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Zirconia and Zls Lights and shadows of two ceramic nanostructured dental materials

Abstract

Tonino Traini

In dentistry, metal-free prosthetic restorations have emerged as a viable treatment option showing increased aesthetic properties and adequate mechanical behavior over classical metal ceramic restorations. Among other metal-free materials, polycrystalline nanomaterials such as yttria-tetragonal zirconia polycrystal (YTZP) has excellent mechanical properties, with a broad range of indications ranging from frameworks for monolithic multi-element bridges to frameworks for single tooth crowns. Although in the last years new high translucency stabilized zirconia have been introduced for monolithic full contour restorations, they remain predominantly opaque moreover, YTZP restorations showed a considerable clinical rate of chipping and delamination of the veneered glass-ceramic. The zirconia-reinforced lithium silicate (ZLS) is a new ceramic nanomaterial recently introduced in dentistry. ZLS is based on a lithium-metasilicate (Li2SiO3) glass ceramic and reinforced with about 10% of zirconium dioxide (ZrO2)30) that, after final crystallization process, leads to the formation of fine grained nanostructure (Li2O-ZrO2-SiO2). The presentation will focuses  lights and shadows of the two materials and their clinical performances in dentistry. Finally, will be stressed the role of the biomimetics as  guideline for development of new dental materials.

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