. Dental electro-therapeutics. f a flat pieceof metal about two inches in diameter to which is soldereda terminal in the centre for attachment of the conductingcord. It should be covered with a pad of lint which canbe readily removed and renewed. A leather strap with abuckle to attach it to the patients wrist completes thewrist indifferent electrode. It is essential to keep the elec- ELECTRODES 107 trode clean. It should always be applied moistened withwarm water or a warm saline solution. It should be appliedfirmly to the site of contact and kept moist. Some operators prefer to apply the indi
. Dental electro-therapeutics. f a flat pieceof metal about two inches in diameter to which is soldereda terminal in the centre for attachment of the conductingcord. It should be covered with a pad of lint which canbe readily removed and renewed. A leather strap with abuckle to attach it to the patients wrist completes thewrist indifferent electrode. It is essential to keep the elec- ELECTRODES 107 trode clean. It should always be applied moistened withwarm water or a warm saline solution. It should be appliedfirmly to the site of contact and kept moist. Some operators prefer to apply the indifferent electrodenearer the site of the application of the active 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. 43), invented by Dr. LewisJones, should be placed under the chin and held in firm con-tact with that surface. This electrode possesses the advan-. Pig. 43.—Indifferent electrode. tage of being readily covered with a new clean cover foreach patient. It is made in sections which allow of a newcover being easily slipped on. Electrodes of this descriptionare a little awkward to manage at first but are very goodfor application to this part of the body. If the electrode is not large enough or if it does not makegood contact the current is liable to cause blisters to theskin at the site of contact of the indifferent electrode, evenwhen a small current is passed. In the case of the handelectrode, if the metal is of small size and not grasped firmlyby the patient, a small, hard, white blister about the size 108 BATTERY ACCESSORIES of the heat! of a large pin may appear at some point in thepalm of the hand, attended with some discomfort to thepatient, the skin dies at this point and the mark will onlydisappear when the skin is removed a long time after. Toobviate this occurrence place a carbon electrode, c
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