Three-Point Bending Tests of Zirconia Core/Veneer Ceramics for Dental Restorations

Three-Point Bending Tests of Zirconia Core/Veneer Ceramics for Dental Restorations

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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 Animatronic 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 L-Carnitine 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.