. Dental electro-therapeutics. Fig. 48.—The authors pyorrheaelectrodes. Fig. 49.—The authors root canalelectrodes. should be rounded, as sharp points increase the density ofthe current which makes it painful. The points are flexible(except zinc), which permits of them being bent to suitablecurves for different angles when required to pass to the RHEOSTAT FOR DIRECT CURRENT FROM MAIN 111 approximal surfaces of molars. The shanks of the pointsshould be insulated three-quarters of the length to preventthe current passing to the lips and cheeks adjoining thesite of application. (See Fig. 48.) For
. Dental electro-therapeutics. Fig. 48.—The authors pyorrheaelectrodes. Fig. 49.—The authors root canalelectrodes. should be rounded, as sharp points increase the density ofthe current which makes it painful. The points are flexible(except zinc), which permits of them being bent to suitablecurves for different angles when required to pass to the RHEOSTAT FOR DIRECT CURRENT FROM MAIN 111 approximal surfaces of molars. The shanks of the pointsshould be insulated three-quarters of the length to preventthe current passing to the lips and cheeks adjoining thesite of application. (See Fig. 48.) For root canals, electrodes of fine copper or platinumwire twisted into a coil at one end and straightened outfor varying lengths of half to one inch in length, the straightpart for insertion into the root canal, and the coil to receivethe end of a spear-shaped point attached to the ordinaryhandle, to hold it steadily in position when being used(Fig. 49). Iridio-platinum wire electrodes are best fortreating root canals. Copper
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