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 dentinal tubules and resin-based endodontic sealers on fracture properties of root dentin.
OBJECTIVE To investigate the role of dentinal tubules in the fracture properties of human root dentin and whether resin-filled dentinal tubules can enhance fracture resistance . MATERIAL S AND METHODS Crack propagation in human root dentin was investigated in 200 microm thick longitudinal sample s and examined by light and scanning electron microscopy . 30 maxillary premolar teeth were prepared for work of fracture ( Wf ) test at different tubule orientations , one perpendicular and two parallel to dentinal tubules . Another 40 single canal premolars were r and omly divided into four groups of 10 each : intact dentin , prepared but unobturated canal , canal obturated with epoxy rein ( AH Plus/gutta percha ) , or with UDMA resin sealer ( Resilon/RealSeal . The sample s were prepared for Wf test parallel to dentinal tubules . Wf was compared under ANOVA with statistical significance set at p<0.05 . RESULTS Dentinal tubules influenced the path of cracks through dentin , with micro-cracks initiated in peritubular dentin of individual tubules ahead of the main crack tip . A significant difference ( p<0.001 ) was found between Wf perpendicular to tubule direction ( 254.9 J/m(2 ) ) vs. parallel to tubule direction from inner to outer dentin ( 479.4 J/m(2 ) ) . Neither canal preparation nor obturation using epoxy- or UDMA-based resins as sealer cements substantially influenced fracture properties of root dentin , despite extensive infiltration of dentinal tubules by both sealer cements
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 .