INFLUENCE OF THE PRESENCE AND TYPE OF INTRARADICULAR POSTS ON THE BIOMECHANIC BEHAVIOR OF ENDODONTICALLY TREATED PREMOLARS WITH OR WITHOUT FERRULE

Abstract

The use of intraradicular post to restore endodontically treated teeth has been widely discussed. Therefore, the objective of this study was to evaluate the stress distribution in endodontically treated premolars restored with ceramic crowns under the influence or not of the ferrule and the presence or not of intraradicular posts. Six virtual models of endodontically treated lower premolars were constructed in three-dimensional modeling software (SolidWorks). The presented roots were constructed with (2mm) or without a ferrule and with or without an intraradicular post (cast metallic core, fiberglass post, or without a post). A ceramic crown was made over the root of the tooth. The models were considered isotropic, homogeneous, and linear and were evaluated using the finite element analysis software Ansys Workbench. A load of 250 N was applied to the buccal cusp at 45° to the long axis of the tooth. Maximum principal stress (σmax) data were obtained for the root and ceramic crown. The presence of the ferrule reduced the stresses generated in the root and the ceramic crown. The models restored with a cast metal core showed the highest stress values at the root (68.5N), followed by the groups with fiber post and without post (62N and 59N, respectively). The models that did not have posts had the highest stress values in the crown (87N). The ferrule reduces stresses on the root of premolars treated with or without intraradicular posts. Metal posts increase root stresses, while the absence of posts increases crown stresses. Keywords: Endodontic treatment, three-dimensional finite elements, ceramic crowns.