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DIAGNOSIS OF MOUTH AFFECTIONS. 175

shorter duration and less acute in character than that from an
inflamed dental pulp; the pain of sensitive dentine soon subsides
on the removal of the irritating cause.
Treatment.—Apply obtunding agents, as chloride of zinc,
chloroform and aconite equal parts, carvacrol, oil of cloves,
oil of cedar, oil of eucalyptus, tannin combined with glycerine
or camphor, chloral, camphorized ether, oxide of calcium, car-
bonate of sodium, menthol, thymol, sesquichloride of chromium,
sulphate of morphine and gum camphor equal parts, ethylate of
sodium, carbonate of potash and glycerine, carbolized potash,
campho-phenique ; also chloride of ethyl, phenate of cocaine,
tropacocaine, peroxide of sodium, vapocaine, eucaine, chlore-
tone, etc. The cataphoric current with warm saline solutions of
cocaine, or the solution of cocaine with electrozone, or cocaine
dissolved in a ten per cent, solution of chloride of sodium. The
application of chloretone in the form of a saturated ethereal solu-
tion has given very satisfactory results ; also the ethereal solu-
tion of the salt of cocaine known as vapocaine. Ottolengui's
method : Apply the rubberdam, dry cavity with bibulous paper,
then insert a pledget of cotton saturated with absolute alcohol,
then apply intermittingly a series of blasts of hot air to produce
evaporation, until parts become whitened or thoroughly dry, then
throw on a continuous spray of ether. A jet of nitrous oxide
gas directed into the cavity of the tooth by a piece of tubing
;
also the vapor of alcohol, produced by heating the alcohol in a
metal apparatus, and conducting the vapor into the cavity through
a fine metal tube, have also been employed for the relief of the
pain arising from hypersensitive dentine. The application of
cocaine and alcohol by electrolysis has also given satisfactory
results. (See Therapeutics of Electricity.)
Abrasion of the Teeth is indicated by a loss of structure, due
to friction, to such an extent at times as to destroy the entire
crowns.
Treatment.—Gold caps or partial crowns, either in the form
of ferrules or contour fillings, or fillings of other metals, will
often arrest the process of abrasion, and render much worn
teeth useful organs. Also the insertion of artificial posterior