title: Evaluation of resistance of teeth subjected to fracture after endodontic treatment using different root canal sealers: an in vitro study.
abstract: OBJECTIVE
  The aim of this study was to compare the ex-vivo effects of different root canal sealers on the fracture resistance of endodontically treated teeth.
  
  
  METHODS
  Seventy-five freshly extracted human mandibular premolars were used for the study. The length was standardized to 14 mm and all the teeth were biomechanically prepared and divided into five different groups based on the type of root canal sealers used. Group I:- Roeko seal + gutta percha, Group II: AH plus ® root canal sealer + gutta percha, Group III: PULPDENT root canal sealer + gutta percha, Group IV: Zinc oxide-eugenol sealer + gutta percha, Group V: Control (unobturated teeth). The teeth were embedded in acrylic resin blocks and compressive strengths were measured using universal testing machine (Instron).
  
  
  METHODS
  One-way ANOVA, unpaired t- test.
  
  
  RESULTS
  Data obtained were statistically evaluated using one-way ANOVA and unpaired t-test. All groups showed a statistically significant result (P < 0.05). Teeth obturated with Group I and Group II showed higher resistance to fracture than teeth obturated with other three Groups. It was seen that the teeth obturated with group III showed a better fracture resistance than Group IV and there was no statistical significance found between Group and Group V.
  
  
  CONCLUSIONS
  From this study, it has been concluded that both the resin based sealers that were used in this study were equally effective compared to that of the zinc oxide-based sealers and the control group. However, no significant results were obtained when the comparison was made between zinc oxide-eugenol and gutta-percha and the control group.
authors.affiliation: Department of Paedodontics and Preventive Dentistry, Yenepoya Dental College, Mangalore, Karnataka, India. viceprincipalydc@yenepoya.edu.in
authors.forename: S S
authors.initials: SS
authors.lastname: Bhat
authors.forename: S K
authors.initials: SK
authors.lastname: Hegde
authors.forename: A
authors.initials: A
authors.lastname: Rao
authors.forename: A K
authors.initials: AK
authors.lastname: Shaji Mohammed
mesh_terms: D001641:Bicuspid / Q000503:physiopathology; D002126:Calcium Hydroxide / Q000627:therapeutic use; D019245:Compressive Strength; D003738:Dental Cements / Q000627:therapeutic use; D003799:Dental Stress Analysis / Q000295:instrumentation; D004853:Epoxy Resins / Q000627:therapeutic use; D006171:Gutta-Percha / Q000627:therapeutic use; D006801:Humans; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000627:therapeutic use*; D018915:Root Canal Preparation / Q000379:methods; D012390:Root Canal Therapy / Q000379:methods*; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000503:physiopathology*; D019553:Tooth, Nonvital / Q000628:therapy*; D015035:Zinc Oxide-Eugenol Cement / Q000627:therapeutic use
chemical_list: D003738:Dental Cements; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C534916:epoxy resin-based root canal sealer; C465381:roeko seal; C029777:Pulpdent; D006171:Gutta-Percha; D002126:Calcium Hydroxide