Back to Search
Start Over
Influence of crown ferrule heights and dowel material selection on the mechanical behavior of root-filled teeth: a finite element analysis.
- Source :
-
Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2012 Jun; Vol. 21 (4), pp. 304-11. Date of Electronic Publication: 2012 Feb 28. - Publication Year :
- 2012
-
Abstract
- Purpose: This study used the 3D finite element (FE) method to evaluate the mechanical behavior of a maxillary central incisor with three types of dowels with variable heights of the remaining crown structure, namely 0, 1, and 2 mm.<br />Materials and Methods: Based on computed microtomography, nine models of a maxillary central incisor restored with complete ceramic crowns were obtained, with three ferrule heights (0, 1, and 2 mm) and three types of dowels (glass fiber = GFD; nickel-chromium = NiCr; gold alloy = Au), as follows: GFD0--restored with GFD with absence (0 mm) of ferrule; GFD1--similar, with 1 mm ferrule; GFD2--glass fiber with 2 mm ferrule; NiCr0--restored with NiCr alloy dowel with absence (0 mm) of ferrule; NiCr1--similar, with 1 mm ferrule; NiCr2--similar, with 2 mm ferrule; Au0--restored with Au alloy dowel with absence (0 mm) of ferrule; Au1--similar, with 1 mm ferrule; Au2--similar, with 2 mm ferrule. A 180 N distributed load was applied to the lingual aspect of the tooth, at 45° to the tooth long axis. The surface of the periodontal ligament was fixed in the three axes (x = y = z = 0). The maximum principal stress (σ(max)), minimum principal stress (σ(min)), equivalent von Mises (σ(vM)) stress, and shear stress (σ(shear)) were calculated for the remaining crown dentin, root dentin, and dowels using the FE software.<br />Results: The σ(max) (MPa) in the crown dentin were: GFD0 = 117; NiCr0 = 30; Au0 = 64; GFD1 = 113; NiCr1 = 102; Au1 = 84; GFD2 = 102; NiCr2 = 260; Au2 = 266. The σ(max) (MPa) in the root dentin were: GFD0 = 159; NiCr0 = 151; Au0 = 158; GFD1 = 92; NiCr1 = 60; Au1 = 67; GFD2 = 97; NiCr2 = 87; Au2 = 109.<br />Conclusion: The maximum stress was found for the NiCr dowel, followed by the Au dowel and GFD; teeth without ferrule are more susceptible to the occurrence of fractures in the apical root third.<br /> (© 2012 by the American College of Prosthodontists.)
- Subjects :
- Ceramics chemistry
Chromium Alloys chemistry
Composite Resins chemistry
Computer Simulation
Dental Enamel physiology
Dental Prosthesis Design
Dental Pulp Cavity physiology
Dental Stress Analysis
Dentin physiology
Elastic Modulus
Glass chemistry
Gold Alloys chemistry
Humans
Incisor
Materials Testing
Models, Biological
Periodontal Ligament physiology
Stress, Mechanical
Tooth Apex physiology
Tooth Crown physiology
Tooth Root physiology
Tooth, Nonvital physiopathology
Crowns
Dental Materials chemistry
Finite Element Analysis
Imaging, Three-Dimensional methods
Post and Core Technique instrumentation
Tooth Preparation, Prosthodontic classification
Subjects
Details
- Language :
- English
- ISSN :
- 1532-849X
- Volume :
- 21
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Journal of prosthodontics : official journal of the American College of Prosthodontists
- Publication Type :
- Academic Journal
- Accession number :
- 22372913
- Full Text :
- https://doi.org/10.1111/j.1532-849X.2011.00832.x