Impact of Different Intraorifice Barriers on Fracture Resistance of Non-Vital Bleached Teeth

Abstract

Background and Aim: This study aimed to evaluate the effects of bleaching agents on the fracture resistance of endodontically treated teeth using  different intraorifice barrier (IOB) materials.

Materials and Methods: The endodontic treatment was performed for 160 mandibular premolars, and then,  the teeth were divided into four groups according to the IOB: Ionoseal, Biodentine, ProRoot MTA, and TheraBase. Then, these teeth were  subdivided into four subgroups (n = 10) based on the bleaching agents as distilled water (control), hydrogen peroxide 35% (HP), sodium perborate (SP),  and carbamide peroxide 37% (CP). The access cavities were restored with composite resin after applying the bleaching agents for 7 days. The fracture  resistance test was performed using a universal testing machine. Data were statistically analyzed, and the significance level was set at 5%. A scanning  electron microscope was used to evaluate the effect of bleaching agents on the surfaces of IOBs.

Results: The highest fracture resistance values were  observed in Biodentine groups with significant differences compared to Ionoseal and ProRoot MTA (P <.05). The distilled water groups showed  significantly the highest fracture resistance compared to SP and HP groups (P <.05). There was no significant difference between SP, HP, and CP groups (P  >.05). It was demonstrated that the morphological surface of the intact IOBs (control) was different from the surface of IOBs treated with bleaching  agents.

Conclusion: The intracoronal bleaching procedures affected negatively the fracture resistance of the endodontically treated teeth.