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Lu, Yuqing
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Publications (5/5 displayed)
- 2024Effect of Surface Treatment and Resin Cement on the Bond Strength of an Advanced Lithium Disilicatecitations
- 2024Effect of printing layer orientation and polishing on the fatigue strength of 3D-printed dental zirconiacitations
- 2024Effect of printing layer orientation and polishing on the fatigue strength of 3D-printed dental zirconiacitations
- 2023Does glaze firing affect the strength of advanced lithium disilicate after simulated defects?citations
- 2023Does glaze firing affect the strength of advanced lithium disilicate after simulated defects?citations
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article
Effect of printing layer orientation and polishing on the fatigue strength of 3D-printed dental zirconia
Abstract
<p>Objective: The aim of the study was to evaluate the influence of surface polishing and printing layer orientation on the fatigue behaviour of 3 mol% yttria-stabilized zirconia (3Y-TZP) by stereolithography (SLA) in comparison with subtractive manufacturing. Materials and methods: 60 experimental zirconia bar-shaped specimens were 3D-printed (P) via SLA, and 30 specimens were milled (M) from commercial zirconia block (Lava™ Frame, 3 M ESPE AG). All specimens had the same dimensions (1 mm × 1 mm x 12 mm) after sintering. The 3D-printed specimens were randomly divided according to printing orientations: parallel or perpendicular to the tensile surface in the fatigue test. The specimens were subsequently submitted to two surface finishing protocols (n = 15/gr): unpolished or polished. Their phase compositions were analysed by X-ray diffraction. The fatigue behaviour was evaluated by a stepwise approach. Results: The milled and both 3D-printed groups showed similar phase compositions for the as-sintered condition. Considerable amounts of rhombohedral phase were detected after polishing. Milled unpolished samples presented significantly higher fatigue strength than 3D-printed unpolished samples. Polishing did not improve the fatigue strength for milled zirconia but was advantageous for the 3D-printed specimens. 3D-printed specimens with parallel printing-layer orientation were significantly stronger than specimens with perpendicular layers regardless of surface finishing. Conclusion: The manufacturing techniques had a significant influence on the fatigue strength of 3Y-TZP, but not on the phase compositions of the surface. The polishing protocol showed different effects on 3Y-TZP fatigue strength and induced phase transition of the 3Y-TZP from Tetragonal to Rhombohedral. The best fatigue strength was achieved through milling using an unpolished surface and SLA-printed layers that were parallel to the tensile surface, followed by polishing.</p>