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 .
Fracture resistance of overtly flaring root canals filled with resin-based obturation material
Background : Reinforcement of root canals obturated with Resilon was reported by several investigators , but no studies reported the reinforcement of overtly flared root canals obturated with Resilon material . The aim of this study was to investigate the fracture resistance of overtly flared root canals filled with Resilon as compared to similar root canals filled with gutta-percha ( GP ) . Material s and Methods : Sixty single-rooted premolars were divided r and omly into six groups . Group 1 served as control group . The control group was sub-divided into two groups , a negative group and a positive group . The negative group consisted of root canals that were only cleaned from residual pulpal tissues , however , the positive group had prepared and overtly flared root canals without obturation . Groups 2 and 4 were shaped using 0.04 taper rotary files , while groups 3 and 5 were shaped using 0.06 taper rotary files . Before obturation , the last four groups were further flared coronally with a reverse cone diamond bur . Groups 2 and 3 were obturated with GP and a resin-based sealer , while groups 4 and 5 were obturated with Resilon and Epiphany self-etching primer and Epiphany sealer . Roots were then fixed into a universal testing machine and vertically loaded until fracture . SPSS software ( Release 9.0 for Windows , SPSS , Chicago , USA ) was used to perform the statistical analysis . Results : Fracture resistance measurements showed that there were differences in resistance to fracture among the experimental groups ( ANOVA , P < 0.0001 ) . Mean values of the loading force applied to the negative control group were the highest at 1.81 KN , whereas the mean values for the Resilon groups ( Groups 4 and 5 ) at 1.13 KN and 1.54 KN were found to be higher than the GP groups ( Groups 2 and 3 ) at 0.45 KN and 0.88 KN , respectively . Tukey 's post hoc test showed that there was no statistical difference between the mean values of the negative control group and Group 5 ( P = 0.69 ) . Conclusion : Obturation of overtly flared roots with Resilon material increased the resistance of these teeth to vertical root fracture
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 .