Schilling, Kai-Uwe and Rottner, Kurt and Boldt, Julian and Proff, Peter and Gredes, Tomasz and Richter, Ernst-Juergen and Reicheneder, Claudia (2008) 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. BIOMEDIZINISCHE TECHNIK, 53 (5). pp. 255-258. ISSN 0013-5585,
Full text not available from this repository. (Request a copy)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 degrees and 130 degrees). 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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; finite element method; positive locking; post and core restoration; radicular dentin; tooth |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Kieferorthopädie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 Nov 2020 09:24 |
| Last Modified: | 11 Nov 2020 09:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31560 |
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