The influence of the root cross-section on the stress distribution in teeth restored with a positive-locking post and core design: a finite element study
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Kai-Uwe Schilling
Abstract
Human teeth with substantial coronal defects are subject to reconstruction by means of post and core restorations. Typically, such a restoration comprises a slightly cylindrical post onto which an abutment of varying shape, depending on the designated restoration, is attached. As clinical results are not satisfactory to date, we proposed a new proprietary post and core design which makes use of positive locking. As this prefabricated system is not customised to an individual root's cross-sectional geometry (usually oval), a varying amount of radicular dentin is left in periphery of the core's outer edge. The aim of this study was to assess the implications of this fact, i.e., whether the root has to endure higher overall stress levels which ultimately may lead to failure of one of the components involved. A series of finite element simulations were performed to evaluate stress and strain on the system, in which the proposed post and core was embedded into a virtual dentin cylinder of different diameters, ranging from flush mounting of the restoration to a dentin excess of 4 mm, and subsequently loaded with forces with two angles of attack (90° and 130°). The results show that flush mounting yields an agreeable stress and strain distribution within the radicular dentin, but overall stress levels drop significantly with an excess of 0.5 mm of surrounding dentin. More than 1 mm excess was not found to have profound positive effects.
©2008 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Guest editorial
- Biomechanics and biomaterials in oral rehabilitation and dental treatment
- Mini review
- Bone quality, quantity and metabolism in terms of dental implantation
- Research articles
- Finite element representation of bone substitute remodelling in the jaw bone
- The biomaterial influences the ossification after sinus floor elevation using tissue-engineered bone grafts
- O-phospho-l-serine: a modulator of bone healing in calcium-phosphate cements
- A new design for post and core restorations implementing positive locking
- Mechanical loading of orthodontic miniscrews – significance and problems: an experimental study
- Effect of load angulation and crown shape on forces acting on post and core restored teeth: an in vitro study
- Failure analysis of a new post-and-core restoration system using the finite element method
- The influence of the root cross-section on the stress distribution in teeth restored with a positive-locking post and core design: a finite element study
- Reproducibility of electronic tooth colour measurements
Articles in the same Issue
- Guest editorial
- Biomechanics and biomaterials in oral rehabilitation and dental treatment
- Mini review
- Bone quality, quantity and metabolism in terms of dental implantation
- Research articles
- Finite element representation of bone substitute remodelling in the jaw bone
- The biomaterial influences the ossification after sinus floor elevation using tissue-engineered bone grafts
- O-phospho-l-serine: a modulator of bone healing in calcium-phosphate cements
- A new design for post and core restorations implementing positive locking
- Mechanical loading of orthodontic miniscrews – significance and problems: an experimental study
- Effect of load angulation and crown shape on forces acting on post and core restored teeth: an in vitro study
- Failure analysis of a new post-and-core restoration system using the finite element method
- The influence of the root cross-section on the stress distribution in teeth restored with a positive-locking post and core design: a finite element study
- Reproducibility of electronic tooth colour measurements
