Which statement is true about paper points used in endodontics?

• A. They are used to irrigate the canal
• B. They are used to seal the canal after obturation
• C. They are used to measure working length
• D. They are used to dry the canal

Answer: (D)

Drying the canal with paper points is the important step here. After irrigation, moisture can remain in the canal and on the dentinal walls, and paper points—sterile, absorbent cones—are used to blot away that moisture. Achieving a dry canal helps the sealer and gutta-percha to seal properly and reduces the chance of voids or compromised obturation. They aren’t used to irrigate the canal, since irrigation is done with solutions delivered by syringe or needle. They don’t seal the canal after obturation—the sealing is accomplished by the filling materials themselves. They also don’t measure working length—the length is determined with specialized files and sometimes apex locators and radiographs. Paper points are chosen and used to match the canal size and remove residual moisture until a truly dry canal is achieved.