Comparativo por microscopia óptica da adaptação marginal em copings de zircônia CAD-CAM e e.max injetável

Abstract

This research evaluated the marginal gap between zirconia copings, milled by CAD-CAM system and IPS E. Max Press injectables and tarpaulins by the same digital system. From acrylic resin model (Columbia Dentiform Corp, Long Island City, New York, USA) first bicuspid (convergence angle of 12 occlusal reduction occlusal of 1.5 mm at the Centre of the surface of occlusion and 1 mm shoulder chamfer depth margin on every surface and marginal vestibule), standardized array of copper was produced (height: 5.3 mm, base: 6.5 mm, axial expulsividade: 3°, occlusal taper: 6°, bevel: 0.5 mm) and from it made the copings (n = 40), divided into Group 1 (M, n = 20), Zirconia CAD-CAM (Ceramil, Amann Girrbach , Koblach, Germany) and Group 2 (DL, n = 20), IPS E.Max Press (lithium disilicate injectable) (Ivoclar Vivadent, Amherst, New York, USA), both with 4 points of reference (middle of the buccal root surface, mesial and distal palatal of teeth) for measuring. The Group 1 (M) was manufactured by CAD-CAM system (Amann Girrbach, Koblach, Germany) throughout the process and the Group 2 (DL), waxed in same system, both with internal space of 50 µm for cement. RESULT: It was obtained that the lithium disilicate used in this study had an average of 38.86 leakage ± 4.36 µm (mean ± standard error of the mean), while based on zirconia material had marginal leakage 19.02 horizontal ± 0.81 µm, significantly lower than the first type. The low leakage results probably keep relation with the use of CAD-CAM. CONCLUSION: It was concluded that both materials present within the clinically acceptable ranges, with better marginal adaptation credited to Zirconia.