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After assembling the syringe, which of the following is the most important item to check before performing the injection.

Nitrous oxide-oxygen sedation has a positive effect on the heart due to the supplemental oxygen and sedative properties.

Excessive operator exposure to N2O may occur as a result of leaks from the anesthetic delivery system during administration.

Which of the following conditions contraindicates the use of N2O-O2 sedation?

How long is oxygen most often administered at the completion of sedation?

A _________________ aspiration can occur when a bevel is in contact with a vessel wall.  This is why some highly vascular areas require two aspirations.

Which of the following statements about needles is False?

During minimal sedation, patients are able to independently and continually maintain airways; however they respond slowly to tactile stimulation and verbal commands.

Topical anesthetic is most effective when applied to:

The site of penetration for the buccal injection is buccal and distal to the last mandibular molar.