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ePaper created 2016-10-04, 09:33:57 | version 1.38.0
| case report full mouth restoration 34 CAD/CAM 3 2016 attributes. Similarly, the future cosmetic material must adhere precisely to the guiding assemblies. Until now the prosthodontist has sculpted the framework in wax and casted it in alloy before ad- justing and surfacing it. During the wax modelling process, he would also use models mounted on the articulator, with silicone keys representing the volume of the appliance to ensure that the frame- work had a good homothetic reduction. Nowadays, with CAM/CAD, it is essential to scan the aesthetic assembly or the model of the appliance to allow for this homothety. Scanning Scanning entails acquiring digital data on the case. In other words, it is the stage that will make it possible to transpose the physical case (models on the articulator) into a virtual case (computer screen). For the sealed mandibular framework, scanning performed at the laboratory, using Dental Wings, a leading provider of digital dentistry tech- nologies. A recent accessory enables the different models (maxillary and mandibular with and without guid- ingassemblies)tobescannedeasilyandreliablyand todepictthemonthescreenwiththesameocclusal relationship as that determined by the articulator. It is the kit calibration for the Dental Wings scanner and a certain number of articulator brands. For the machinedmaxillaryframeworkwhichrequireseven more accuracy, it is performed at Simeda (Anthogyr CAD/CAM solution). Modelling Once the scanning stages are completed, the mod- elling or design stages can be started: marking the boundaries,choosingthesealingspacesandthede- sign.Theframeworksarecreatedonthebasisofthe masterassemblyvolumes(greentransparent(Fig.2) and blue transparent (Fig. 3)). The laboratory tech- nician uses the software to select the homothetic shrinkage parameters for the assemblies. As it is not possible to adapt the software to each specific case, the final changes must be made to each item (Fig. 4). Lastly, connectors must be de- signed. In order to obtain good rigidity, which is essential in implantology, they must be modelled to obtain a tupe of girder, which is passed from one element to another with the same diameter and height (Fig. 5). Manufacturing The Dental Wings scanner is a so-called ‘open’ sys- tem, which means that the user can freely choose the company that is going to manufacture the framework. For Cr-Co frameworks by laser micro- fusion, we use the approved production centre Bego,AdvancedDentalFactoryinMontpellier.They are in fact equipped with a machine from EOS, the Fig. 11: Anatomical silicon key. Fig. 12: Visualisation of the support and the space provided for the structure. Fig. 13: General overview of the mandibular framework. Fig. 14: General overview of the maxillary framework. Fig. 15: Both frameworks in place on the articulator. Fig. 13 Fig. 14 Fig. 15 Fig. 11 Fig. 12 32016