From the laboratory to the authorized milling center
Since 2014, selected milling centers can have their manufacturing processes validated in the context of a VITA authorization program. For this purpose, the software and hardware used are qualified and validated for ideally attuned processes and the processing of selected VITA CAD/CAM materials. In the interview, MDT Rigo Dombrowski and CDT Anja Dombrowski-Wagner (Bio Dental Art, Gladbeck, Germany) report on the advantages that this program offers dental manufacturing centers.
DV: Mr. Dombrowski, why have you had your milling center validated?
MDT Rigo Dombrowski: We saw the chance to further improve the quality of our CAD/CAM-manufactured restorations. Even the system qualification showed us potential for optimization. Through the precise, fine attunement of CAD/CAM materials and processes, it is ensured that we, as a milling center, can exhaust the full potential of the VITA materials. It is not just us who are profiting from this, but also our customers and patients.
DV: Ms. Dombrowski-Wagner, what processes and materials have been validated?
CDT Anja Dombrowski-Wagner: We decided to have the procedure surrounding the processing of the pre-shaded zirconia blanks VITA YZ (in the T and HT variants) validated. We use these in the disc geometry for the manufacture of crowns and bridge frameworks, Maryland bridges and monolithic restorations. For the design and manufacturing process we use scanners and CAD software from 3Shape (3Shape, Copenhagen, Denmark), the CAM software ZYKLONcam (KON-AN-TEC, Münster, Germany) and various CAM systems, which have been appropriately qualified.
DV: Mr. Dombrowski, why do you use VITA zirconia?
MDT Rigo Dombrowski: We have tested many zirconias from different manufacturers and price classes in recent years. These tests have shown that, cheaper blanks in particular, frequently show quality fluctuations. Above all, the stability of the materials varied perceptibly depending on the batch, and this affects the milling results. Based on our findings, we chose VITA YZ. The reasons for this, in addition to the consistently high quality, was the excellent experience we've had with other VITA products, and the fact that the blanks are produced in Germany.
Originally published: ZAHNTECH MAG 19, 6, 458–459 (2015)
INFO: VALIDATION BY VITA – HOW DOES IT WORK?
1. In the first step, the CAD/CAM system used is qualified. For this purpose, VITA cooperates closely with various system providers (scanners, CAD-/CAM software and CAM systems) in order to further develop milling strategies, for instance, and optimize processes and results.
2. In the second step, selected VITA CAD/CAM materials are validated. To this end, restorations and test specimens were produced by the milling center in accordance with defined STL data, which then undergo numerous tests to check quality, fit and mechanical properties of the manufactured objects.