title: Fracture resistance of tooth restored with four glass fiber post systems of varying surface geometries-An in vitro study.
abstract: BACKGROUND
  The purpose of this study was to relate the fracture resistance of endodontically treated teeth in relation to post geometry.
  
  
  METHODS
  Forty single rooted mandibular premolars were instrumented by step - back technique and obturated by lateral condensation. Forty teeth were randomly divided into four groups: Reforpost glass fiber X-ray®, RelyX®, Exacto conical® and Parapost Fiber Lux®. The post spaces were prepared using respective drills and luted. The core build up was done and metal crowns were luted. Fracture resistance was determined in universal testing machine. The statistical analysis was done using one way ANOVA and post hoc Tukey Kramer test.
  
  
  RESULTS
  The teeth restored with Reforpost showed highest fracture resistance followed by Parapost and Exacto conical. The teeth restored with RelyX showed least fracture resistance. The teeth restored with Parapost had less unfavourable fracture followed by exacto conical.
  
  
  CONCLUSIONS
  Parallel design had less number of catastrophic failure and had better fracture resistance.
  
  
  BACKGROUND
  Fracture resistance, glass fiber post, post geometry, stress.
authors: MDS, Reader, Department of Conservative Dentistry and Endodontics, Adhiparasakthi Dental College and Hospital, Melmaruvathur, Tamilnadu, India.
authors: Adhikesavan
authors: A
authors: Jayasenthil
authors: MDS, Professor, Department of Conservative Dentistry and Endodontics, Rajah Muthiah Dental College and Hospital, Chidambaram.
authors: Emmanuel
authors: E
authors: Solomon-Sathish
authors: MDS, Reader, Department of Oral Medicine and Radiology, Ragas Dental College and Hospital, Chennai.
authors: Potluri
authors: P
authors: Venkatalakshmi-Aparna
authors: MDS, Professor and Head, Department of Conservative Dentistry and Endodontics, Tagore Dental College and Hospital, Chennai.
authors: Sunderasan
authors: S
authors: Balagopal