CAD/CAM - international magazine of digital dentistry

I research _ impression and registration Fig. 1a_Full denture in situ. Fig. 1b_Duplicate (DentDu) of the interim denture. Fig. 1c_Trial of the DentDu. Fig. 2a_Placement of the DentDu in the articulator. Fig. 2b_Pick-up impression system. On the left: titanium impression post (placed on the implant). On the right: plastic impression sleeve (will be left in the impression). _Introduction Usually,afulldentureisdeliveredfollowingtooth extraction or implant insertion of a fully edentulous arch.Adentureisusuallyuseduntilthefinalrestora- tionisperformed.Awell-designedfulldentureshould fulfillthefollowingcriteria:1)correctverticalheight and maxilla-mandibular relationship; 2) accurate occlusion;3)appropriatechoiceofteethwithregard to shape, length, width and position; 4) adequate lip support, and 5) proper function and aesthetics to meet the patient’s expectations. The final resto- ration should fulfill or surpass these requirements. Obtaining a correct impression and accurately eval- uating the interocclusal relationship (e.g., interoc- clusal distance, occlusal recording and determina- tionoftheexactpositionoftheplacedimplants)are often challenging and time-consuming tasks.1 The aim of the current report is to present an impression and registration technique that allows the transfer of the interocclusal relationship, oc- clusal recording and esthetics that were initially applied to produce a full denture as a template for the reconstruction of the final full-arch implant. _Materials and Methods Followingmultipleextractionofanon-salvage- able rest dentition and the placement of six dental implants in positions #4, #5, #6, #11, #12, #13, a full denture was fabricated. After the extrac- tion sites had healed and denture sores were eliminated, the function and esthetics of the denture was optimized. If necessary, angulations, shapeandcolorofthedentureteethandtheshape of the denture base were corrected (Fig. 1a). The resulting denture was used by the patient until the final restoration was delivered. For the final restoration of the maxilla, an implant-retained denture with telescopic crowns as attachments was planned. After the implant was uncovered, the denture was modified to allow sufficient space for the healing abutments. A duplicate of the denture (DentDu) was made out of clear resin (Paladur, Heraeus, Hanau, Germany, Fig. 1b). A trial of the DentDu was performed and minor occlusal dis- crepancies were corrected (Fig. 1c). Bite records Impression and registration for full-arch implant dentures Author_Prof. Gregory-George Zafiropoulos, Germany 28 I CAD/CAM 1_2013 Fig. 2a Fig. 2b Fig. 1b Fig. 1c Fig. 1a