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Dental Tribune Middle East & Africa No. 5, 2017

B2 ◊Page B1 LAB TRIBUNE Dental Tribune Middle East & Africa Edition | 5/2017 Fig. 4: The materials portfolio from Ivoclar Vivadent is immense. Therefore, the selection and combination possibilities are extensive. While this stage is easier for the convention- al group, since they are using IPS e.max Press and the associated ingots, the CAD/ CAM team should also be thinking about using monolithic and individually characterized IPS e.max ZirCAD zirconium oxide restorations. Fig. 5: Ready, steady, go: At ten o’clock sharp the participants are allowed to see the models of the case. These include a study model of the provisionally restored upper jaw and a silicone matrix, a sawcut model of the prepared upper jaw as well as model of the lower jaw. Fig. 6: The CAD/CAM laboratory group has selected the digitalized situation and generated the case in the system. In other words, the teeth to be restored and the restorations have been defined in the soft- ware. The picture shows Davor Markovic studying the case. Fig. 7: The dental technicians provide the photographer with a lot of very interest- ing material. The dies are prepared for the creation of the restorations and the silicone matrices have been adjusted ac- cordingly. Fig. 8: The patient is prepared for the digi- tal capturing of the intraoral data in the practice facilities of the ICDE in Vienna. Dr Petr Hajný, the dentist, and Vjekoslav Bu- dimir, the dental technician, prefer to pur- sue a digital approach. As a result, scans are conducted with two different systems. Fig. 9: Dr Petr Hajný and his assistant scan the patient’s jaw with the CEREC Omni- cam (Dentsply Sirona), an intraoral dental scanner which, like the Trios machines (3Shape), does not use powder. He takes advantage of chairside workflows to de- sign the crowns and mill them from IPS e.max CAD MT A1. Fig. 10: CAM software of the Wieland Ze- notec select CAD/CAM system with the IPS e.max block in the block holder. Fig. 11: Completed, milled crown made of IPS e.max CAD MT blocks in the CAD/CAM milling machine Fig. 12: Busy and highly concentrated con- testants in the training laboratory of the ICDE in Vienna: The CAD/CAM group in the front and the conventionally working group at the back. Fig. 13: There’s also time to have some fun. The contestants from the different teams and countries get on very well with each other. Fig. 14-17: The modelled crowns, reduced crowns and frameworks are conventionally invested, placed in the pre- heating furnace, pressed, divested and then completed. The participants are well-versed in this technique and achieve the desired results in no time at all. Fig. 18: “Look, I’m a human milling machine!” Velimir Žuji´c (right) jokes around with Vinko Iljadica and Alen Ali´c (left). Fig. 19 and 20: Manual finishing techniques: Velimir Žuji´c sprinkles dentin powder on an IPS e.max Press framework that has been coated with IPS Ivocolor® Mixing Liquid allround. In the wash firing cycle, the bond is reinforced and pro- duces a sound base for the subsequent ceramic layers. Fig. 21: Irrespective of whether a conventionally or CAD/ CAM- fabricated framework is used, these types of restorations, in con- trast to monolithic ones, have to be manually layered and fired multiple times. Fig. 22a and 22b: From the computer to the hand: Some of the technicians of the CAD/ CAM group decided to choose the monolithic route. Nevertheless, they are doubtful about being able to outcompete the manual group. They would have to wait until the end to find out if their doubts were justified. Fig. 23: Dr Petr Hajný adds fine surface details to his milled lithium disilicate crowns before he finalizes them in a modified crystallization and glaze firing cycle. His chosen workflow makes him the fastest contestant and leaves him with enough time to take care of other business. ÿPage B3

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