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Which instrument cuts only on the pull stroke and helps make dentinal walls smooth?
Reamer
Files
Scalpel
Hedstrom file
The correct answer is: Hedstrom file
The Hedstrom file is specifically designed to cut only on the pull stroke, making it particularly effective for shaping and smoothing the dentinal walls of the root canal during endodontic procedures. Its design, which features a tightly wound spiral pattern, enhances its cutting efficiency on the pull stroke while minimizing the risk of pushing debris apically. This characteristic allows for better control and a cleaner, smoother finish compared to other instruments, which may cut in both directions or are not as specialized for this specific function. The unique configuration of the Hedstrom file ensures that it provides a high-quality finish to the root canal walls, crucial for successful endodontic treatment.