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ePaper created 2017-08-25, 17:58:13 | version 1.38.0
| industry report metal-free restorations TRINIA— Metal-free restorations Authors: Prof. Rolf Ewers, Paolo Perpetuini, Dr Vincent J. Morgan, Prof. Mauro Marincola, Richard Wu & Dr Rudolf Seemann, Austria/Italy/USA Introduction There are several reasons not to use dental resto- rations made of metal. Possible disadvantages of metal are, for instance, the potential allergenicity (type IV allergy) and weight, density, as well as the long processing time. Furthermore, the colour of metals differs visibly from gingiva and teeth. Metal has in fact a great strength, but it is, however, much harder than the natural tooth. Metals are very good thermal conductors and isolate from temperature much worse than teeth. Every patient with deep fill- ings or cast gold inlays probably knows about these properties. For the named reasons, the problematic aesthetics of metals and their alloys as well as their mechanical properties, the search for other materials has not ended yet. Furthermore, allergological and biological concerns of patients and doctors have gained more importance in the last years. Fig. 1: TRINIA products. Fig. 2: Set-up for measuring flexural strength. TRINIA was developed to provide dentists with Fig. 3: CAD-based planning. CAD/CAM-milled metal-free restorations. This report presents TRINIA, a metal-free fi- bre-reinforced CAD/CAM material. Due to its flex- ural strength, it is comparable to dentin and simu- lates the function of Sharpey’s fibres. Its properties provided excellent results for 101 bridges and full- arch prostheses in a period of up to 64 months with very little complications. The following case pres- entations demonstrate the elegant CAD/CAM planning and milling procedures for difficult situ- ations like the treatment of extremely severe max- illary and mandibular atrophy (class VI). The con- currence of the flexural strength of TRINIA and the attributes of the short Bicon implants provided successful results for our treatment of atrophic maxillae and mandibles with minimal implant losses and 100 per cent successful full-arch TRINIA prosthetic treatments. Material properties TRINIA CAD/CAM discs and blocks (Fig. 1) are com- posed of multidirectional interlacings of fibreglass and resin in several layers.1 In addition to the advan- tage of being a lightweight, TRINIA has great flexural Fig. 1 Fig. 2 Fig. 3 32 CAD/CAM 3 2017