30G: 0.30 mm: Red label and hub
27G: 0.40 mm: Yellow label and hub
25G: 0.50 mm: Green label and hub
A needle remains sterile for 5 years.
It is the threaded plastic part of the needle.
It constitutes the support for the cannula (the ground stainless steel tube) and enables the needle to be screwed onto and unscrewed from the syringe.
The external diameter of the tube is the same but the internal diameter of the tube of the XL needle is wider, which enables the dentist to exert less pressure when carrying out an injection.
The anaesthetic flow is broader and slower, which is more comfortable for the patient and makes anaesthesia gentler.
American needles have a thread which is suitable for inch thread syringes, while European needles have a thread which is suitable for metric thread syringes.
This is a secure injection system which protects the dentist and his or her assistant from risks of accidental needle-stick injuries thanks to its locking positions and avoids cross-contamination due to its disposable syringe body.