Abstract
In this study, the biaxial flexural strength (BFS) and fractography of high/ultra-translucent monolithic zirconia ceramics subjected to different mechanical surface pretreatments were evaluated. A total of 108 disc-shaped samples (12 mm diameter, 1.2 mm thickness) of three zirconia materials (5Y-ZP KATANA Zirconia UTML (ML), 3Y-TZP DD Bio ZX2 (DB), and 5Y-ZP DD cube X2 (DC)) were used. The BFS was investigated after subjecting the samples to surface treatment using air abrasion particles of two types (aluminum oxide or glass microbeads). The data were analyzed using two-way analysis of variance, followed by Scheffe’s post hoc test for multiple comparisons. The mean ± standard deviation BFS for DB was highest after treatment with 50 µm Al2O3 (1626.05 ± 31.9 MPa), with lower values being observed following treatment with 50 µm glass microbeads (1399.53 ± 24.2 MPa) and in the control sample (1198.51 ± 21.1 MPa). The mean ± standard deviation (SD) BFSs for DC and ML were the highest in the control groups. Surface air abrasion with 50 µm Al2O3 particles and 2 bar pressure is recommended for 3Y-TZP translucent zirconia, while no abrasion of 5Y-ZP translucent zirconia ceramic.
Highlights
All-ceramic-based dental restorations are of particular importance due to their superior biocompatibility and aesthetics compared to porcelain fused to metal restorations [1]
The aim of this study is to evaluate the biaxial flexural strength (BFS) values and carry out a qualitative fractographic analysis of high-translucent and ultra-translucent monolithic zirconia ceramics subjected to different mechanical surface treatment protocols
Previous studies have demonstrated that sandblasting with aluminum oxide particles at 0.2 MPa improved the BFSs of both conventional and high-translucent 3 mol% yttria-stabilized tetragonal zirconia polycrystalline (3Y-TZP) zirconia ceramics [34,35,36]
Summary
All-ceramic-based dental restorations are of particular importance due to their superior biocompatibility and aesthetics compared to porcelain fused to metal restorations [1]. The strength and fracture toughness of this generation of materials were higher than those of newer generations, they exhibited a high opacity due to the presence of tetragonal zirconia phases, which resulted in light scattering from the grain boundaries, additive inclusions, and pores [4]. This type of zirconia is recommended for the fabrication of framework materials in fixed partial dentures and porcelain-layered crowns. The second generation of 3Y-TZP materials showed an improved translucency, their aesthetics were insufficient for use as monolithic ceramic restorations in the anterior aesthetic zone [4]
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