• Mirmohammadi, H.
• Feilzer, A. J.
• Jager, N. De
• Kleverlaan, Cornelis Johannes
• Aboushelib, M. N.

Abstract

Objectives<br/>To evaluate the effect of cyclic loading on the bond strength of resin composite to zirconia framework material.<br/>Methods<br/>Bar shaped zirconia/composite specimens (2 mm × 2 mm × 25 mm) were prepared using three different resin cements and placed in a four-point bending test setup. The flexure strength (Fs) was calculated by placing the bars (n = 10) fixed between the four supports (at 10 and 20 mm) with the interface centered between the inner rollers and subsequently loaded (1 mm/min crosshead speed) until fracture. Rotating fatigue resistance (RFR) was determined in a rotating bending cantilever test setup (104, 1.2 Hz) with the highest stress located at the interface (n = 20). The RFR was determined by the staircase method and the mean RFR was calculated using logistic regression analysis.<br/>Results<br/>Resin cement composition had no significant influence on the bond strength value obtained by both Fs (F = 0.6, P ≥ 0.5) and RFR (F = 1.1, P ≥ 0.3) tests. However, after rotating fatigue testing there was a significant reduction in bond strength between 46 and 50% of the three resin cements.<br/>Conclusion<br/>Zirconia resin bond strength is liable to deterioration under the influence of fatigue.<br/><br/>

Topics

• impedance spectroscopy
• strength
• fatigue
• composite
• cement
• bending flexural test
• resin
• fatigue testing