. Dental electro-therapeutics. m or steelshould be introduced into the canal to as near the apicalforamen as it will go, but should not pass through it intothe periodontal tissue. To this, contact should be madewith the anode from the continuous current, by holding-it in position; the current should be gradually turned onand 3 to 5 ma. passed. for five minutes. This will im-pregnate the walls of the tooth pulp canal with ions ofzinc and ions will also pass through the foramen and render 272 ELECTRO-THERAPEUTICS the tract aseptic. In teeth with more than one root anelectrode must be introduced
. Dental electro-therapeutics. m or steelshould be introduced into the canal to as near the apicalforamen as it will go, but should not pass through it intothe periodontal tissue. To this, contact should be madewith the anode from the continuous current, by holding-it in position; the current should be gradually turned onand 3 to 5 ma. passed. for five minutes. This will im-pregnate the walls of the tooth pulp canal with ions ofzinc and ions will also pass through the foramen and render 272 ELECTRO-THERAPEUTICS the tract aseptic. In teeth with more than one root anelectrode must be introduced into each root and joined inproper contact, where they meet in the cavity or outsidethe tooth; the current should then be applied to these asbefore. The action of the current is to permeate the hard tissuewalls with antiseptic ions in a manner quite impossibleby osmosis; furthermore, the ions remain as a permanentantiseptic. The ionic effect is sure because the current doesnot conduct without this electrolytic effect. Fig. 141. Premolar with electrodes in position for ionization of roots. I have known cases in which it has been impossible toseal the canal without the rapid formation of gases andpain in twenty-four hours, to yield to ionic medication withzinc ions after a single treatment. Miss W., a doctors daughter, had a dead central incisorwhich could not be sealed for twelve hours without causingpain. The attempt had been made many times by herdentist, who sent her to me. The canal appeared treatment was given with zinc ions from zinc chloridefor eight minutes with 5 ma. current, and the canal sealedtemporarily. A week later zinc ions were again introducedinto the canal as a precautionary measure and the root TREATMENT OF PERIODONTITIS 273 permanently filled. This was done three years ago. Therehas been no recurrence of the inflammatory condition,which was doubtless a septic infection of the periodontalmembrane caused by bacteria in the root canal. Periodontitis f
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