title: Characterization of Conventional and High-Translucency Y-TZP Dental Ceramics Submitted to Air Abrasion.
abstract: This study evaluated the effect of air-abrasion on t®m phase transformation, roughness, topography and the elemental composition of three Y-TZP (Yttria-stabilized tetragonal zirconia polycrystal) dental ceramics: two conventional (Lava Frame and IPS ZirCad) and one with high-translucency (Lava Plus). Plates obtained from sintered blocks of each ceramic were divided into four groups: AS (as-sintered); 30 (air-abrasion with 30 mm Si-coated Al2O3 particles); 50 (air-abrasion with 50 mm Al2O3 particles) and 150 (air-abrasion with 150 mm Al2O3 particles). After the treatments, the plates were submitted to X-ray diffractometry; 3-D profilometry and SEM/EDS. The AS surfaces were composed of Zr and t phases. All treatments produced t®m phase transformation in the ceramics. The diameter of air-abrasion particles influenced the roughness (150>50>30>AS) and the topography. SEM analysis showed that the three treatments produced groove-shaped microretentions on the ceramic surfaces, which increased with the diameter of air-abrasion particles. EDS showed a decrease in Zr content along with the emergence of O and Al elements after air-abrasion. Presence of Si was also detected on the plates air-abraded with 30 mm Si-coated Al2O3 particles. It was concluded that irrespective of the type and diameter of the particles, air-abrasion produced t®m phase transformation, increased the roughness and changed the elemental composition of the three Y-TZP dental ceramics. Lava Plus also behaved similarly to the conventional Y-TZP ceramics, indicating that this high translucency ceramic could be more suitable to build monolithic ceramic restorations in the aesthetic restorative dentistry field.
authors.affiliation: Analytical Laboratory of Restorative Biomaterials - LABiom-R, Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Bhenya Ottoni
authors.initials: BO
authors.lastname: Tostes
authors.affiliation: Physics Institute, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Renato Bastos
authors.initials: RB
authors.lastname: Guimarães
authors.affiliation: Analytical Laboratory of Restorative Biomaterials - LABiom-R, Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Jaime Dutra
authors.initials: JD
authors.lastname: Noronha-Filho
authors.affiliation: Analytical Laboratory of Restorative Biomaterials - LABiom-R, Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Glauco Dos Santos
authors.initials: GD
authors.lastname: Botelho
authors.affiliation: Analytical Laboratory of Restorative Biomaterials - LABiom-R, Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: José Guilherme Antunes
authors.initials: JG
authors.lastname: Guimarães
authors.affiliation: Analytical Laboratory of Restorative Biomaterials - LABiom-R, Dental School, UFF - Universidade Federal Fluminense, Niterói, RJ, Brazil.
authors.forename: Eduardo Moreira da
authors.initials: EM
authors.lastname: Silva
mesh_terms: D000388:Air; D002516:Ceramics; D003764:Dental Materials; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D013052:Spectrometry, X-Ray Emission; D014961:X-Ray Diffraction
chemical_list: D003764:Dental Materials