AI Article Synopsis
- The study identified that adding niobium (Nb) to zirconia improves fracture toughness but negatively affects thermal expansion and translucency.
- Researchers treated 3Y-TZP and 4.2Y-PSZ surfaces with NbO nanoparticles, creating a high-Nb-content layer that increased fracture toughness without altering other properties.
- The results suggest that this surface treatment method could enhance the durability of zirconia dental prostheses, leading to better and more reliable restorations.
Article Abstract
Background: Our previous study found that the addition of pentavalent cations like niobium (Nb) to yttria-stabilized zirconia increased fracture toughness but also raised the coefficient of thermal expansion (CTE), and opacity also increased undesirably. A new surface treatment is required to boost fracture toughness without altering CTE or translucency.
Methods: The surfaces of pre-sintered 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) and 4.2 mol% yttria-stabilized partially stabilized zirconia (4.2Y-PSZ) were treated with a Nb sol solution containing NbO nanoparticles. After drying and sintering, a high-Nb-content surface layer formed with a depth of approximately 1 mm.
Results: The Nb content in this surface layer matched that of a bulk material with 1 mol% NbO. The tetragonality of the surface zirconia increased, enhancing the surface fracture toughness without changing the CTE or translucency.
Conclusions: Adding Nb near the surface improved the fracture toughness without affecting the CTE or translucency. This method could strengthen zirconia prostheses, allowing more reliable dental restorations.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11433186 | PMC |
| http://dx.doi.org/10.3390/ma17184446 | DOI Listing |
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