To establish the working length at the root tip during root canal therapy, what should the dentist do?

The correct approach to establish the working length at the root tip during root canal therapy is to utilize the exact measurement from the X-ray. This method allows the dentist to accurately determine the length of the root canal, which is essential for effective treatment. X-ray imaging provides a visual representation of the tooth's anatomy, enabling the practitioner to assess the relationship between the root canal and surrounding structures. By measuring the lengths depicted on the radiograph, the dentist can ensure that instrumentation and obturation of the canal is performed at the right depth, reducing the risk of leaving infected tissue or damaging the root apex.

This method stands in contrast to relying on other techniques that can lead to inaccuracies. Estimating based on experience lacks the precision necessary for effective root canal treatment, as individual anatomical variations can lead to significant errors. While using a file to measure can serve as an adjunct method, it is less accurate than referencing a well-taken radiographic image. Trusting cavity depth alone is also problematic, as it does not account for the complex anatomy of the root canal system and might not correspond accurately to the actual length of the root. Therefore, using an exact measurement from the X-ray is the most reliable and clinically validated approach for determining working length in root canal therapy