title: Comparison of fracture resistance of endodontically treated teeth using different coronal restorative materials: An in vitro study.
abstract: OBJECTIVE
  To evaluate the in vitro effect of bonded restorations on the fracture resistance of root canal-treated teeth.
  
  
  METHODS
  One hundred twenty extracted, maxillary, permanent premolars were collected. After preparing the access cavity, the teeth were biomechanically prepared and obturated. Samples were divided into six groups based on the type of restorative material used to restore them. Teeth were embedded in acrylic resin and their fracture strength was measured using a Universal Testing Machine. Data were evaluated statistically using one-way ANOVA-F and unpaired t-test.
  
  
  RESULTS
  Teeth restored with bonded amalgam and composite resin showed higher fracture resistance than those restored with conventional amalgam. Fracture strengths of bonded restorations and intact teeth were not statistically different. The results suggested that the group restored with conventional amalgam had the lowest fracture resistance. No statistically significant differences were found between the bonded amalgam and composite resin groups.
  
  
  CONCLUSIONS
  Conventional amalgam core showed the least fracture resistance whereas; composite resin and bonded amalgam core showed fracture resistance was similar to that of natural tooth.
authors.affiliation: Departments of Conservative Dentistry and Endodontics, D.J. College of Dental Sciences and Research, Modinagar, U.P, India.
authors.forename: Prashant
authors.initials: P
authors.lastname: Monga
authors.forename: Vivek
authors.initials: V
authors.lastname: Sharma
authors.forename: Sukesh
authors.initials: S
authors.lastname: Kumar