Effect of airborne-particle abrasion and polishing on novel translucent zirconias: Surface morphology, phase transformation and insights into bonding

Purpose: The purpose this study was to investigate the effect of Kern´s air-borne particle abrasion protocol (KAPA) and polishing on two translucent zirconias (4Y, 5Y-zirconias) compared a traditional zirconia (3Y-zirconia). Methods: Two different surface treatments were analysed by X-ray diffraction (XRD) interferometry 1) KAPA (0.1 MPa, 50 ?m alumina, 10-12 mm distance, 15 sec 30 cleaning in ultrasound using isopropyl alcohol 99%) 2) Clinical-delivery paste (Zircon Brite, Dental Ventures, USA). Shear-bond strength tests (SBS’s) performed with highly polished virtually flat combination 10-MDP based cement modified zinc phosphate cement. SBS expressed terms MPa. Results: mean values for monoclinic content 13 wt%, 7 wt% 2 3Y-, 4Y- 5Y-zirconias respectively, no differences found between seconds. Polishing did not result phase transformation any zirconias. rhombohedral identified all types regardless treatment. showed 5 MPa polished/10-MDP 3 KAPA/ Zinc phosphate. Statistically significant but Conclusions: seems be equal regarding morphology transformation. Sole micro-retention appears fully responsible bonding phenomena that underwent KAPA.