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 .
Influence of periodontal ligament simulation on bond strength and fracture resistance of roots restored with fiber posts
Objective Considering that periodontal ligament simulation may influence the stress distribution over teeth restored with intraradicular retainers , this study aim ed to assess the combined effect of mechanical cycling and periodontal ligament simulation on both the bond strength between fiber posts and root dentin and the fracture resistance of teeth restored using glass fiber posts . Material and Methods Ninety roots were r and omly distributed into 3 groups ( n=10 )  ( C-MC : control ; P-MC : polyether ; AS-MC : addition silicone ) to test bond strength and 6 groups ( n=10 )  ( C : control ; P : polyether ; AS : addition silicone , without mechanical cycling , and C-MC , P-MC and AS-MC with mechanical cycling ) to test fracture strength , according to the material used to simulate the periodontal ligament . For the bond strength test , fiber posts were cemented , cores were built , mechanical cycling was applied ( 2 × 106 cycles , 88 N , 2.2 Hz , and 45º incline ) , and the teeth cut into 3 slices ( 2 mm ) , which were then subjected to the push-out test at 1 mm/min . For the fracture strength test , fiber posts were cemented , cores were built , and half of the groups received mechanical cycling , followed by the compressive strength ( 45 ° to the long axis and 1 mm/min ) performed on all groups . Results Periodontal ligament simulation did not affect the bond strength ( p=0.244 ) between post and dentin . Simulation of periodontal ligament ( p=0.153 ) and application of mechanical cycling ( p=0.97 ) did not affect fracture resistance . Conclusions The material s used to simulate the periodontal ligament did not affect fracture or bond strength , therefore periodontal ligament simulation using the tested material s could be considered optional in the conditions of the study
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 .