Clinical studies of elektrovozoremontnij the tooth nerve

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In 1866 Magito proposed to use received induction coil current in order to determine hidden flowing tooth decay, and in 1891 Marshall (Marshall) and in 1896 Woodworth (Woodward) showed that using an electric current can be set whether to keep the pulp of the tooth or she died.
The beginning of XX century characterized by passion electroodontodiagnosis. Already the first authors have appreciated this method. Their findings (sometimes not informed) for many years found recognition of dentists around the world. It is interesting to indicate that even at the present time, some foreign authors consider them not lost its importance. They basically boil down to the following: 1) the teeth with intact enamel and normal pulp always react to irritation current; this reaction is very individual, but does not depend on the shape of electrodes; 2) the teeth with inflamed pulp react to less current than the teeth with normal pulp; 3) the pulpless teeth do not react to irritation shock; because the teeth are different people react differently to irritation current, suitable as control of the use of symmetric tooth.
To study the reaction of a tooth on electric irritation used mainly induction coil, and some researchers include the patient in the chain primary winding (the study was conducted constant intermittent shock), others - in the circuit of the secondary coil (the study was conducted by an alternating current). G. C. Burwasser (1907) was used both primary and secondary coil and no difference in the results of the research have not seen. The same point of view was also supported by the Maltese order Kovarskii (1908).
Also used and direct current and alternating current city network, and even currents d'arsonval.
The methodology of the study consisted in the following. One electrode, typically in the form of a metal cylinder (passive), the patient had in his hand. The second (active) electrode served any small diameter of the tool, the end of which is wrapped with cotton wool moistened with tap water; it was applied to the investigated tooth. The latter were covered with cotton rolls and dried. When determining excitability with telecoil the research started in the most remote from each other windings. For circuit and open circuit active electrode you have applied, then took up the study of the tooth. Constantly bringing together winding induction apparatus, the patient is offered when the feeling in the tooth to tell the doctor about it. The distance between the windings, as defined in millimeters, pointed the threshold of irritation. If control and intervention teeth reacted with equal distance between windings, it was considered a sign of a full clinical well-being. If the investigational tooth reacted with a larger distance between the windings than the control, this was quite sufficient for diagnosis of acute pulpitis (expected in acute pulpitis nerves "annoyed" and anxiety increased). If the reaction is investigated tooth appeared the more separated windings than were required for the control (i.e., at a higher voltage), it testified to the partial destruction of the pulp. No reaction at maximally separated windings, was a sign of pulp necrosis.
This technique, which is the best representatives of dentistry that time had high hopes, did not justify itself. Its main defect was the fact that about excitability judged not on the threshold current, and the distance between the windings induction coil.
We established that the resistance of tooth hard tissues varies widely not only between remotely located from each other stations, but on the same small area at different points, for example, on the same hill (top and SKAT) define areas with resistance in millions and hundreds of thousands Ohms. Especially small resistance have decayed tooth. Place the electrode in the area of the tooth with great resistance, we even with strongly shifted to each other windings, pass through the tooth very low current that will create the impression that there is no or a reduced reaction where there is actually no no pathology. Conversely, if significant damage to the pulp may accidentally place the electrode in the area of the tooth with sharply lower resistance and thus, even at very low voltage, skip through the tooth strong current, and get an idea of increased excitability where in fact the downgrade.
It is noteworthy that many of these facts were well known to the first dentists, engaged in the study of elektrovozoremontnij teeth, although a correct estimation they could not give.