title: The effect of resin-based sealers on fracture properties of dentine.
abstract: OBJECTIVE
  To determine whether resin-based sealer cements are able to strengthen root dentine, as measured by work of fracture (Wf), micro-punch shear strength (MPSS) and resistance to vertical root fracture (VRF).
  
  
  METHODS
  One hundred and twenty extracted premolar teeth were randomly assigned amongst four treatments before testing: intact, root canals prepared but unfilled, or root filled using epoxy- or urethane dimethacrylate (UDMA)-based sealer (plus core material). Samples were then prepared for measuring Wf, MPSS or VRF using standard test procedures. Data were analyzed using one-way anova with significance set at P < 0.05.
  
  
  RESULTS
  For all three tests, root canals filled using epoxy resin-based sealer were not statistically significantly different compared with UDMA resin (P = 1 for Wf, P = 0.7 for MPSS and P = 0.12 for VRF), or different from both sound and prepared dentine (P > 0.05). There was also no significant difference between sound dentine and prepared dentine for both Wf (P = 0.92) and resistance to VRF (P = 1).
  
  
  CONCLUSIONS
  Neither epoxy nor UDMA resins used as sealer cements enhanced fracture resistance of root dentine when placed within root canals of extracted teeth.
authors.affiliation: School of Dental Science, The University of Melbourne, Melbourne, Victoria, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Jainaen
authors.forename: J E A
authors.initials: JE
authors.lastname: Palamara
authors.forename: H H
authors.initials: HH
authors.lastname: Messer
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000503:physiopathology; D003188:Composite Resins / Q000737:chemistry; D019245:Compressive Strength; D003786:Dental Pulp Cavity / Q000503:physiopathology* / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000503:physiopathology* / Q000648:ultrastructure; D055119:Elastic Modulus; D004853:Epoxy Resins / Q000737:chemistry; D006171:Gutta-Percha / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012387:Root Canal Filling Materials / Q000737:chemistry*; D018915:Root Canal Preparation; D033081:Shear Strength; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000503:physiopathology*; D055815:Young Adult
chemical_list: D003188:Composite Resins; D004853:Epoxy Resins; D008689:Methacrylates; D011140:Polyurethanes; C511498:Real Seal composite resin; D019279:Resin Cements; D012387:Root Canal Filling Materials; C534916:epoxy resin-based root canal sealer; C486892:resilon sealer; C029824:urethane dimethacrylate luting resin; D006171:Gutta-Percha