Implants

I 35implants1_2013 research_ Impression and registration I in cases where part of the natural dentition is periodontally stable and can be applied as abutments. In these cases, the immedi- ate full denture can be designed as a cover denture. From this cover denture, a DentDu could be fabricated and further used as de- scribed above (Figs 13a–c). Porcelain is a possible material for ve- neering of fixed-denture frameworks. If the angulation of the implants does not allow for taking impressions in the above- described way and an open-tray impression is preferable, fenestrations can be fabricated into the DentDu (Fig 14). _Discussion The reconstruction of the fully edentu- lous arch with implant-retained dentures necessitates thorough planning and a pre- cise and passive fit of the suprastructure. A previous study demonstrated that a passive fit between the implant superstructure and the underlying abutments is essential for the long-term success of the implant pros- thesis.5 To achieve a passive fit, an accurate positioning of the implant replicas in the master cast must be assured. The impression technique and the splinting of the implant copings are factors which may contribute to errors in the final positioning of the im- plant analogues, thus leading to inaccura- cies in the fit of the final superstructure.5-10 Furthermore, the angulation or proximity of the implants may inhibit proper seating of the impression copings and/or caps, which may also have a detrimental effect on the registration of the implant position.11 The precise recording of the maxillo- mandibular, eg interocclusal, relationship is a prerequisite for achieving proper occlu- sion and a successful treatment outcome.1,10 The initially delivered denture allowed for the correction of the interocclusal relation- ship, tooth shape and colour and angula- tions during the entire healing period. In this way, the patient was able to acclimatise to the function and aesthetics of the denture. In the method described in this report, an accurate impression and recording of the Fig. 9a Fig. 9b Fig. 9c Fig. 9d Fig. 10 Fig. 11a Fig. 11b Figs. 9a–d_Final telescopic crown retained implant denture, palatal; (a), anterior teeth (b), right side (c), left side (d). Fig. 10_Placement of the electroformed copings into the frame. Figs. 11a & b_A case of fixed implant retained denture for the maxilla full-arch rehabilitation: trial of the mock-up (a) and the milled temporary fixed denture is placed on the abutments (b).