title: Intraorifice sealing ability of different materials in endodontically treated teeth: An in vitro study.
abstract: BACKGROUND
  Microbial contamination of the pulp space is one of the major factors associated with endodontic failure. Thus, in addition to a three dimentional apical filling a coronal seal for root canal fillings has been recommended.
  
  
  OBJECTIVE
  The present study was conducted to evaluate and compare the intra-orifice sealing ability of three experimental materials after obturation of the root canal system.
  
  
  METHODS
  Fourty single rooted mandibular premolars were decoronated, cleaned, shaped and obturated. Gutta-percha was removed to the depth of 3.5 mm from the orifice with a heated plugger. Ten specimens each were sealed with Light Cure Glass Ionomer Cement (LCGIC), Flowable Composite (Tetric N-Flow), and Light Cure Glass Ionomer Cement with Flowable Composite in Sandwich Technique along with a positive control respectively and roots submerged in Rhodamine-B dye in vacuum for one week. Specimens were longitudinally sectioned and leakage measured using a 10X stereomicroscope and graded for depth of leakage.
  
  
  RESULTS
  According to the results of the present study LC GIC + Tetric N Flow demonstrated significantly better seal (P < 0.01) than LC GIC. However there was no statistically significant difference in leakage (P > 0.01) between Tetric N-Flow and LCGIC+Tetric N-Flow groups.
  
  
  CONCLUSIONS
  In the current study LCGIC+Tetric N-Flow was found to be superior over other experimental materials as intra-orifice barriers.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Terna Dental College, Navi Mumbai, Maharashtra, India.
authors.forename: Bandish
authors.initials: B
authors.lastname: Parekh
authors.affiliation: Department of Conservative Dentistry and Endodontics, M. A. Rangoonwala College of Dental Sciences and Research Centre, Pune, Maharashtra, India.
authors.forename: Rukshin S
authors.initials: RS
authors.lastname: Irani
authors.affiliation: Department of Conservative Dentistry and Endodontics, M. A. Rangoonwala College of Dental Sciences and Research Centre, Pune, Maharashtra, India.
authors.forename: Sucheta
authors.initials: S
authors.lastname: Sathe
authors.affiliation: Department of Conservative Dentistry and Endodontics, M. A. Rangoonwala College of Dental Sciences and Research Centre, Pune, Maharashtra, India.
authors.forename: Vivek
authors.initials: V
authors.lastname: Hegde
keywords: Dye under vacuum; microleakage; orifice barrier