Which preservative is used in dental cartridges?
local anesthesia, dental cartridges, dental hygiene exam prep

Which preservative is used in dental cartridges?

Which preservative is used in dental cartridges?

(A.) Sodium bisulfite
(B.) Sodium chloride
(C.) Sodium bisulfate
(D.) Methylparaben

local anesthesia, dental cartridges, dental hygiene exam prep
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Answer: (A.) Sodium bisulfite

Sodium bisulfite (with an ”i”) is the antioxidant for vasoconstrictors. Some patients can be allergic to this substance, and a plain solution should be used if sulfite allergy is a concern. This chemical is also used to preserve food and other types of medication.

Sodium bisulfate (with an ”a”) is a different compound although it is spelled very similarly. It is used in metal finishing and cleaning products.

Sodium chloride is added to a dental cartridge to make the solution isotonic with body tissues.

Methylparaben prevents the growth of bacteria but is no longer added in single-use dental cartridges.

Other components of the dental cartridge include local anesthetic, vasoconstrictor, distilled water, and nitrogen gas.

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Written by
Claire Jeong, RDH, MS
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