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EFFECT OF TOOTHBRUSHING AND STAINING METHODS ON OPTICAL AND MECHANICAL PROPERTIES OF MONOLITHIC ZIRCONIA

Abstract

The zirconia increased the use of metal-free restorations by associating aestehtic provided by its white color with satisfactory mechanical properties. Initially, opacity of zirconia caused by its high cristaline content required a porcelain veneer applied on the copings and frameworks to reproduce appearance of natural teeth. However, problems, such as delamination and fracture of porcelain veneer, promote search for high-translucent zirconia for using as monolithic restorations. Monolithic restorations present the advantages of simplifying the construction process and preserving tooth structure once minimal wear is required due to lower thickness of restorations. The reproduction of natural teeth through monolithic restorations requires coloring techniques to feature them. There are two methods to reproduce color of natural teeth: the use of intrinsically shaded zirconia blocks at colors of VITA scale, and the use of high translucent zirconia blocks that are extrinsically colored before sintering. There is the possibility of using corrective stains to adjust color of monolithic restorations after sintering. There is not a consensus about the effect of these coloring methods on optical and mechanical properties of monolithic restorations and their wear resistance. Additionally, the effect of toothbrushing on color stability and mechanical properties of monolithic zirconia colored by different methods is unknown. Thus, the aim of this study is to evaluate the effect of coloring methods and toothbrushing on optical and mechanical properties of monolithic zirconia. (AU)