Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . so as to give freeaccess to the wire electrode. Before starting theionizing process it is best to assure oneself of thecorrect working of the current by bringing thetwo poles together for a moment; the moving ofthe needle of the milliamperemeter in the rightdirection acts as an indicator that the apparatusis in working order. The rubber dam having beenadjusted, the root canal is now flooded with a 1per cent saline solution—an minim syringeis useful for such purpose. The patient
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . so as to give freeaccess to the wire electrode. Before starting theionizing process it is best to assure oneself of thecorrect working of the current by bringing thetwo poles together for a moment; the moving ofthe needle of the milliamperemeter in the rightdirection acts as an indicator that the apparatusis in working order. The rubber dam having beenadjusted, the root canal is now flooded with a 1per cent saline solution—an minim syringeis useful for such purpose. The patient takes afirm hold of the negative electrode with his hand,which must not carry rings, bracelets, etc. Beforeintroducing the freshly flamed positive pole intothe canal the operator should see to it that theknife switch is open, and that the controller isset at zero. If the wire electrode fits the canal too loosely, afew fibers of cotton moistened with salt water are wrapped aboutit. The needle is introduced as near to the apex as possible,and the knife switch is closed. The controller is now very slowly. Fig. 121.—Minimsyringe for applyingsaline solution. 21 1 DISEASES OF THE DENTAL PULP turned on, and the patient is told to at once raise his hand whenhe feels the slightest sensation. The moving needle of the milli-amperemeter will indicate to the operator that tin* current isBowing in the right direction. When the patient raises his hand thecontroller is turned verj slightly back, left at this point for abouthalf a minute, and again very slowly turned forward until thepatient again responds, or until the point of tolerance is point the writer has termed the irritation point. A glanceat the milliamperemeter conveys to the operator the number ofmilliamperes employed. The operator now retails to his mindthe numerical constant 30, and quickly calculates the time of hisparticular < ase of electro-sterilization by <li\ iding 30 by the numberof milliamperes
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Keywords: ., bookcentury1900, bookdecade1920, bookiddiseasesofso, bookyear1922
