How is the root canal length measuring instrument determined?

Jun 23,2025

Root Canal Length Measurement: The curved metal lip hook on the measuring line is hung at either corner of the patient's mouth, contacting the oral mucosa as a reference electrode. When the root canal file reaches the apex, adjust the rubber stop on the root canal file to the crown reference point (incisal edge or groove edge). Then remove the measured root canal file and measure the length from the tip of the root canal file to the rubber stop. This is the working length of the tooth. Note: When it is inconvenient to measure posterior teeth using a file clamp, a probe can be used instead of a file clamp.

How is the root canal length measuring instrument determined?

Hello everyone, many friends have asked how to determine the root canal length measuring instrument?

Today, let me explain it to you.

Root canal length determination:

Hang the bent metal lip hook on the measuring line on either side of the patient's oral commissure so that it contacts the oral mucosa as a reference electrode.

When the root canal file reaches the apex, adjust the rubber stop placed on the root canal file to the crown reference point (incisal edge or groove edge), then pull out the measured root canal file, and measure the length from the tip of the root canal file to the rubber stop, which is the working length of the tooth.

Note: When it is inconvenient to measure the posterior teeth using a file clamp to clamp the root canal file, a probe can be used instead of the file clamp.

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Why is there no sound from the root canal length measuring instrument? Is it broken?

How do I install a root canal length measuring instrument (apex locator)?

Why is there no sound from the root canal length measuring instrument? Is it broken?

How do I install a root canal length measuring instrument (apex locator)?

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