Question 1

What is a dental syringe used for?

Accepted Answer

A dental syringe is used to inject local anaesthetic from a pre-filled cartridge before dental procedures such as fillings, root canal treatment and extractions.

Question 2

What is an aspirating syringe?

Accepted Answer

An aspirating syringe lets the dentist draw back slightly before injecting to check whether the needle tip is inside a blood vessel. If blood appears in the cartridge, the needle is repositioned.

Question 3

What is the difference between a self-aspirating and an aspirating syringe?

Accepted Answer

A standard aspirating syringe uses a harpoon in the cartridge stopper, and the dentist pulls back on the thumb ring to aspirate. A self-aspirating syringe has no harpoon and creates negative pressure automatically when thumb pressure is released, with less risk of moving the needle.

Question 4

What is the difference between an aspirating and a non-aspirating syringe?

Accepted Answer

An aspirating syringe can check for blood before injection; a non-aspirating syringe cannot. Aspirating syringes are generally preferred for safer local anaesthesia.

Question 5

What does blood in the syringe after aspiration mean?

Accepted Answer

Blood in the cartridge after aspiration, a positive aspiration, means the needle tip is in a blood vessel. The needle should be withdrawn slightly and repositioned, and aspiration repeated before injecting.

Question 6

Which needle is used for an inferior alveolar nerve block?

Accepted Answer

A long dental needle, typically 27G and about 32 to 35 mm, is commonly used for an inferior alveolar nerve block, because it reaches the target depth and gives reliable aspiration.

Question 7

What size cartridge does a dental syringe take?

Accepted Answer

Most dental cartridge syringes take 1.8 ml cartridges, and some also accept 1.7 ml cartridges. Check the product page for each syringe.

Question 8

Can a dental syringe be reused?

Accepted Answer

The metal syringe can be reused after cleaning and autoclaving. The needle and cartridge are single-use and must be discarded after each patient.

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Dental Syringes and Needles for Local Anaesthesia

Parts of a Dental Aspirating Syringe