Three dimensional finite element analysis of a mandibular premolar restored with a fiber post and resin composite with different cavity designs
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Abstract
The stress distribution and fatigue lifetime of an endodontically treated mandibular premolar with various cavity designs for access, restored using a resin composite with and without a fiber post was investigated. A 3D model of a mandibular premolar with one root canal was selected. Eleven study models of tooth structure, including enamel, dentine and pulp tissue, were generated with different cavity designs, i.e., Class I, Class II OM, Class II MOD, Class V, Class V pulp exposure, cortical and cancellous bone, root canal configuration, as well as fiber post. A load of 150 N was applied to the lingual incline plane of the buccal cusp at an angle of 45 degrees to the long axis of the tooth. The results showed that the stress distributions in all models were similar, i.e., the maximum von Mises stresses were observed at the level of the cement-enamel junction (CEJ), and the stress decreased abruptly from the outer to the inner part of the tooth. The maximum von Mises stress along the tooth axis was concentrated at the load-bearing areas, and decreased gradually from the coronal region to the apex of the root. The fatigue lifetimes of the models restored with a fiber post were greater than those without a fiber post.
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