• Feilzer, A. J.
• Kleverlaan, Cornelis Johannes
• Aboushelib, M. N.

Abstract

Purpose: Selective infiltration etching (SIE) is a newly developed surface treatment<br/>used to modify the surface of zirconia-based materials, rendering them ready for<br/>bonding to resin cements. The aim of this study was to evaluate the zirconia/resin bond<br/>strength and durability using the proposed technique.<br/>Materials and Methods: Fifty-four zirconia discs were fabricated and divided into<br/>three groups (n = 18) according to their surface treatment: as-sintered surface (control<br/>group), airborne-particle abrasion (50-μm aluminum oxide), and SIE group. The zirconia<br/>discs were bonded to preaged composite resin discs using a light-polymerized<br/>adhesive resin (Panavia F 2.0). The zirconia/resin bond strength was evaluated using<br/>microtensile bond strength test (MTBS), and the test was repeated after each of the<br/>following intervals of accelerated artificial aging (AA): thermocycling (10,000 cycles<br/>between 5 and 55◦C), 4 weeks of water storage (37◦C), and finally 26 weeks of water<br/>storage (37◦C). Silver nitrate nanoleakage analysis was used to assess the quality of<br/>zirconia/resin interface. A repeated measures ANOVA and Bonferroni post hoc test<br/>were used to analyze the data (n = 18, α = 0.05)<br/>Results: There were significant differences in theMTBS values between the three test<br/>groups at each of the test intervals (p &lt; 0.001). AA resulted in reduction in the bond<br/>strength of the as-sintered and the particle-abraded groups (5.9 MPa and 27.4, MPa,<br/>respectively). Reduction in the bond strength of these groups was explained by the<br/>observed nanoleakage across the zirconia/resin interface. The bond strength of the SIE<br/>specimens was stable after completion of AA (51.9 MPa), which also demonstrated a<br/>good seal against silver nitrate penetration across the zirconia/resin interface.<br/>Conclusion: SIE established a strong, stable, and durable bond to zirconia substrates.<br/>Conservative resin-bonded zirconia restorations are now possible using this new<br/>technique.<br/>The introduction of zirconia-based materials to the dental field<br/>broadened the design and application limits of all-ceramic<br/>restorations. As a result of the unique mechanical properties of<br/>zirconia framework materials, three- or four-unit-fixed partial<br/>dentures (FPDs) are no longer the safe limit for the construction<br/>of all-ceramic restorations. Combined with CAD/CAM<br/>technology, the fabrication of extensive zirconia restorations<br/>became a simple and an accurate procedure.1<br/>Chemical bonding is the basic fundamental for minimally<br/>invasive dentistry where the retention of the restoration mainly<br/>depends on adhesion to the tooth structure instead of retentive<br/>features made in the preparation.2 Additionally, it reduces<br/>microleakage, tooth sensitivity, and the possibility of recurrent<br/>decay.3 Patients have a preference for methods that can<br/>spare the reduction of their sound abutment teeth and would<br/>welcome

Topics

• impedance spectroscopy
• surface
• silver
• aluminum oxide
• aluminium
• strength
• composite
• cement
• etching
• aging
• resin
• aging
• collision-induced dissociation