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ePaper created 2017-09-11, 09:00:39 | version 1.38.0
12 TRENDS & APPLICATIONS Dental Tribune Asia Pacific Edition | 9/2017 the In the incisal and occlusal areas, the chroma was increased and translucency was adapted in the appropriate areas. As only the buccal surfaces were veneered in this case, the frame- work volume was relatively solid. We always carry out a slow sin- tering procedure (9 h) in our laboratory for complex restora- tions, such as the reconstruction presented here. Subsequently, the surfaces of the monolithic zirconium dioxide parts were polished, paying special atten- tion to the occlusal areas. For polishing, we used polishing cones from SHOFU or anaxdent. These cones guarantee thorough polishing so that the surface can subsequently be easily polished to a high lustre. We do not use sil- icone cones or discs, as they leave residues on the surface, making the application of glazing mate- rials difficult. Areas that are dif- ficult to access during polishing are covered with a thin glaze layer. This was followed by a restora- tion try-in in the patient’s mouth. The dentist checked the occlusion and function. Veneering After conditioning of the framework parts to be veneered, a fluorescent liner (IPS e.max Ceram ZirLiner, Ivoclar Vivadent) was ap- plied; this gave the restoration fluorescence from the depths in order to achieve light effects re- sembling that of the natural den- tition. Non-fluorescent materials (e.g. pure zirconium dioxide) ap- pear dull and dark. Since the framework was already coloured, we opted for a clear liner. This ad- ditionally enhanced the light transmission and contributed to the adhesion of the ceramic ve- AD Interdental brush CPS prime Martina Hingis curaprox.com neer to the zirconium dioxide. A classic ceramic veneering build-up was then carried out. We used a special indicator (Smile Line) to mix the ceramic powder in order to differentiate the individual ma- terials better. The IPS e.max Ceram range includes Power materials, which provide an increased level of brightness, particularly for translucent framework materials. In this case, we decided to use the Power materials. A further advan- tage of the IPS e.max Ceram mate- rial is its excellent stability. The in- dividual areas do not merge dur- ing the build-up of the ceramic veneer, allowing for the exact de- sired effects to be achieved. In order to achieve the correct shape, morphology and liveliness, a sec- ond firing was necessary. The res- torations were then glazed and finished. We like to use the glaze material (IPS Ivocolor FLUO, Ivoclar Vivadent) in a creamy con- sistency. Conclusion In the design illustrated, only the buccal surfaces of the other- wise monolithic zirconium diox- ide framework are veneered. An aesthetic and durably stable result was achieved with relatively min- imal effort. The qualities of the materials are used to their full ad- vantage. These include the excel- lent light optical properties of IPS e.max Ceram, in this case espe- cially the Power materials; the high strength of zirconium diox- ide; the possibility of colouring the zirconium dioxide to achieve a warmer colour effect (white zir- conium dioxide is far too bright for this type of restoration, and re- ducing the degree of brightness would have been difficult in view of the low thickness of the veneer- ing ceramic); and the low amount of ceramic material (this allows minimal controlled shrinkage and ensures easy handling). Dr Torsten Seidenstricker is Clinical Direc- tor of the Adent Dental Clinic in Allaman in Swit- zerland. He can be contacted at t.seidenstricker@gmx.net. Master dental technician Dominique Vinci runs a private laboratory, Vinci Dental Concept, in Petit-Lancy in Switzerland. He can be contacted at Dominique@Vinci.ch.