title: In vitro resistance to fracture of roots obturated with Resilon or gutta-percha.
abstract: BACKGROUND
  There have been varied results from studies comparing postendodontic fracture resistance between teeth obturated with Resilon or gutta-percha. This study was performed to evaluate the fracture resistance of roots obturated by using Resilon (RealSeal system) or gutta-percha (with AH Plus sealer).
  
  
  METHODS
  Eighty extracted human mandibular single-rooted premolars stored in 10% formalin were used in the study. They were prepared by using a crown-down technique, debrided with NaOCl, ethylenediaminetetraacetic acid, and sterile water and divided into 4 groups. Obturation was performed by using the lateral condensation method. The negative control group consisted of unfilled specimens, and the positive control group consisted of those obturated with flowable, dual-cure composite resin. All root specimens were stored for 2 weeks in 100% humidity to allow complete setting of the sealer. Each specimen was mounted in acrylic in a polyvinyl ring and tested for fracture resistance with the Universal testing machine. The loading fixture of the machine was mounted with its spherical tip aligned with the center of the canal opening of each root. A vertical loading force was applied until it fractured the root. The force values were subjected to statistical analysis including analysis of variance and Fisher least significant difference testing.
  
  
  RESULTS
  Teeth obturated with Resilon were more resistant to fracture than those obturated with gutta-percha. The difference was found to be highly significant (P=.00001).
  
  
  CONCLUSIONS
  Resilon increased the resistance to fracture of single-rooted teeth in vitro.
authors.affiliation: Goa Dental College and Hospital, Bambolim, Goa, India.
authors.forename: Jeanne
authors.initials: J
authors.lastname: Monteiro
authors.forename: Ida de Noronha
authors.initials: Ide N
authors.lastname: de Ataide
authors.forename: Paul
authors.initials: P
authors.lastname: Chalakkal
authors.forename: Pavan Kumar
authors.initials: PK
authors.lastname: Chandra
mesh_terms: D001641:Bicuspid; D003188:Composite Resins / Q000737:chemistry / Q000627:therapeutic use; D003799:Dental Stress Analysis / Q000295:instrumentation; D004492:Edetic Acid / Q000627:therapeutic use; D004853:Epoxy Resins / Q000737:chemistry / Q000627:therapeutic use; D006171:Gutta-Percha / Q000737:chemistry / Q000627:therapeutic use*; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry / Q000627:therapeutic use*; D012388:Root Canal Irrigants / Q000627:therapeutic use; D012389:Root Canal Obturation / Q000379:methods*; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods; D012973:Sodium Hypochlorite / Q000627:therapeutic use; D013314:Stress, Mechanical; D013997:Time Factors; D014082:Tooth Fractures / Q000503:physiopathology*; D014092:Tooth Root / Q000503:physiopathology*
chemical_list: D003188:Composite Resins; D004853:Epoxy Resins; C511498:Real Seal composite resin; D012387:Root Canal Filling Materials; D012388:Root Canal Irrigants; C521331:Smear Clear; C534916:epoxy resin-based root canal sealer; C486892:resilon sealer; D006171:Gutta-Percha; D004492:Edetic Acid; D012973:Sodium Hypochlorite