Marginal and Internal Discrepancies of Posterior Zirconia-Based Crowns Fabricated with Three Different CAD/CAM Systems Versus Metal-Ceramic

• Rocio ^[1] ; Esther ^[2] ; Miguel ^[3] ; María ^[4]
  1. [1] Ortega
  2. [2] Gonzalo
  3. [3] Gomez-Polo
  4. [4] J Suárez

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• Localización: The International Journal of Prosthodontics, ISSN-e 1942-4426, Vol. 28, Nº. 5, 2015, págs. 509-511
• Idioma: inglés
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  • Purpose: The aim of this study was to analyze the marginal and internal fit of metalceramic and zirconia-based crowns. Materials and Methods: Forty standardized steel specimens were prepared to receive posterior crowns and randomly divided into four groups (n = 10): (1) metal-ceramic, (2) NobelProcera Zirconia, (3) Lava Zirconia, and (4) VITA In-Ceram YZ. All crowns were cemented with glass-ionomer agent and sectioned buccolingually. A scanning electron microscope was used for measurements. Kruskal-Wallis and Wilcoxon signed rank test (α = .05) statistical analyses were conducted. Results: Significant differences (P < .0001) in marginal discrepancies were observed between metal-ceramic and zirconia groups. No differences were found for the axial wall fit (P = .057). Significant differences were shown among the groups in discrepancies at the occlusal cusp (P = .0012) and at the fossa (P = .0062). No differences were observed between surfaces. Conclusions: All zirconia groups showed better values of marginal discrepancies than the metal-ceramic group. Procera Zirconia showed the lowest gaps.