title: Effect of sealers on fracture resistance of endodontically treated teeth with and without smear layer removal: An in vitro study.
abstract: OBJECTIVE
  The present study involved the in vitro comparison of root reinforcing abilities of two sealers, i.e., Ketac-Endo and Acroseal, in endodontically treated teeth in the presence and absence of smear layer.
  
  
  METHODS
  Fifty teeth were taken and sectioned at the cementoenamel junction. The teeth with faults were discarded and a total of 36 teeth were used for study. The samples were biomechanically prepared using step-back technique. In 10 teeth, the smear layer was preserved using sodium hypochlorite. Smear layers were removed from 10 teeth using 17% EDTA, and in another 10 samples, the smear layers were eliminated using 17% EGTA. The remaining samples served as controls. Samples were obturated with sealers using the lateral condensation technique. Ketac-Endo (3M) is a glass ionomer based root canal sealer, and Acroseal (Septodont) sealers were used. The teeth were then tested by using an Instron testing machine.
  
  
  RESULTS
  Ketac-Endo shows higher fracture resistance values in comparison to Acroseal. Other factors as the amount of tooth structure remaining, the agents used for the removal of smear layer and instrumentation techniques may alter the tooth resistance to fracture.
  
  
  CONCLUSIONS
  Ketac-Endo shows higher fracture resistance values in comparison to Acroseal.
authors.affiliation: Departments of Conservative and Endodontics, Dr. H S Judge Institute of Dental Sciences and Hospital, Sector - 25, Chandigarh, India.
authors.forename: Swaty
authors.initials: S
authors.lastname: Jhamb
authors.forename: Vineeta
authors.initials: V
authors.lastname: Nikhil
authors.forename: Vijay
authors.initials: V
authors.lastname: Singh