title: Comparison of Stress Distribution in a Maxillary Central Incisor Restored with Two Prefabricated Post Systems with and without Ferrule Using Finite Element Method.
abstract: BACKGROUND
  When restoring an endodontically treated tooth with deficient coronal tooth structure, posts can be used to strengthen the tooth. Recently prefabricated posts are widely used as they exclude the need for complex laboratory procedures making the procedure time saving. But the post-placement can produce stresses that cause root fracture. Different techniques can be used to study the stress distribution due to different posts, but most of them are two-dimensional and difficult to reproduce.
  
  
  OBJECTIVE
  The aim of the study was to compare the stress distribution in a maxillary central incisor with Titanium and Glass fiber posts with and without ferrule using the three dimensional finite element analysis.
  
  
  METHODS
  In this study 3D finite element analysis was used. Four models P1(Endodontically treated maxillary central incisor with a ferrule of coronal dentin and restored with parallel sided prefabricated titanium post and composite resin core), P2 (Endodontically treated maxillary central incisor restored with parallel sided prefabricated Titanium post and composite resin core without a ferrule of coronal dentin), P3 (Endodontically treated maxillary central incisor with a ferrule of coronal dentin and restored with parallel sided prefabricated glass fiber reinforced composite post and composite core), P4 (Endodontically treated maxillary central incisor restored with parallel sided prefabricated glass fiber reinforced composite post and composite core without a ferrule of coronal dentin), were modeled using PRO E software. Then stress analysis was done using ANSYS WORKBENCH 10.0software. A load of 100 N was applied to the models at 2mm from the incisal edge on the palatal surface with an angle of 45oto the long axis of the tooth.
  
  
  RESULTS
  The results suggested that maximum stresses were seen around posts in order of Titanium post without ferrule followed by Titanium post with ferrule next Glass fiber post without ferrule followed by Glass fiber post with ferrule.
  
  
  CONCLUSIONS
  Stress distribution in a maxillary central incisor restored with titanium post is greater than when restored with glass fiber post. Stress distribution around posts is greater when a ferrule is not present.
authors: Reader, Department of Prosthodontics, Rajas Dental College and Hospital , Thirurajapuram, Tamil Nadu, India .
authors: Aarti
authors: A
authors: Rajambigai
authors: Professor, Department of Prosthodontics, Noorul Islam College of Dental Science , Thiruvananthapuram, Kerela, India .
authors: Arun
authors: A
authors: Kumar
authors: Reader, Department of Prosthodontics, Rajas Dental College and Hospital , Thirurajapuram, Tamil Nadu, India .
authors: Sabarinathan
authors: Senior Lecturer, Department of Prosthodontics, Rajas Dental College and Hospital , Thirurajapuram, Tamil Nadu, India .
authors: Ramesh
authors: R
authors: Raja
keywords: Boundary condition; Glass fiber post; Meshing; Titanium post