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200 OPERATIVE DENTISTRY
be effectually protected. Many caustics are not limited in their ac-
tion and when once applied on the dentine continue their destruc-
tion to the envelopment of the pulp. Arsenic trioxide is a notable
example of this.
Zinc Chloride is one of the oldest and most efficient remedies for
hypersensitive dentine. Its action is due to its affinity for water and
its coagulating properties upon albumen.
The Danger in its Use in deep-seated cavities is through the lib-
eration of hydrochloric acid, which causes pain in case of a nearly
exposed pulp. This effect may be modified by using it in a solution
of one part chloroform and four parts alcohol. Add the zinc crystals
to the proportion of five grains to the ounce. Clarify by adding a
drop of hydrochloric acid.
The Methods of Using Zinc Chloride are
First—Saturate a pellet of cotton with the above solution, place
in the cavity and evaporate with a draft of warm air from the warm
air syringe or chip blower.
Second—Mix a thin paste of zinc oxychloride cement. Paint the
sensitive dentine with this cement and cover with stopping or gutta-
percha. After a few days or weeks, often, excavation may be ac-
complished with little pain.
Caustic Potassa and Carbolic Acid, equal parts (Robinson's rem-
edy), often relieves sensitiveness of the dentine and is applied by
placing a pledget of cotton in the cavity, always with the rubber
dam in position to protect soft tissues.
Silver Nitrate may be employed to good effect upon exposed
surfaces of dentine in the posterior parts of the mouth, such as those
on the occlusal surface of molars due to abrasions, or exposed ce-
mentum. It reduces sensitiveness and by forming the albuminate
of silver it retards decay even so far, in some cases, as to render
the surfaces to which it has been applied immune to caries. On ac-
count of itS' discoloring effect its use is not permissible in parts ex-
posed to view.
Formaldehyde. Formaldehyde is a protoplasmic poison and is a
great desensitizer. The author called the attention of the profession
to this method at the World's Columbian Dental Congress in 1898
in a paper before that convention. However, its irritating effects
are sometimes injurious to the pulp and great care has to be exer-
cised in its use, particularly that there is not a near pulp exposure.
It is of advantage if the material can be so combined as to cause
a slow liberation of the formaldehyde, which materially lessens dan-
ger to the pulp and pain from its application.
200 OPERATIVE DENTISTRY
be effectually protected. Many caustics are not limited in their ac-
tion and when once applied on the dentine continue their destruc-
tion to the envelopment of the pulp. Arsenic trioxide is a notable
example of this.
Zinc Chloride is one of the oldest and most efficient remedies for
hypersensitive dentine. Its action is due to its affinity for water and
its coagulating properties upon albumen.
The Danger in its Use in deep-seated cavities is through the lib-
eration of hydrochloric acid, which causes pain in case of a nearly
exposed pulp. This effect may be modified by using it in a solution
of one part chloroform and four parts alcohol. Add the zinc crystals
to the proportion of five grains to the ounce. Clarify by adding a
drop of hydrochloric acid.
The Methods of Using Zinc Chloride are
First—Saturate a pellet of cotton with the above solution, place
in the cavity and evaporate with a draft of warm air from the warm
air syringe or chip blower.
Second—Mix a thin paste of zinc oxychloride cement. Paint the
sensitive dentine with this cement and cover with stopping or gutta-
percha. After a few days or weeks, often, excavation may be ac-
complished with little pain.
Caustic Potassa and Carbolic Acid, equal parts (Robinson's rem-
edy), often relieves sensitiveness of the dentine and is applied by
placing a pledget of cotton in the cavity, always with the rubber
dam in position to protect soft tissues.
Silver Nitrate may be employed to good effect upon exposed
surfaces of dentine in the posterior parts of the mouth, such as those
on the occlusal surface of molars due to abrasions, or exposed ce-
mentum. It reduces sensitiveness and by forming the albuminate
of silver it retards decay even so far, in some cases, as to render
the surfaces to which it has been applied immune to caries. On ac-
count of itS' discoloring effect its use is not permissible in parts ex-
posed to view.
Formaldehyde. Formaldehyde is a protoplasmic poison and is a
great desensitizer. The author called the attention of the profession
to this method at the World's Columbian Dental Congress in 1898
in a paper before that convention. However, its irritating effects
are sometimes injurious to the pulp and great care has to be exer-
cised in its use, particularly that there is not a near pulp exposure.
It is of advantage if the material can be so combined as to cause
a slow liberation of the formaldehyde, which materially lessens dan-
ger to the pulp and pain from its application.
