title: Resistance of teeth with simulated incomplete rhizogenesis with intraradicular post or root canal filling.
abstract: OBJECTIVE
  The aim of this study was to evaluate the fracture strength (FS) of bovine incisors with simulated incomplete rhizogenesis (IR) after different intraradicular treatments.
  
  
  METHODS
  Incomplete rhizogenesis was simulated by sectioning the crowns and roots of 40 bovine incisors. Root canal preparation was performed and the samples divided into 4 groups (n = 10): GI-negative control with intra-radicular preparation; GII-positive control without intra-radicular preparation; GIII-glass fiber post cemented with resin cement and GIV-root canal obturation with Epiphany/Resilon system. In GIII and GIV, 4.0 mm apical plugs of mineral trioxide aggregate (MTA) were done. The samples were embedded into cylinders with polystyrene resin, and the periodontal ligament was simulated with a medium-viscosity polyether-based impression material (Impregum Soft). The specimens were submitted to compressive fracture strength test (0.5 mm/min at 135° in relation to the long axis of the tooth) in a mechanical testing machine MTS 810. Data were submitted to ANOVA and Tukey's test (α = 0.05).
  
  
  RESULTS
  GIII produced the highest FS values (p < 0.05). GI and GIV showed similar FS results (p > 0.05) but smaller than GII (p < 0.05).
  
  
  CONCLUSIONS
  Glass fiber intraradicular posts provided the FS increase of teeth with simulated incomplete rhizogenesis. Epiphany/Resilon root canal flling with MTA plug did not provide the increase of the fracture strength to teeth with simulated incomplete rhizogenesis.
  
  
  CONCLUSIONS
  The fiber post reinforces the root structure of teeth with incomplete rhizogenesis.
authors.affiliation: Professor, Department of Restorative Dentistry, Araraquara Dental School, Araraquara, São Paulo, Brazil, e-mail: tanomaru@uol.com.br.
authors.forename: Mario
authors.initials: M
authors.lastname: Tanomaru-Filho
authors.affiliation: Professor, Department of Restorative Dentistry, Araçatuba Dental School Araçatuba, Sao Paulo, Brazil.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Sivieri-Araujo
authors.affiliation: Professor, Department of Restorative Dentistry, Araraquara Dental School, Araraquara, São Paulo, Brazil.
authors.forename: Juliane M
authors.initials: JM
authors.lastname: Guerreiro-Tanomaru
authors.affiliation: Professor, Department of Dentistry, Santa Catarina Federal University Santa Catarina, Brazil.
authors.forename: Eduardo A
authors.initials: EA
authors.lastname: Bortoluzzi
authors.affiliation: Doctor, Department of Restorative Dentistry, Araraquara Dental School, Araraquara, São Paulo, Brazil.
authors.forename: Erica G
authors.initials: EG
authors.lastname: Jorge
authors.affiliation: Professor, Department of Prosthodontics, Araraquara Dental School Araraquara, São Paulo, Brazil.
authors.forename: Filipe O
authors.initials: FO
authors.lastname: Abi-Rached
authors.affiliation: Professor, Department of Prosthodontics, Araraquara Dental School Araraquara, São Paulo, Brazil.
authors.forename: José Mauricio S N
authors.initials: JM
authors.lastname: Reis
mesh_terms: D017607:Aluminum Compounds / Q000627:therapeutic use; D000818:Animals; D001696:Biomechanical Phenomena; D017610:Calcium Compounds / Q000627:therapeutic use; D002417:Cattle; D019245:Compressive Strength; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis / Q000295:instrumentation; D004338:Drug Combinations; D005898:Glass / Q000737:chemistry; D008422:Materials Testing; D010087:Oxides / Q000627:therapeutic use; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D017640:Silicates / Q000627:therapeutic use; D013314:Stress, Mechanical; D019227:Tooth Apex / Q000502:physiology*; D014082:Tooth Fractures / Q000503:physiopathology
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003764:Dental Materials; D004338:Drug Combinations; D010087:Oxides; D019279:Resin Cements; D012387:Root Canal Filling Materials; D017640:Silicates; C486893:epiphany sealer; C009753:fiberglass; C086631:mineral trioxide aggregate; C486892:resilon sealer