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A 3D numerical simulation of stress distribution and fracture process in a zirconia-based FPD framework
Umeå universitet, Medicinska fakulteten, Institutionen för odontologi, Odontologisk materialvetenskap.
Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
Institute of Mechanics, Chinese Academy of Sciences, Beijing, China.
Vise andre og tillknytning
2011 (engelsk)Inngår i: Journal of Biomedical Materials Research. Part B - Applied biomaterials, ISSN 1552-4973, E-ISSN 1552-4981, Vol. 96B, nr 2, s. 376-385Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In this study, a numerical approach to the fracture behavior in a three-unit zirconia-based fixed partial denture (FPD) framework was made under mechanical loading using a newly developed three-dimensional (3D) numerical modeling code. All the materials studied were treated heterogeneously and Weibull distribution law was applied to describe the heterogeneity. The Mohr-Coulomb failure criterion with tensile strength cut-off was utilized to judge whether the material was in an elastic or failed state. For validation, the fracture pattern obtained from the numerical modeling was compared with a laboratory test; they largely correlated with each other. Similar fracture initiation sites were detected both in the numerical simulation and in an earlier fractographic analysis. The numerical simulation applied in this study clearly described the stress distribution and fracture process of zirconia-based FPD frameworks, information that could not be gained from the laboratory tests alone. Thus, the newly developed 3D numerical modeling code seems to be an efficient tool for prediction of the fracture process in ceramic FPD frameworks.

sted, utgiver, år, opplag, sider
John Wiley & Sons, 2011. Vol. 96B, nr 2, s. 376-385
Emneord [en]
ceramics, finite element analysis, fixed partial denture, fracture process, numerical simulation
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-38966DOI: 10.1002/jbm.b.31782ISI: 000286169600023Scopus ID: 2-s2.0-78651091304OAI: oai:DiVA.org:umu-38966DiVA, id: diva2:386055
Tilgjengelig fra: 2011-01-12 Laget: 2011-01-12 Sist oppdatert: 2023-03-23bibliografisk kontrollert
Inngår i avhandling
1. On dental ceramics and their fracture: a laboratory and numerical study
Åpne denne publikasjonen i ny fane eller vindu >>On dental ceramics and their fracture: a laboratory and numerical study
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Background Surface treatments and irregularities in the surfaces may affect the fracture of ceramics. The effects of various treatments on the surface texture of different types of ceramic cores/substructures was therefore qualitatively, quantitatively and numerically evaluated. Since fractures in ceramics are not fully understood, the fracture behavior in dental ceramic core/substructures was also studied using both established laboratory methods and newly developed numerical methods.

Methods The surfaces of dental ceramic cores/substructures were studied qualitatively by means of a fluorescence penetrant method and scanning electron microscopy, quantitatively evaluated using a profilometer and also numerical simulation. In order to study fracture in zirconia-based fixed partial denture (FPD) frameworks, fractographic analysis in combination with fracture tests and newly developed two-dimensional (2D) and three-dimensional (3D) numerical modeling methods were used. In the numerical modeling methods, the heterogeneity within the materials was described by means of the Weibull distribution law. The Mohr–Coulomb failure criterion with tensile strength cut-off was used to judge whether the material was in an elastic or failed state.

Results Manual grinding/polishing could smooth the surfaces on some of the types of dental ceramic cores/substructures studied. Using the fluorescence penetrant method, no cracks/flaws apart from milling grooves could be seen on the surfaces of machined zirconia-based frameworks. Numerical simulations demonstrated that surface grooves affect the fracture of the ceramic bars and the deeper the groove, the sooner the bar fractured. In the laboratory tests the fracture mechanism in the FPD frameworks was identified as tensile failure and irregularities on the ceramic surfaces could act as fracture initiation sites. The numerical modeling codes allowed a better understanding of the fracture mechanism than the laboratory tests; the stress distribution and the fracture process could be reproduced using the mathematical methods of mechanics. Furthermore, a strong correlation was found between the numerical and the laboratory results.

Conclusion Based on the findings in the current thesis, smooth surfaces in areas of concentrated tensile stress would be preferable regarding the survival of ceramic restorations, however, the surfaces of only some of the ceramic cores/substructures could be significantly affected by manual polishing. The newly developed 3D method clearly showed the stress distribution and the fracture process in ceramic FPD frameworks, step by step, and seems to be an appropriate tool for use in the prediction of the fracture process in ceramic FPD frameworks.

sted, utgiver, år, opplag, sider
Umeå: Umeå universitet, 2010. s. 53
Serie
Umeå University odontological dissertations, ISSN 0345-7532 ; 113
Emneord
Dental ceramics, Finite element analysis, Fixed partial denture, Fracture, Numerical modeling, Surface treatment
HSV kategori
Forskningsprogram
odontologi
Identifikatorer
urn:nbn:se:umu:diva-36590 (URN)978-91-7459-037-1 (ISBN)
Disputas
2010-10-29, Sal 260, byggnad 3A, Norrlands universitetssjukhus, Umeå, 13:00 (svensk)
Opponent
Veileder
Tilgjengelig fra: 2010-10-08 Laget: 2010-10-05 Sist oppdatert: 2018-06-08bibliografisk kontrollert

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