| 摘要 |
PURPOSE: A dental nerve killing tool is provided, which has an interval display means measuring the length of a tooth and the root of a tooth accurately by taking a radioactive picture after placing the dental nerve killing tool in the nerve of the tooth. CONSTITUTION: The dental nerve killing tool is provided with an interval display means(40) which is formed by coating a radioactive ray-impermeable material on the surface of the dental nerve killing tool at regular intervals. Preferably radioactive ray-impermeable material is lead alloy.
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