Which instrument is used to enlarge the canal and create space during cleaning?

• A. Root canal file
• B. Finishing strip
• C. Root canal reamer
• D. Articulating paper

Answer: (C)

Creating space in the canal during cleaning relies on a cutting instrument designed to widen the canal lumen. The root canal reamer is built to cut dentin along the canal walls as it is rotated, progressively enlarging the diameter to create adequate space for thorough cleaning, irrigation, and eventual obturation. While a root canal file also trims and shapes, its primary role is negotiating and cleaning with patency in mind, not enlarging to the same extent. Finishing strips are for polishing surfaces, and articulating paper checks bite alignment, not canal cleaning.