For impression taking, the impression posts were laboratory customised to correspond with the gingival emergence profile created by the Multi-Base Abutments. This was followed by a single-session, two-phase impression using the double-mix technique with a polyether impression material11, 12 (Fig. 23) and corresponding colour and shade selection. Inordertocontinuesupportoftheideallyshaped soft tissue (Figs. 24 & 25), a decision was made in favour of CAD/CAM customised abutments made of zirconium dioxide. The basal component of the future mesostructures was designed such that the gingiva would be supported optimally and create an ideal transition from the implant connection to the bridge contour. After a pronounced temporary break,onenolongerneedstoexpectchangestothe gingival margin. Thus, the future crown margin was placed only 0.5 mm sub- and epigingivally.13 The wax model (Fig. 26) on auxiliary parts, which corresponded to the implant connection, was digitalised using the StraumannCARESScanCS2scanner.Afterdatatrans- mission,thefabricationoftheindividualabutments was performed in the Straumann milling centre. In order to ensure the required fit and the stability needed for the molar region, one-piece zirconium dioxideabutments(Figs.27&28)14,15 werefabricated. After a few days, the dental technician received the patient-specific abutment for further process- ing. In the next step, a zerion veneering framework (Straumann) was designed using CAD/CAM and fabricated after data transmission (Figs. 29 & 30). The zirconium dioxide abutments were inserted at a torque of 35 Ncm (Figs. 31 & 32). Fig. 31 Fig. 28 Fig. 25Fig. 23 Fig. 24 Fig. 26 Fig. 27 Fig. 29 Fig. 30 CAD0114_26-30_Fangmann 14.04.14 11:49 Seite 4