Optimizing Post-Endodontic Outcomes: A Review On Efficacy Of Intraorifice Barrier Materials In Endodontically Treated Teeth

Abstract

The long-term success of endodontically treated teeth depends not only on proper canal disinfection and obturation but also on preventing coronal microleakage and preserving structural integrity. Intraorifice barriers (IOBs) are restorative materials placed within the coronal portion of the root canal system after obturation, serving to reinforce the cervical dentin and act as a secondary seal against microbial infiltration. This review explores the rationale, ideal properties, and clinical performance of various materials used as IOBs. Materials such as Biodentine, mineral trioxide aggregate (MTA), resin-modified glass ionomer cements (RMGICs), bulk-fill flowable composites(BFC), and resin-modified calcium silicate cements have demonstrated varying degrees of efficacy in reducing coronal leakage and enhancing fracture resistance. Biodentine offers superior mechanical properties and bioactivity; MTA provides excellent sealing but is technique sensitive. RMGICs offer fluoride release and ease of handling but may show lower fracture resistance. Bulk-fill flowable composites allow deep curing and good adaptation, while resin-modified calcium silicate cements like TheraCal LC combine biocompatibility with convenient light-curing. ParaCore, a dual-cure composite, exhibits high compressive strength and monoblock bonding when used with adhesives. Evidence suggests that IOBs not only enhance the longevity of endodontic treatment but also serve a protective role during intracoronal bleaching. However, material selection should consider handling characteristics, removal feasibility, and long-term stability. Further in vivo studies are necessary to standardize protocols and validate long-term clinical outcomes.