Coronal seal in endodontics: a critical but forgotten element

The success of root canal treatment depends greatly on maintaining asepsis throughout the procedure and achieving effective disinfection of the root canal system. In this context, the concept of the seal holds significant clinical importance. While the apical seal created by the root canal filling has traditionally received emphasis, the role of the coronal seal provided by a well-placed restoration has been a topic of ongoing discussion. This review aims to comprehensively examine the evidence from microbiologic, clinical, and materials science perspectives to highlight the importance of an integrated approach. Data from the scientific literature demonstrate that both a well-executed root canal filling and a timely, high-quality coronal restoration are essential for the long-term success and survival of endodontically treated teeth. This review also discusses the importance of timing in the placement of the coronal restoration and evaluates the properties of different materials used to achieve an effective coronal seal. The findings reinforce the need for clinicians to ensure that a permanent coronal seal is placed as soon as possible after root canal treatment.