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- W48809327 abstract "Electronic Apex Locators (EAL) have become widely used in the last decade. The first apex locator was introduced in 1962, based on a constant electrical resistance (6.5 K.) between the oral mucosa and periodontal ligament. The first and second generations of EAL were inaccurate and could not detect the apex in the presence of conducting fluids. The third generation solved this problem by using two alternating frequencies and calculating the impedance between them. This provided reliable and accurate results in dry canals, or in the presence of blood, electrolytes or other fluid in the root canals, when the pulp was necrotic or when there was a perforation along the root. The Root ZX and Apit (Endex) are the most documented devices. The new fourth generation of apex locators is a diverse group: some use multifrequency currents, others use a lookup matrix rather than calculate the readings. Several of the newer EALs are smaller, and others connect to computers." @default.
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- W48809327 date "2009-04-01" @default.
- W48809327 modified "2023-09-23" @default.
- W48809327 title "[Electronic Apex Locator as a dental instrument]." @default.
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