Which file is primarily used to enlarge the root canal during endodontic therapy?

The K File is specifically designed for enlarging the root canal during endodontic therapy. Its structure, characterized by a helical design and varying tapers, allows for effective cutting and shaping of the canal walls. This feature is crucial for creating a smooth canal shape that facilitates the subsequent cleaning and filling stages of root canal treatment.

The K File's flexibility enables it to navigate the curvatures of the root canal system while still maintaining its cutting efficiency. This is essential in the intricate and often branching architecture of dental pulp canals, ensuring thorough preparation of the canal for optimal treatment outcomes.

Other tools mentioned have distinct functions: the Endo file may refer generally to instruments used in endodontic procedures, but it does not specify a type suited for enlarging the canal like the K File. A Reamer, while also effective at enlarging canals, is designed with fewer flutes and is typically used for a more aggressive cutting action or for creating a larger canal space in conjunction with other instruments. A Broach is primarily used for removing pulp tissue and debris, not for enlarging the canal itself. Each tool plays a unique role in the endodontic procedure, but the K File is the most effective for canal enlargement.