. Dental electro-therapeutics. Fig. 45.—Hand electrode. Another form of indifferent electrode quite well adaptedfor ionic medication consists of a nickel-plated metal handlewhich the patient holds. This should have a moistenedsponge at the open end and should be covered with stock-inette or lint moistened with salt and water. It should notbe of brass or copper as sometimes made, and should be of ELECTRODES 109 the largest size displayed by makers. This form of electrodeis preferred by some patients, as they seem to like to holdon to something; the epidermis of the palm of the hand isthick and
. Dental electro-therapeutics. Fig. 45.—Hand electrode. Another form of indifferent electrode quite well adaptedfor ionic medication consists of a nickel-plated metal handlewhich the patient holds. This should have a moistenedsponge at the open end and should be covered with stock-inette or lint moistened with salt and water. It should notbe of brass or copper as sometimes made, and should be of ELECTRODES 109 the largest size displayed by makers. This form of electrodeis preferred by some patients, as they seem to like to holdon to something; the epidermis of the palm of the hand isthick and not usually sensitive to current of small amperagesuch as is usually recpiired for applications to periodontalmembrane. The chin electrode devised by the author consists of anickel-plated metallic plate which fits under the chin witha contact screw soldered to the middle and end pieces to. Fig. 46.—The authors chin electrode. receive an adjustable elastic strap which is intended to passover the head and hold the electrode firmly in place. Itshould be covered with a pad of lint next to the skin, andshould be moistened with salt water. This form of elec-trode for contact on the face is comfortable and usefulwhere it is desired to lessen the resistance by having theelectrodes in close proximity. Active electrodes convey the current to the site of appli-cation. They consist of an insulated rubber or ebonyhandle with an attachment screw at one end to connect 110 BATTERY ACCESSORIES the conducting cord to, the other end should consist of aninterchanging screw piece to receive the particular appli-cator required; the electrodes to fit these handles shouldbe of platinum, zinc, or copper, and shaped according to Fig. 47.—The authors electrode hand piece. the requirement of the operation; for pyorrhea pockets orgingival trough, spear-shaped metallic points of the metalsmentio
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