Biomechanical behaviour of a fractured maxillary incisor restored with direct composite resin only or with different post systems

Abstract

None of the restorations evaluated was able to recover the stress distribution of the sound tooth. The models restored with composite resin associated with a glass or carbon fibre post had similar stress distributions to that of the model restored with CR. The different post materials were shown to have a substantial influence on stress distribution, with less stress concentration when fibre posts were used.

Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength

“…The role of a post in the retention of the core material is particularly relevant for posterior teeth where masticatory loads are essentially compressive. On the other hand, as upper incisors are loaded transversally, the influence of post length on the tooth's flexural behavior is an important issue to be considered in order to reduce tooth fracture [8].…”

“…Subsequently, fiber-reinforced post systems were introduced [4,5]. At present, restoration of posterior ETT with a direct composite without placing any post has been proposed by several authors [6][7][8]. Moreover, a recent study might show that in largely compromised premolars, no significant differences existed between teeth restored with and without posts [6].…”

Biomechanical Models of Endodontic Restorations

“…The use of convergence tests is the most commonly reported method for deciding mesh density in the majority of previous works (Ferrari et al, 2008;Maceri et al, 2009;Schmitter et al, 2010). Some authors report special attention to the convergence of results near the more stressed area, such as the post-cement interface and the cemento-enamel junction (Garbin et al, 2010;Zarone et al, 2006). However, no explicit mention is made of the parameter used to test the convergence in most of the works.…”

“…Three-dimensional models have been used extensively for simulating endodontic treatment since the beginning of the century Ausiello et al, 2002;BarjauEscribano et al, 2006;Boschian Pest et al, 2006;Genovese et al, 2005;Lanza et al, 2005). In recent years some of the most complete three-dimensional models ever developed for studying the biomechanics of endodontic restorations have been reported (Ferrari et al, 2008;Garbin et al, 2010;Gonzalez-Lluch et al, 2009b;Maceri et al, 2009;Mezzomo et al, 2011;Okamoto et al, 2008;Schmitter et al, 2010). In these three-dimensional models, tetrahedral or hexahedral finite elements are used.…”

“…In these three-dimensional models, tetrahedral or hexahedral finite elements are used. The mesh is created normally using the mesher of a commercial finite element package software, such as Ansys (Garbin et al, 2010;Hsu et al, 2009;Mezzomo et al, 2011), MSC-Nastran (Gonzalez-Lluch et al, 2009bMaceri et al, 2009;Rodríguez-Cervantes et al, 2007), MSC-Marc Pegoretti et al, 2002) or Cosmos (Ichim et al, 2006). In those cases, a tetrahedral mesh is the typical option because of the complicated geometries of the tooth.…”