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552 DENTAL MEDICINE.
For Aphthous Stomatitis.
R . Salicylate of soda 20 parts
Distilled water 100 parts dissolve.
SiGNA.— Paint the inflamed parts five or six times a day, particularly after
meals. The mouth should previously be well rinsed out with tepid
water.
SODII SULPHIS—SULPHITE OF SODA.
Formula.—^z.^O^+'jUf).
Derivation.—Sulphite of Soda is prepared by passing sulphur-
ous acid into a solution of carbonate of soda, and evaporating
free from air. The sulphurous acid unites with the soda of the
carbonate, to form the sulphite of soda, and the carbonic acid
escapes. On cooling, the salt crystallizes in white prismatic
crystals, and should be kept well stoppered, as it changes on ex-
posure into sulphate of soda.
Medical Properties and Jetton.—Sulphite of soda is a disinfectant
and deodorizer, and its action and uses are similar to those of the
other sulphites, hyposulphites and sulphurous acid.
Dose.—Of sulphite of soda, gr. xv to three times a day.
.5ji
Dental Uses.—Sulphite of soda is sometimes employed in the
form of a lotion for aphthous sore mouth due to a parasitic vege-
table -, also in ulcerous stomatitis, gangrenous stomatitis, and all
suppurative affections of mucous membrane, especially when
they are sustained by zymotic influences or invisible organisms.
Dr. E. C. Kirk has successfully employed sulphite of soda in
combination with boracic acid, for bleaching discolored teeth.
(See Formula.) His method is as follows :
Having adjusted the rubber dam to the tooth to be treated, and
one adjoining it on each side, the cavity of decay is cleansed of
all debris and the root filled with gold or gutta percha for one-
half its length. The powder, composed of sulphite of soda and
boracic acid, is packed into the remaining portion of the pulp
canal and cavity of decay, leaving just sufficient space to insert a
temporary filling of gutta percha or Hill's Stopping. After the
powder has been properly packed, a drop of water is permitted to
fall upon it from a drop-tube or a pellet of cotton wrapped
around a broach, the object being to dampen the powder, not to