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DIAGNOSIS OF MOUTH AFFECTIONS. 181

brought about by moistening the powder in the tooth with a drop
of water, and the orifice of the cavity is immediately closed with
warm gutta percha ; also peroxide of sodium 50 per cent, solution
followed by application of a dilute acid, such as sulphuric hydro-
chlorine, or trichloracetic, all applied on asbestos fibre ; also
pyrozone, per cent, and 25 per cent, solutions ; also decompos-
5
ing chloride of magnesia or chloride of tin with peroxide of
hydrogen within the tooth. (See Cataphoresis.)
Herpes Zoster of Mouth and Gums.—An acute circumscribed
inflammatory affection, characterized by an eruption of vesicles
of herpes on a red, inflamed basis, the vesicles being disposed in
groups and follow the group of the adjacent nerve. The erup-
tion is preceded and accompanied by a very severe neuralgia of
the fifth nerve. The period of invasion (three days) is accom-
panied by a well-defined fever and other general symptoms. The
period of eruption begins on the third day, and lasts about three
weeks to one month, the pain being persistent. It is probably of
an infectious origin, and is due to a neuritis of the affected region
which leads to tropic changes.
Treatment.—Dr. Harlan recommends a palliative treatment,
which consists in placing cotton-wool between the cheek and
teeth to prevent friction, and on it an ointment consisting of
cocaine and morphine.
Merck's Bulletin gives the following. new treatment for herpes
zoster :
MIXTURE.
Extract gelsemium
JJ . )
r. J. , , , , > of each 4 grammes,
oodium sulpho-carbolate
J
Distilled water 90 grammes. M.
Sig. One teaspoonful every two hours.
At the same time five drops of the tincture of belladonna are
administered every two hours until a slight dryness of the pharynx
is experienced.
LOTION.
R . Lead acetate l
„ , ^ of each 4 grammes.
,
,
Powdered alum j
Distilled water .... 120 grammes. M.
Sig. Externally.