. Dental electro-therapeutics. radiatefrom them (see Density, p. 73). Lewis Jones, in describingdiffusion of current in the body, says, The path of a cur-rent between two electrodes placed upon the body surfaceis not to be marked out simply by drawing direct lines fromone to the other, for the whole of the conducting tissues ELECTROLYTIC EFFECT 229 between the electrodes help to provide a passage for thecurrent, which spreads out from beneath the positiveelectrode, becoming less and less dense as it occupies awider and wider sectional area of the conductor, and againgrows denser as its lines o
. Dental electro-therapeutics. radiatefrom them (see Density, p. 73). Lewis Jones, in describingdiffusion of current in the body, says, The path of a cur-rent between two electrodes placed upon the body surfaceis not to be marked out simply by drawing direct lines fromone to the other, for the whole of the conducting tissues ELECTROLYTIC EFFECT 229 between the electrodes help to provide a passage for thecurrent, which spreads out from beneath the positiveelectrode, becoming less and less dense as it occupies awider and wider sectional area of the conductor, and againgrows denser as its lines of passage once more gathertogether to reach the negative electrode. According tothis description of the lines of current a positive electrodeapplied to periodontal membrane in the incisor regionwould show divergence of direction something after thelines of the diagram. With a small spear-shaped electrode,such as indicated on the diagram, the density of currentis greatest at the very end, and radiations of current take Fig. 131. <—Electrode Lines of current diffusion about a positive electrode placed inperiodontal tissue. place in all directions from the surface of the electrode,which is brought in contact with the moistened of such small area and cross-section, intensifythe density as already stated (see p. 74); for this reasona very small current strength produces an effect on thetissues equal to that produced by a very much greatercurrent strength applied with electrodes of large area, but,of course, only acts on a much smaller surface. A con-tinuous current passing into the tissues from an electrodewhich measures 2 sq. mm. concentrates the flow of currentfrom its surface to an extent which makes it possible tomedicate or stimulate the tissues more perfectly (in atissue of such small resistance to current as periodontal 230 ELECTRO-THERAPEUTICS tissue) with a current strength of only 2 ma. than woulda flat electrode of 2000 sq. mm. (applied to the surf
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