What is the ideal length of the root canal treatment (RCT) from the apex?

The ideal length of root canal treatment (RCT) is typically aimed at being 0.5 to 1.5 mm short of the apex. This approach is preferred because it helps to achieve adequate cleaning and filling of the canal while minimizing the risk of complications such as perforation of the apex or extrusion of filling material beyond the root tip. Staying within this range allows for the optimal sealing of the canal system without overly risking damage to the surrounding periapical tissues.

Being too close to the apex or at the apex may lead to potential complications, such as over-filling or inadvertent damage to periapical tissues, which can result in inflammation or a flare-up of symptoms. Properly managing the length of the canal filling is crucial to ensure the long-term success of the treatment while maintaining the health of surrounding structures.