Mechanical properties of aged yttria-stabilized tetragonal zirconia polycrystal after abrasion with different aluminum oxide particles

• Published in: The Journal of prosthetic dentistry 2020-11, Vol.124 (5), p.599-604
• Main Authors: Barreto, Suelem C., Lima, Renally B.W., Aguiar, Flávio Henrique B., Santos, Carlos Tadeu D., Paulillo, Luís Alexandre M.S., de Souza, Grace M.D.
• Format: Article
• Language: English
• Subjects: Dentistry
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/j.prosdent.2019.10.027

A consensus on the benefits of airborne-particle abrasion of zirconia with alumina particles of different sizes is still lacking. Larger particle size may improve micromechanical retention but may generate deep microcracks on the zirconia surface. The purpose of this in vitro study was to evaluate the effect of different size of Al2O3 particles used for surface abrasion on the mechanical properties of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). Sixty Y-TZP specimens were divided into 6 groups according to the treatment: control (without treatment) or airborne-particle abrasion with Al2O3 particles (45 μm or 150 μm). Half the specimens were stored for 24 hours in water while the other half was exposed to 1.5×106 mechanical cycles before flexural strength analysis at 1 mm/min crosshead speed. Specimens were also characterized by micro-Raman spectroscopy and X-ray diffraction (XRD) to evaluate the crystalline composition. The data were subjected to 2-way ANOVA and Tukey HSD test (α=.05). Airborne-particle abrasion with alumina (P=.030) and mechanical fatigue (P