. Dental electro-therapeutics. uld always be covered with somematerial to prevent actual contact of the metal with thebody, such as lint or chamois leather or any absorbentmaterial, which must be free from chemical should not be used uncovered to apply electricityto the body because it is liable to cause pain and inflictburns or blisters on the surface of the skin, due to the electro-lytic action set up at the surface of contact. The indifferent electrode should consist of a flat pieceof metal about two inches in diameter to which is soldereda terminal in the centre for attach
. Dental electro-therapeutics. uld always be covered with somematerial to prevent actual contact of the metal with thebody, such as lint or chamois leather or any absorbentmaterial, which must be free from chemical should not be used uncovered to apply electricityto the body because it is liable to cause pain and inflictburns or blisters on the surface of the skin, due to the electro-lytic action set up at the surface of contact. The indifferent electrode should consist of a flat pieceof metal about two inches in diameter to which is soldereda terminal in the centre for attachment of the conducting 120 ELECTRO-PHYSICS cord. It shouldbe readily remova buckle to attacwrist indifferentelectrode clean,with warm waterapplied firmly to be covered with a pad of lint which caned and renewed. A leather strap withh it to the patients wrist completes theelectrode. It is essential to keep theIt should always be applied moistenedor a warm saline solution. It should bethe site of contact, and kept moist. Fig. 51. Indifferent electrode. Some operators prefer to apply the indifferent electrodenearer the site of the application of the active electrode,which is the electrode conveying the positive application of the current to parts of the oral cavity,when it is desired to place the indifferent electrode nearto the site of contact of the other electrode, one such as isshown in the illustration Fig. 51, invented by Dr. LewisJones should be placed under the chin and held in firmcontact with that surface. This electrode possesses theadvantage of being readily covered with a new clean coverfor each patient. It is made in sections which allow of anew cover being easily slipped on. Electrodes of thisdescription are a little awkward to manage at first butare the best of the kind for application to this part of thebodv. ELECTRODES 121 If the electrode is not large enough or if it does not makegood contact the current is liable to cause blisters to theskin at t
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