Evidence confirms that fluid-tight obturation is critical to long-term success, as it seals the root canal space to prevent the ingress of microorganisms and the egress of lingering bacteria into periradicular tissues. According to a systematic review in the Journal of Endodontics, poor obturation quality—specifically inadequate length or density—is a leading cause of post-treatment disease. Expert consensus underscores that while disinfection is paramount, a seal and high quality coronal barrier is necessary to maintain a healthy periapical environment.
