Multiple choice

To ensure a reasonable shelf life what is added to the L.A cartridges that contain a vasoconstrictor?

  1. Sodium bisulphate

  2. Sodium sulphate

  3. Phenylethylamine

  4. Thymol
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A Correct answer
Explanation

Sodium bisulphate is added to dental cartridges that contain vasoconstrictor to enhance an adequate shelf life. In the presence of oxygen, the sodium bisulphate is converted to sodium bisulphate, thus sparing oxidation of the vasoconstrictor.

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