Mechanical properties of CoCr dental-prosthesis restorations made by three manufacturing processes. Influence of the microstructure and topography
| Autor: | Miquel Punset, Francisco Javier Gil, Roberto Padrós, Elisa Rupérez, Aritza Brizuela Velasco, Meritxell Molmeneu, Mariano Herrero-Climent |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. BBT - Biomaterials, Biomecànica i Enginyeria de Teixits, Barcelona Dental Institute, Universidad de Oviedo, Universitat Internacional de Catalunya |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Microscope Dental prosthesis Scanning electron microscope Laser sintering Mechanical properties 02 engineering and technology mechanical properties law.invention 0302 clinical medicine law General Materials Science dental restorations Composite material CADCAM milling roughness Implantes dentales Metals and Alloys Pròtesis dentals 021001 nanoscience & nanotechnology Microstructure casting Prótesis dentales Odontology 0210 nano-technology additive manufacturing Materials science Additive manufacturing laser sintering Marginal fit Odontología 616.3 flexural load to fracture Enginyeria dels materials [Àrees temàtiques de la UPC] Odontologia Indentation hardness Dental restorations 03 medical and health sciences stomatognathic system Flexural strength Hardness Flexural load to fracture Casting lcsh:Mining engineering. Metallurgy Implants dentals Dental implants 030206 dentistry Roughness hardness stomatognathic diseases Selective laser sintering Casting (metalworking) marginal fit Cr-Co alloy |
| Zdroj: | Scopus RUO. Repositorio Institucional de la Universidad de Oviedo instname Metals, Vol 10, Iss 788, p 788 (2020) UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) RUO: Repositorio Institucional de la Universidad de Oviedo Universidad de Oviedo (UNIOVI) Metals Volume 10 Issue 6 |
| Popis: | The aim of this study is to compare the mechanical properties of three different dental restorations&rsquo manufacturing processes (CADCAM milling, casting and laser sintering) generated by only one laboratory scanner focusing on marginal fit analysis and their mechanical properties. A chrome-cobalt (Cr-Co) alloy from the same batch was used for three different methods to make an implant abutment. This simulates a maxillary right first molar that was fixed in a hemi-maxillary stone model. Five scans were performed by each tested framework. Nine frameworks were manufactured for each manufacture procedure. Field-Emission Scanning Electron Microscope (FE-SEM) direct vision was used to marginal gap measurement in five critical points for each specimen. In order to fix the samples in the microscope chamber, the restorations were submitted at a compression load of 50 N. The samples always have the same orientation and conditions. The resolution of the microscope is 4 nm and it is equipped by J image software. The microstructure of the samples was also determined with the FE-SEM equipped with EDS-microanalysis. Roughness parameters were measured using White Light Interferometry (WLI). The arithmetical mean for the Ra and Rq of each sample was calculated. The samples were mechanically characterized by means of microhardness and flexural testing. Servo-hydraulic testing machine was used with cross-head rate of 1 mm/min. Two-way ANOVA statistical analysis was performed to determine whether the marginal discrepancies and mechanical properties were significantly different between each group (significance level p < 0.05). The overall mean marginal gap values were: from 50.53 ± 10.30 µ m for the samples produced by CADCAM to 85.76 ± 22.56 µ m for the samples produced by the casting method. Laser sintering presents a marginal gap of 60.95 ± 20.66 µ m. The results revealed a statistically significant difference (p-value < 0.005) in the mean marginal gap between the CADCAM systems studied. The higher flexure load to fracture for these restorations were for CADCAM restoration and the lower was for the casting samples. For these restorations, CADCAM Restoration yielded a higher flexure load to fracture and Casting ones yielded the lower. Porosity and microstructure play a very important role in the mechanical properties. |
| Databáze: | OpenAIRE |
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