For effective diagnosis and treatment planning in root canal therapy, what must be available?

For effective diagnosis and treatment planning in root canal therapy, having X-ray film is crucial because it provides essential visualization of the tooth's internal structures, including the root canals and periapical areas. These images help the clinician identify the number and shape of the canals, the presence of any infections or abscesses, and the overall condition of the tooth. X-rays are a foundational tool in endodontics, enabling accurate assessment of the pathology and aiding in the development of a suitable treatment plan.

While dental charts, patient medical history, and clinical photographs are all valuable components of a comprehensive approach to patient care, they do not offer the direct visual insights into the internal anatomy of the tooth that X-ray films do. Therefore, the use of radiographs is essential for the precise evaluation required in root canal therapy.