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ePaper created 2017-08-25, 17:58:13 | version 1.38.0
metal-free restorations industry report | Fig. 4a Fig. 4b Fig. 5 strength and a flexural modulus of elasticity similar to dentin. The flexural strength is determined by means of the loading device in the classical three-point bend- ing test (Fig. 2). The tested material—in this case TRINIA—bends under load. As long as the material does not deform under load i.e. returns to its origi - nal form when the force declines, it remains within the elastic range. If the acting force exceeds the load limit, the material deforms (plastic range) and breaks in the end. The range when that happens to TRINIA is similar to that of dentin. In other words: The flexural modulus of elasticity of TRINIA is 18.8 GPa, com- pared to that of dentin being 12–14 GPa2 and of titanium being 102–118 GPa.3, 4 As TRINIA features a flexural modulus of elasticity that is comparable to dentin, it will behave similarly. TRINIA is an American product for per manent resto- rations approved by the FDA. Fibre- reinforced com- posites (FRC) by TRINIA are composed of 40 per cent of epoxy resin and 60 per cent of fibreglass. Its most outstanding characteristics are the great elasticity featuring a flexural strength of 390 MPa (N/mm2) and very low water adsorption of 0.03 per cent. Because of the high level of resilience of TRINIA material, every construction or bridge construction features the so-called buffering, comparable to the effect of Sharpey's fibres. The bond of TRINIA and abutments is very stable and reaches 18 MPa with 3M RelyX Unicem 2 Automix and 18.6 MPa with Cera Resin Bond (SHOFU).5, 6 TRINIA CAD/CAM The relatively simple design and manufacture of prosthetic constructions using CAD techniques is a good alternative to conventional methods (Fig. 3). TRINIA can be machined with customary wet- or dry-milling machine systems using nano-diamond burs (Figs. 4a & b, 5). TRINIA is suitable for making copings, substructures or frameworks for permanent and transitional anterior or posterior crowns, bridge- work, and sub structures on natural teeth or implants. TRINIA constructions can be used either with ce- mented or uncemented restorations as well as with screwed or telescopic restorations (Figs. 6 & 7). The versatility of TRINIA material permits the use for per- manent supply with e. g. inlays, onlays, crowns, bridges, veneers or partials. The material is supplied in ivory and in pink (Fig. 8). Figs. 4a & b: CAM-based milling. Fig. 5: TRINIA disc after milling. Fig. 6: Completed TRINIA construc- tion. Fig. 7: Frontal view on the TRINIA prosthesis. Fig. 8: Palatine view on a completed, TRINIA prosthesis. Fig. 9: Panoramic radiograph of a 59-year-old female. Fig. 10: Plaster model. Fig. 11: Caudal view of the completed prosthesis. Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 Fig. 11 CAD/CAM 3 2017 33