What is the purpose of glide path creation in endodontic therapy and what file size is commonly used to establish it?

• A. To remove smear layer.
• B. To create a smooth, negotiable path to the apical constriction; commonly established with a size #15–#20 file.
• C. To measure canal length.
• D. To widen the canal to a size #40-#50.

Answer: (B)

Glide path creation focuses on establishing a smooth, negotiable route to the apical constriction so subsequent shaping can proceed predictably and safely. Using a small hand file, typically size 15 to 20, clinicians create this initial path to guide later instrumentation and reduce the risk of ledging, transportation, or instrument separation. This step is about setting up a reliable track early on, not about removing the smear layer, measuring canal length, or aggressively enlarging the canal. The other options describe different goals or steps in treatment that follow glide path establishment.