Why would a root canal length measuring instrument break?

Jun 24,2025

Hello everyone, today I will explain why root canal length measuring instruments (apex locators) malfunction, how to troubleshoot them, and the causes of malfunctions. These are some solutions and causes of common problems. In fact, accurate operation of the apex locator according to the instructions can prolong its service life. Improper operation may lead to malfunctions or damage.

Why would a root canal length measuring instrument break?

Hello everyone, today I will explain why root canal length measuring instruments may malfunction, how to troubleshoot them, and the causes of malfunctions.

Serial Number	Malfunction	Possible Causes	Troubleshooting
1	Device will not power on	Low battery	Please charge
1	Device will not power on	Is the battery installed correctly?	Please reinstall the battery
2	Unstable readings during measurement: measured length is too long or too short; poor accuracy, irregular data display	Does the lip hook maintain good contact with the oral mucosa?	Move the lip hook to a position where it maintains good contact with the oral mucosa.
		Is there any medication or debris on the tooth surface?	Clean the tooth surface.
		Does the root canal needle touch the gingiva?	When the root canal needle touches the gingiva, the LCD screen will immediately jump to "-1".
		Is there any caries on the adjacent surface?	The measuring current flows from the adjacent caries to the gingiva, thus preventing accurate measurement of the root canal working length.
		Is there a cyst at the root apex?	In the case of a cyst, the root canal length cannot be accurately measured.
		Is the file holder dirty or damaged?	Clean the file holder with disinfectant alcohol or replace it.
		Is the measuring wire damaged or making poor contact?	Short-circuit the two ends of the measuring wire; a reading of "-1" indicates that the measuring wire connection is normal.
3	The length indicator only fully displays near the apical constriction.	Is the root canal obstructed?	The display will be normal after passing through the apical constriction.
		Is the root canal extremely dry?	Moisten the root canal with hydrogen peroxide or saline solution.
		Is a small root canal needle being used in a large root canal?	Select a root canal needle of the appropriate size.

These are some common troubleshooting methods and causes. Accurate operation according to the instructions can actually extend the service life of the root canal length measuring instrument. Improper operation may lead to malfunctions or damage.

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