Which device is used to place paste into canal during obturation?

• A. Fill canal with paste
• B. Rotary paste-filler
• C. Finger spreader
• D. Apex locator

Answer: (B)

Placing paste into the canal during obturation is done with a paste-filling device because it delivers the viscous paste in a controlled way along the canal, ensuring the paste reaches and fills the canal length and irregularities. The rotary paste-filler provides continuous, regulated delivery and can work with heated gutta-percha pastes for effective obturation. In contrast, a finger spreader is used to laterally compact gutta-percha after a cone is placed, not to place paste. An apex locator helps determine working length, not filling material. Describing the action alone doesn’t specify the tool—the paste-filling device, particularly the rotary type, is what actually places the paste into the canal.