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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Denti, Lucia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2020Technological feasibility of lattice materials by L-PBF of A357.0citations
- 2019Effect of Three Different Finishing Processes on the Surface Morphology and Fatigue Life of A357.0 Parts Produced by Laser‐Based Powder Bed Fusioncitations
- 2018Assay of secondary anisotropy in additively manufactured alloys for dental applicationscitations
- 2018Fatigue behavior of as-built L-PBF A357.0 partscitations
- 2018Evaluation of Laser-Sintered CR-CO and TI Alloys for Dental Applications
- 2018Directed energy deposition of steel 316L: Effects of build orientation
- 2018Additive manufactured A357.0 samples using the laser powder bed fusion technique: Shear and tensile performancecitations
- 2017Effects of build orientation and element partitioning on microstructure and mechanical properties of biomedical Ti-6Al-4V alloy produced by laser sinteringcitations
- 2017Evaluation of Performance of Cast and Laser-Sintered cr-co Alloys for Dental Applications
- 2017Comparative study of three yttria-stabilized zirconia formulations in colored vs natural shades
- 2016Effects of thermal treatments on microstructure and mechanical properties of a Co-Cr-Mo-W biomedical alloy produced by laser sinteringcitations
- 2015Structural characterization of biomedical Co-Cr-Mo components produced by direct metal laser sinteringcitations
- 2014On the Effect of Electrodischarge Drilling on the Fatigue Life of Inconel 718citations
- 2013Investigation into the failure of Inconel exhaust collector produced by laser consolidationcitations
- 2013Studies on electrodischarge drilling of an Al2O3-TiC compositecitations
- 2013Studies on electro discharge drilling of an Al2O3 –TiC compositecitations
- 2010Microwave rapid debinding and sintering of MIM/CIM partscitations
- 2010DMLS DENTAL ALLOYS VS TRADITIONAL TECHNIQUE
- 2009CAST VERSUS LASER-SINTERED CR-CO ALLOYS: STUDY ON MECHANICAL CHARACTERISTICS
- 2009Comparative Mechanical Evaluation Of Three Y-TZP Formulations In Five Shades
- 2008Microwave assisted sintering of green metal partscitations
- 2007Pre-Sintered MIM Brown Parts Obtained by Microwave-Assisted Binder Remova
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article
Comparative Mechanical Evaluation Of Three Y-TZP Formulations In Five Shades
Abstract
Objectives: As integral structures in Y-TZP spread in dental practice, verifying the mechanical characteristics reported in literature and if they are affected by coloration becomes imperative. This study aims at determining flexural strength and hardness of three Y-TZP types in five different colours. Methods: Three commercial formulations of Y-TZP (A, B, C) were considered: as-received natural white and 4 different shades. Specimens were ASTM C1161, five for each typology (75 parts in 15 groups). Blocks of pre-sintered material were CAD/CAM dry machined, then some were coloured by dipping, before the last step of sintering (Tmax=1450°C). Three point flexural tests were performed to obtain flexural strength (S). After polishing Vickers hardness (HV1) was measured (ISO 14705). T-test for independent samples was carried out on the data, to evaluate the presence of significant differences (positive t-test) between the groups. Results: Mean S was between 500 and 800MPa, much lower than declared by the producers (1200 MPa). For B and C S tends to decrease with colour, but not significantly. For A S increases with colour and two cases present positive t-tests compared to natural white. There aren't significant differences between white specimens of the three companies. As to other shades, the t-test is positive between B and C for three colours over four and between A and B for one colour. HV1 results between 15.8 and 17GPa (in technical specifications HV=12.2 GPa). Colours significantly influence hardness, shifting towards higher values, for nearly all the studied comparisons. Conclusion: Material properties resulted greatly different from technical specifications. Flexural strength values suggest a careful design of frameworks connectors, especially in posterior prostheses. The studied materials resulted harder than expected, in particular when coloured. Colour proved to affect the performances in many cases, requiring esthetical and mechanical requirements to be merged