Although the majority of the studies reported that the use of root canal sealers increased the fracture resistance of endodontically treated teeth , conflicting evidence was found for the reinforcing effect of resin , glass ionomer , and calcium silicate-based sealers while there was moderate evidence for zinc oxide eugenol-based sealers in favor of no reinforcing effect .
Conclusion On the basis of available evidence , the use of root canal sealer increases the fracture resistance of endodontically treated teeth .
Regarding the comparisons among the sealers , no conclusions could be drawn for the superiority of one sealer type to another .
Objective The purpose of this study was to systematic ally review and critically analyze the published data of in vitro studies testing the effect of root canal sealers on the fracture resistance of endodontically treated teeth .
Resistance to Fracture of Dental Roots Obturated with Different Materials
The aim of this study was to compare the vertical fracture resistance of roots obturated with different  root canal filling material s and sealers .  Crowns of 55 extracted m and ibular premolar teeth were removed to provide root lengths of 13 mm . Five roots were saved as negative control group ( canals unprepared and unfilled ) . Fifty root canals were instrumented and then five roots were saved as positive control group ( canals prepared but unfilled ) . The remaining 45 roots were r and omly divided into three experimental groups ( n = 15 root/group ) and obturated with the following procedures : in group 1 , glass ionomer-based sealer and cone ( ActiV GP obturation system ) ; in group 2 , bioceramic sealer and cone ( EndoSequence BC obturation system ) ; and in group 3 , roots were filled with bioceramic sealer and cone ( Smartpaste bio obturation system ) . All specimens were tested in a universal testing machine for measuring fracture resistance . For each root , the force at the time of fracture was recorded in Newtons . The statistical analysis was performed by using Kruskal-Wallis and post hoc test . There were no significant differences between the three experimental groups . The fracture values of three experimental and negative control groups were significantly higher than the positive control group . Within the limitations of this study , all material s increased the fracture resistance of instrumented roots
Although the majority of the studies reported that the use of root canal sealers increased the fracture resistance of endodontically treated teeth , conflicting evidence was found for the reinforcing effect of resin , glass ionomer , and calcium silicate-based sealers while there was moderate evidence for zinc oxide eugenol-based sealers in favor of no reinforcing effect .
Conclusion On the basis of available evidence , the use of root canal sealer increases the fracture resistance of endodontically treated teeth .
Regarding the comparisons among the sealers , no conclusions could be drawn for the superiority of one sealer type to another .
Objective The purpose of this study was to systematic ally review and critically analyze the published data of in vitro studies testing the effect of root canal sealers on the fracture resistance of endodontically treated teeth .