Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging

Author(s)

da Silva, Allan Oliveira ; Fiorin, Livia ; Lapria Faria, Adriana Claudia ; Ribeiro, Ricardo Faria ; Silveira Rodrigues, Renata Cristina

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 12, n. 1, p. 9-pg., 2022-09-27.

Abstract

Partially stabilized zirconia (5Y-PSZ) has been widely used to manufacture indirect monolithic restorations, and the effect of finishing procedures on the optical and mechanical properties of these materials are still unclear. The purpose of this study was to evaluate the effect of staining, polishing and glazing on surface roughness, crystalline phase content, microhardness, fracture toughness, dynamic elastic modulus, three-point flexural strength, strain distribution, color ( increment E-00/ increment L/ increment a/ increment b), and translucency before and after artificial accelerated aging (water spray and ultraviolet) of 5Y-PSZ. Bar-shaped and rectangle-shaped specimens of the 5Y-PSZ were prepared and divided into six groups, according to finishing procedure: GC (control), GS (staining), GG (glazing), GSG (staining and glazing), GP (polishing), GSP (staining and polishing). There was a significant difference between groups for surface roughness (p < 0.05), dynamic elastic modulus (p = 0.007), microhardness (p = < 0.05), increment E-00 (p = 0.010), and increment a (p = 0.008). GC presented higher cubic phase content, and the stained groups (GS, GSG and GSP) presented higher monoclinic content. The different finishing procedures affected roughness, dynamic elastic modulus, microhardness, and color of 5Y-PSZ; polishing being the finish that provides minors changes to the 5Y- PSZ. Accelerated artificial aging caused color change, regardless of finishing procedure used. (AU)

• FAPESP's process: 19/18367-4 - Effect of extrinsic characterization, polishing and glazing on the optical and mechanical properties of Y-FSZ
• Grantee: Renata Cristina Silveira Rodrigues Ferracioli
• Support Opportunities: Regular Research Grants