Endometry
Endometry , also known as electrometric length determination, refers to the measurement of the root canal length of a tooth with an electronic measuring device, a so-called apex locator. The measurement is based on the fact that there is a constant electrical resistance between the root membrane and the mucous membrane , which suddenly drops when the root tip is reached. In addition to radiographic length determination and length determination by means of tactility (sensitivity), endometric measurement is currently the most precise method for the exact length determination of the root canal . such as irrigation solutions, blood or pus could be affected.
To measure, a thin, metal root canal instrument is inserted into the root canal, which is connected to the measuring device.
Measurement accuracy
In the apical area, small branches and side canals often form a so-called apical delta (apical ramification ) with accessory foramina . Due to larger or too many side channels and the resulting lower electrical resistance value <6.5 kΩ, measurement errors can occur in some cases.
In root canal treatment , the most complete possible preparation and disinfection of the canal system is important for the long-term preservation of a tooth . For this, the preparation length of the tooth must be known. With the help of multi-frequency measurement data, the device shows the transition between the canal wall on the inside of the root and the tooth holding apparatus on the outside of the root.
This type of electrometric length measurement is usually more accurate than a radiological measurement.
Individual evidence
- ↑ Hör, D et al .: Ex vivo comparison of two electronic apex localisators with different scales and frequencies. Int Endod J. 2005 Dec; 38 (12): 855-9. PMID 16343110
- ↑ http://www.bzb-online.de/mai08/43_53.pdf W. Gänsler Endodontic Revisions - Chances and Limitations, BZB May 2008, pp. 43–45