| Autor: |
Meijer, H. J. A., Starmans, F. J. M., Steen, W. H. A., Bosman, F. |
| Předmět: |
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| Zdroj: |
Journal of Oral Rehabilitation; Jan1994, Vol. 21 Issue 1, p47-56, 10p |
| Abstrakt: |
The location and the number of implants to support an overdenture is of major importance for the superstructure design. Sometimes, jaw hone anatomy or posteriorly placed implants enforce the use of an angular bar to achieve a position above the alveolar ridge. Loads on such a bar may introduce a moment on the implants which can result in high hone stresses and eventually the loss of the implants. This study on stress distribution in the bone around the implants in an edentulous mandible was performed using a three-dimensional finite clement model. One model with two implants placed just anteriorly of the mental foramen and connected with an anteriorly placed bar, following the curvature of the alveolar ridge, was compared with two other designs. First with a similar model hut now without a bar and secondly with a model with four implants connected with straight bars. It is concluded that loading a bar, which is placed anteriorly of the interconnecting line between two implants, causes extremely large compressive and tensile stress concentrations in the bone around the implants. Therefore, in those cases, it is advised not to connect the implants or, in case a bar-clip attachment is preferred, to place additional implants in the frontal region. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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