Hydrofluoric acid etching of dental zirconia. Part 2: effect on flexural strength and ageing behavior
Journal of the European Ceramic Society(2016)
Abstract
Among the diverse treatments proposed to promote the osseointegration of zirconia dental implants, hydrofluoric acid (HF) etching appears to be a good candidate. However little is known on the effect of this process on the mechanical properties and long-term reliability. In this work, the surface integrity, the flexural strength and the ageing sensitivity of yttria-stabilized zirconia were assessed after etching in HF 40%. Results show that etching induces an increase of monoclinic phase content and a decrease in flexural strength. The strength decrease is limited to 15% for etching times below 60min, whereas it reaches 29% after 120min because of the formation of large etching pits. No substantial change in the ageing sensitivity was evidenced. Within the limits of this study, HF 40% etched zirconia appears to be reliable for long-term implantation provided that the etching duration does not exceed 60min.
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Key words
DI water,FIB,HF,LTD,SEM,Y-TZP,3Y-TZP
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