Mechanical properties of CoCr dental-prosthesis restorations made by three manufacturing processes: influence of the microstructure and topography
Autor/a
Padrós, Roberto
Rupérez de Gracia, Elisa
Gil Mur, Francisco Javier
Data de publicació
2020ISSN
2075-4701
Resum
The aim of this study is to compare the mechanical properties of three different dental restorations’ 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 µm for the samples produced by CADCAM to 85.76 ± 22.56 µm for the samples produced by the casting method. Laser sintering presents a marginal gap of 60.95 ± 20.66 µm. 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.
Tipus de document
Article
Versió del document
Versió acceptada
Llengua
English
Matèries (CDU)
616.3 - Patologia de l'aparell digestiu. Odontologia
Paraules clau
Odontologia
Implants dentals
Pròtesis dentals
Odontología
Implantes dentales
Prótesis dentales
Odontology
Dental implants
Dental prosthesis
Pàgines
18
Publicat per
MDPI
Col·lecció
10; 6
Publicat a
Metals
Citació
Padrós, Roberto; Punset, Miquel; Molmeneu, Meritxell [et al.]. Mechanical properties of CoCr dental-prosthesis restorations made by three manufacturing processes: influence of the microstructure and topography. Metals, 2020, 10(6), p. 1-18. Disponible en: <https://www.mdpi.com/2075-4701/10/6/788>. Fecha de acceso: 19 jun. 2020. DOI: 10.3390/met10060788
Número de l'acord de la subvenció
info:eu-repo/grantAgreement/MICINN/RTI2018-098075-B-C21
info:eu-repo/grantAgreement/MICINN/RTI2018-098075-B-C22
Aquest element apareix en la col·lecció o col·leccions següent(s)
- Odontologia [248]
Drets
© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open accessarticle distributed under the terms and conditions of the Creative Commons Attribution(CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Excepte que s'indiqui una altra cosa, la llicència de l'ítem es descriu com https://creativecommons.org/licenses/by/4.0/