The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study
Dental crown structures were modelled using a curved bi-layer system consisting of a brittle glass coating on a compliant polymeric substrate, to illustrate the role of skirt geometry on the mechanics of failure evolution. The geometries of the samples were varied by tapering the skirts of the glass...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Ltd
2008
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/43538 |
| _version_ | 1848756724194869248 |
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| author | Whitton, A. Qasim, T. Ford, Christopher Hu, X. Bush, M. |
| author_facet | Whitton, A. Qasim, T. Ford, Christopher Hu, X. Bush, M. |
| author_sort | Whitton, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Dental crown structures were modelled using a curved bi-layer system consisting of a brittle glass coating on a compliant polymeric substrate, to illustrate the role of skirt geometry on the mechanics of failure evolution. The geometries of the samples were varied by tapering the skirts of the glass shells in different lengths and thicknesses. The failure of these samples was investigated under single-cycle axial loading tests using an indenter of low elastic modulus. The onset of fracture was observed in situ using a video camera. A relationship between the height and thickness of the taper and the critical load required for a crack to appear in the sample was observed. Margin cracks were observed to propagate from flaws near the margins. Experimental trends suggested that critical loads increased with increasing taper thickness, and decreased with increasing taper length. Finite element modelling was also used to evaluate the stress distribution in the glass coating. Peak maximum principal stresses at the margins decreased with increasing taper thickness, and increased with increasing taper length, consistent with the experimentally determined critical loads. It is concluded that long, narrow tapers should be avoided in order to maximise the load bearing capacity of dental crowns. |
| first_indexed | 2025-11-14T09:16:45Z |
| format | Journal Article |
| id | curtin-20.500.11937-43538 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:16:45Z |
| publishDate | 2008 |
| publisher | Elsevier Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-435382017-09-13T14:01:55Z The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study Whitton, A. Qasim, T. Ford, Christopher Hu, X. Bush, M. Finite element modelling Radial cracks Skirt length Brittle coatings Dental crown structures were modelled using a curved bi-layer system consisting of a brittle glass coating on a compliant polymeric substrate, to illustrate the role of skirt geometry on the mechanics of failure evolution. The geometries of the samples were varied by tapering the skirts of the glass shells in different lengths and thicknesses. The failure of these samples was investigated under single-cycle axial loading tests using an indenter of low elastic modulus. The onset of fracture was observed in situ using a video camera. A relationship between the height and thickness of the taper and the critical load required for a crack to appear in the sample was observed. Margin cracks were observed to propagate from flaws near the margins. Experimental trends suggested that critical loads increased with increasing taper thickness, and decreased with increasing taper length. Finite element modelling was also used to evaluate the stress distribution in the glass coating. Peak maximum principal stresses at the margins decreased with increasing taper thickness, and increased with increasing taper length, consistent with the experimentally determined critical loads. It is concluded that long, narrow tapers should be avoided in order to maximise the load bearing capacity of dental crowns. 2008 Journal Article http://hdl.handle.net/20.500.11937/43538 10.1016/j.medengphy.2007.07.006 Elsevier Ltd restricted |
| spellingShingle | Finite element modelling Radial cracks Skirt length Brittle coatings Whitton, A. Qasim, T. Ford, Christopher Hu, X. Bush, M. The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title | The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title_full | The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title_fullStr | The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title_full_unstemmed | The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title_short | The role of skirt geometry of dental crowns on the mechanics of failure: Experimental and numerical study |
| title_sort | role of skirt geometry of dental crowns on the mechanics of failure: experimental and numerical study |
| topic | Finite element modelling Radial cracks Skirt length Brittle coatings |
| url | http://hdl.handle.net/20.500.11937/43538 |