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 .
Effect of EDTA, sodium hypochlorite, and chlorhexidine gluconate with or without surface modifiers on dentin microhardness.
INTRODUCTION This study aim ed to evaluate the effects of  root canal irrigants on the microhardness of root canal dentin in the presence and absence of surface-modifying agents . METHODS Forty-eight root halves were prepared by longitudinal splitting of the distal roots of 24 freshly extracted m and ibular human third molars and embedded in autopolymerizing acrylic resin , leaving the dentin surface exposed . After polishing , the microhardness values of the untreated dentin surfaces were recorded by using Vickers tester at the mid-root level . The root halves were r and omly assigned to 6 groups composed of 8 sample s each and treated for 5 minutes with one of the following irrigants : 17 % EDTA , REDTA , 2 % chlorhexidine gluconate ( CHX ) , 2 % CHX with surface modifiers ( CHX-Plus ) , 6 % NaOCl , or 6 % NaOCl with surface modifiers ( Chlor-XTRA ) . After surface treatment , dentin microhardness values were recorded at close proximity to the initial indentation areas . Experimental data were statistically analyzed by using the t test and one-way analysis of variance , followed by Tukey honestly significant difference test at α = 0.05 . RESULTS EDTA , REDTA , NaOCl , and Chlor-XTRA significantly decreased the microhardness of root dentin compared with intact controls ( P < .05 ) . CONCLUSIONS The addition of surface modifiers to the irrigants did not affect the microhardness of the sample
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 .