Fracture resistance of endodontically treated teeth restored with bulk-fill materials at different depths in root canals
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Abstract
Objective: This study aims to compare fracture resistance of endodontically treated teeth restored with different bulk-fill materials as core materials and with different depths into the root canals.
Materials and Methods: Endodontically treated teeth with mesio-occluso-distal (MOD) cavities were prepared from extracted premolar teeth and divided into 3 experimental groups and 1 positive control group without any restorations. The teeth in experimental groups were divided into 2 subgroups according to the depth of gutta percha removal (1: the level of cemento-enamel junction (CEJ), and 2: the level of 3 mm-below CEJ). The teeth were then restored with an ClearfilTM SE bond in combination with one of the following materials; light-curing bulk-fill materials: Ever-X posterior or SDR flow, or a self-curing core material: Multicore flow, and finally restored the top layer by Filtek Z350XT. The intact teeth were used as a negative control. All specimens were subjected to fracture resistance testing.
Results: The highest fracture resistance was observed in the negative control group (1438.83 ± 224.11N). No statistically significant differences were found between the group restored with bulk-fill materials (p>0.05) except between the group restored with the Multicore flow at CEJ and the group restored with Multicore flow below the level of 3 mm-below CEJ (p=0.028). The lowest fracture resistance value was found in the positive control group (298.16 ± 62.67N).
Conclusion: The restorations of endodontically treated teeth with light-curing bulk-fill materials could improve fracture resistance which was less than the fracture resistance of intact teeth.
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