BaTiO3 modified 3Y-TZP with self-lubricating property for dental application

Abstract

The present study aimed to evaluate the wear behavior of BaTiO3 (BT) modified 3Y-TZP ceramic composites compared to commercially available 3Y-TZP products and provided evidence relevant to its clinical use. A set of BT-modified 3Y-TZP (BT/3Y-TZP) ceramic composites was prepared. The mechanical properties and wear behavior of BT/3Y-TZP ceramic composites were investigated. The 3D digital microscopy, scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) analyses of the worn surface helped to reveal the underlining mechanisms. In comparison with commercially available 3Y-TZP ceramics, the mechanical properties of the BT/3Y-TZP composite ceramics could meet the clinical requirements. More importantly, the 5 mol% BT/3Y-TZP showed the best wear properties against natural tooth enamel for the dry and saliva lubrication tests. The SEM and STEM analyses confirmed a stable transfer enamel layer formed on the surface of 5 mol% BT/3Y-TZP ceramic composite under dry as well as saliva environments. The in site formed tribofilm with self-lubricating function contributed to the reduced wear of the antagonist teeth. Therefore, the enamel-friendly 5 mol% BT/3Y-TZP may be a new material option for restorative dentistry. Moreover, the interface transfer theory could provide a new way of thinking to find more enamel-friendly dental restorative materials in the future.