Coronal restorations and posts can positively influence the long-term prognosis of teeth following root canal therapy. Final sealing the canal by placing an appropriate post and core will minimize leakage of oral fluids and bacteria into the periradicular area and is recommended as soon as possible after completion of root canal filling. Glass ionomer or MTA placed over the residual root canal filling after post space preparation may be effective to prevent bacterial leakage. A ferrule of 1-2 mm of tooth tissue coronal to the finish line of the crown significantly improves the fracture resistance of the tooth and is more important than the type of the material the core and post are made of.
Slutzky-Goldberg, I., Slutzky, H., Gorfil, C., & Smidt, A. (2010). Restoration of Endodontically Treated Teeth Review and Treatment Recommendations. International Journal of Dentistry, 2009, 1–9. https://doi.org/10.1155/2009/150251