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International Journal of DentistryVolume 2013 2013, Article ID 831976, 5 pages

Research Article

Biomedical Section, Tecnologica Research Institute, Via E. Fermi, 88900 Crotone, Italy

Department of Mechanical Engineering, University of Calabria UniCAL, 87136 Arcavacata, Cosenza, Italy

Department of Dental Sciences and Surgery, University of Bari, 70124 Bari, Italy

Received 31 July 2012; Revised 1 October 2012; Accepted 14 January 2013

Academic Editor: Brian W. Darvell

Copyright © 2013 Massimo Marrelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. The mechanical strength and the surface hardness of commercially available yttrium-doped zirconia were investigated. Furthermore, a comparative study of eight different ceramic veneers, to be used for the production of two-layered all-ceramic restorative systems, was carried out. Materials and Methods. Four types of zirconia specimens were analyzed, according to a standard ISO procedure ISO 6872. Besides, two-layered zirconia-veneer specimens were prepared for three-point bending tests. Results. A strong effect of the surface roughness on the mechanical strength of zirconia specimens was observed. Finally, a comparative study of eight commercially available veneering ceramics shows different modes of failure between the selected veneers. Conclusion. The results indicate that close attention should be paid to the preparation of zirconia-based crowns and bridges by CAD-CAM process, because surface roughness has an important effect on the mechanical strength of the material. Finally, the results of the mechanical tests on two-layered specimens represent an important support to the choice of the veneering ceramic.

Autor: Massimo Marrelli, Carmine Maletta, Francesco Inchingolo, Marco Alfano, and Marco Tatullo



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