title: Fracture resistance of endodontically treated teeth restored with short fiber composite used as a core material-An in vitro study.
abstract: OBJECTIVE
  This in-vitro study tested the fracture resistance of endodontically treated molars with Mesial-Occluso-Distal (MOD) cavities restored with fibre reinforced composite material everX posterior in comparision with hybrid composite and ribbond fiber composite.
  
  
  METHODS
  Fifty intact freshly extracted human mandibular first molars were collected and were randomly divided into five groups (n=10). Group 1: positive control (PC) intact teeth without any endodontic preparation. In groups 2 through 6 after endodontic procedure standard MOD cavities were prepared and restored with their respective core materials as follows: group 2, negative control (NC) left unrestored or temporary flling was applied. Group 3, Hybrid composite (HC) as a core material (Te-Econom Plus Ivoclar Vivadent Asia) group 4, Ribbond (Ribbond; Seattle, WA, USA)+conventional composite resin (RCR) group 5, everX posterior (everX Posterior GC EUROPE)+conventional composite resin (EXP) after thermocycling fracture resistance for the samples were tested using universal testing machine. The results were analysed using ANOVA and Tukey's HSD post hoc tests.
  
  
  RESULTS
  Mean fracture resistance (in Newton, N) was group 1: 1568.4±221.71N, group 2: 891.0±50.107N, group 3: 1418.3±168.71N, group 4:1716.7±199.51N and group 5: 1994.8±254.195N.
  
  
  CONCLUSIONS
  Among the materials tested, endodontically treated teeth restored with everX posterior fiber reinforced composite showed superior fracture resistance.
authors.affiliation: Meenakshi Ammal Dental College & Hospital, Department of Conservative Dentistry and Endodontics, Maduravoyal, Chennai, 600095, India. Electronic address: tejjo89@gmail.com.
authors.forename: Tejesh Gupta
authors.initials: TG
authors.lastname: Garlapati
authors.affiliation: Meenakshi Ammal Dental College & Hospital, Department of Conservative Dentistry and Endodontics, Maduravoyal, Chennai, 600095, India. Electronic address: drkrithikadatta@hotmail.com.
authors.forename: Jogikalmat
authors.initials: J
authors.lastname: Krithikadatta
authors.affiliation: Meenakshi Ammal Dental College & Hospital, Department of Conservative Dentistry and Endodontics, Maduravoyal, Chennai, 600095, India. Electronic address: vel9911@yahoo.com.
authors.forename: Velmurugan
authors.initials: V
authors.lastname: Natanasabapathy
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D011140:Polyurethanes; D011176:Post and Core Technique; D014082:Tooth Fractures / Q000517:prevention & control
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes
keywords: Core material; Fracture resistance; Reinforced composite resin and post endodontic restoration; Short fiber composite