title: Monoblocks in root canals: a finite elemental stress analysis study.
abstract: OBJECTIVE
  To investigate using finite element stress analysis (FEA) primary, secondary and tertiary monoblocks created either by adhesive resin sealers or by different adhesive posts and to evaluate the effect of interfaces on stress distribution in incisor models.
  
  
  METHODS
  Seven maxillary incisor FEA models representing different monoblocks using several materials were created as follows: (a) primary monoblock with Mineral Trioxide Aggregate; (b) secondary monoblock with sealer (MetaSEAL) and Resilon; (c) tertiary monoblock with EndoREZ; (d) primary monoblock with polyethylene fibre post-core (Ribbond); (e) secondary monoblock with glass-fibre post and resin cement; (f) tertiary monoblock with bondable glass-fibre post; (g) tertiary monoblock with silane-coated ceramic post. A 300 N load was applied from the palatal surface of the crown with a 135° angle to the tooth long axis. Materials used in the study were assumed to be homogenous and isotropic except the glass-fibre post; the results are expressed in terms of von Mises criteria.
  
  
  RESULTS
  Maximum stresses were concentrated on force application areas (18-22.1 MPa). The stresses within the models increased with the number of interfaces both for the monoblocks created by the sealers (1.67-8.33 MPa) and for the monoblocks created by post-core systems (1.67-11.7 MPa).
  
  
  CONCLUSIONS
  Stresses within roots increased with an increase in the number of the adhesive interfaces. Creation of a primary monoblock within the root canal either by an endodontic sealer or with an adhesive post-core system can reduce the stresses that occur inside the tooth structure.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey. sbelli@selcuk.edu.tr
authors.forename: S
authors.initials: S
authors.lastname: Belli
authors.forename: O
authors.initials: O
authors.lastname: Eraslan
authors.forename: G
authors.initials: G
authors.lastname: Eskitascioglu
authors.forename: V
authors.initials: V
authors.lastname: Karbhari
mesh_terms: D017607:Aluminum Compounds; D001696:Biomechanical Phenomena; D017610:Calcium Compounds; D003188:Composite Resins / Q000737:chemistry; D003198:Computer Simulation; D003738:Dental Cements / Q000737:chemistry; D003786:Dental Pulp Cavity; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D004338:Drug Combinations; D020342:Finite Element Analysis; D006801:Humans; D007180:Incisor; D008437:Maxilla; D008689:Methacrylates / Q000737:chemistry; D008954:Models, Biological; D010087:Oxides; D011095:Polyethylenes / Q000737:chemistry; D011176:Post and Core Technique; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods*; D017640:Silicates; D013314:Stress, Mechanical
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003188:Composite Resins; D003738:Dental Cements; D004338:Drug Combinations; C481259:EndoRez; D008689:Methacrylates; D010087:Oxides; D011095:Polyethylenes; C084063:RIBBOND; D012387:Root Canal Filling Materials; D017640:Silicates; C534239:metaseal; C086631:mineral trioxide aggregate; C486892:resilon sealer