Why do you measure the length of the canal during a root canal procedure?

Measuring the length of the canal during a root canal procedure is essential to ensure proper cleaning and shaping of the root canal system. This measurement helps to determine the working length, which is the distance from the tooth's reference point to the apex of the root. Accurate length measurement prevents over-instrumentation or under-instrumentation, reducing the risk of complications and ensuring effective treatment. Additionally, it aids in the proper placement of filling materials to seal the canal effectively.