What size bubble is considered "normal" in a new dental cartridge?

In a new dental cartridge, a bubble size of 1-2 mm is considered "normal" and indicates proper function and handling of the cartridge. This small air bubble allows for an appropriate amount of liquid within the cartridge and does not interfere with the delivery of the anesthetic solution.

If the bubble were to be 0 mm, it could suggest overfilling or a potential problem with the cartridge that might lead to less accurate dosing of the anesthetic. A bubble size of 2-3 mm, while potentially still acceptable, pushes the boundary of what is typically regarded as normal and may prompt further inspection. Bubbles larger than 3 mm could indicate significant issues, such as possible contamination or improper sealing, which can compromise the effectiveness of the anesthesia.

Thus, recognizing a 1-2 mm bubble as normal helps dental professionals ensure the reliability and safety of their anesthetic delivery during procedures.