Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . Fig. 117.—Sponge hand electrode. near the negative pole. The blistering is the result of imperfectcontact between the skin and the metal electrode, thereby increas-ing the resistance of a small area to such an extent as to producehigh heat, i. e., an electric burn. The positive electrode to beintroduced into the tooth consists of a piece of iridio-platinum wireNo. 20 gauge, about one inch long and tapered to a delicate Fig. 118.—Sponge wrist electrode. The iridio-platinum allo
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . Fig. 117.—Sponge hand electrode. near the negative pole. The blistering is the result of imperfectcontact between the skin and the metal electrode, thereby increas-ing the resistance of a small area to such an extent as to producehigh heat, i. e., an electric burn. The positive electrode to beintroduced into the tooth consists of a piece of iridio-platinum wireNo. 20 gauge, about one inch long and tapered to a delicate Fig. 118.—Sponge wrist electrode. The iridio-platinum alloy possesses the necessary flexibility, whichis lacking in pure platinum. The point itself is ground blunt soas to avoid being caught when introduced into tortuous sizes of these points may be kept on hand. No other14 210 DISEASES OF THE DEA TAL Il LP metal should be employed for such purposes. To substitute theiridio-platinum point by zinc, copper, or any other metal with theview of aiding its therapeutic effects is not only useless bul itmarkedly interfere- with the action of electrolysis in the rela-tively small area of a root canal, or the re-ultant ions may discolorthe tooth. A long-handle electrode bolder, Insulated with hardrubber i^ essential to suitably unite the electrode w ith the conduct-ing cord. rldie holders may he of various types so as to give readyaccess to all parts of the oral cavity. Prom the foregoing descrip- 119. Long-handle electrode with iii(lio-|. iiiiiin point. to. I 20. Insulated
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Keywords: ., bookcentury1900, bookdecade1920, bookiddiseasesofso, bookyear1922
