Evaluation of leakage of bleaching agent through different intraorifice barriers in intracoronal bleaching technique- an in vitro study

The intracoronal bleaching procedure is largely used because it is efficient, simple and economic. Indications for internal bleaching are discoloration of pulpal origin, dentin stains, and stains not amenable to extra-coronal bleaching. Contraindications to internal bleaching are superficial enamel stains, defective enamel formation, severe dentin loss, presence of caries and discolored composites. Most bleaching agents are oxidizers that act on organic structures of the hard tissues and degrade them into smaller molecules that are lighter in color such as CO2, O2 and H2O. Comman materials which were used earlier are glass ionomer cement, amalgam, zinc phosphate cement, IRM, zinc polycarboxylate cement, silicate cements. Materials which were used in the study were MTA, Biodentine and SDR composite material as an intraorifice barrier in walking bleach technique. Placement of a barrier like Biodentine over the gutta-percha certainly enhances the seal, prevents the leakage of the bleaching materials and is an esthetic option for intraorifice barrier unlike MTA and SDR composite as use of Biodentine does not cause discoloration. This study was performed in in-vitro conditions, hence long term in-vivo studies are required to check for sealing ability of Biodentine before routine clinical usage.