Technological evolution is the hallmark of all scientific and clinical effort.
Electronic devices find their usefulness when root canals are covered by anatomical structures (zygomatic arch, teeth overlapping roots, excessive density bone) or there are pathological processes on the tooth (root fracture, intern land external resorption of root, open apex).
The medical doctors make use of these devices on different patients:
1. Women pregnancy, who must avoid the X ray
2. Children who may not tolerate the radiological film
3. Disabled people
4. Who have gag reflex.
Electronic devices are highly sensitive devices that can be used to accurately determine the location of the apical constriction. The use of electronic devices can reduce radiographic exposure for the patient, as the operator may need fewer radiographs to correctly determine the working length.
Electronic devices are user friendly, less time consuming and reliable in most of the clinical situations. It is important to note that electronic devices are not an absolute substitute for radiographs and should be used as an adjunct. However, it can be concluded that the electronic devices can be very useful in endodontic practice for length determination.
We presented above a comparison between different generations of electronic devices for determining the working lengths in root canal therapy, emphasize on the advantages and disadvantages of them. From my researching and my own medical practice I am sure that every dentist having such an electronic device in his dental surgery, will improve his work and performance.