• Jerman, Ivan
• Mirt, Tadej
• Abram, Anže
• Jevnikar, Peter
• Kocjan, Andraž
• Velde, Nigel Van Del
• Bermejo, Raúl

Abstract

<p>The zirconia-resin adhesion, crucial in fixed dental prostheses, may be mechanically enhanced by airborne-particle abrasion (APA) induced surface roughening. APA may substantially increase the strength of 3Y-TZP, which is associated with (sub)surface compressive residual stresses through t-m phase transformation. In this work, the effects of APA and regeneration firing (RF) (1000 °C, 15 min) of various zirconia dental ceramics containing 3–5 mol.% of yttria were investigated. The phase composition, (sub)surface microstructural changes, and biaxial flexural strengths coupled with Weibull statistics and fractography were analysed and compared. The results show a significant increase in strength for 3Y and 4Y specimens after APA, ascribed to the t-m transformation toughening. However, APA substantially decreased the strength of 5Y variant. After RF, the ferroelastic domain switching phenomenon was presumably the persisting mechanism to withstand the propagation of APA-induced cracks in 3Y and 4Y zirconias, not being inferior to strength values of the as-sintered counterparts.</p>

Topics

• impedance spectroscopy
• surface
• phase
• crack
• strength
• flexural strength
• ceramic
• resin
• fractography