Selecting The Right Needle: Making The Right Choice For Local Anaesthesia

Needle selection is one of the most important — yet often overlooked — decisions in dental practice. Whether you're performing a mandibular block or a simple infiltration, the right needle makes all the difference for patient comfort and clinical accuracy.

Septoject — Sterile Siliconised Dental Needles by Septodont

What Influences Needle Selection?

Needle selection may be influenced by one or more of the following:

• What we learned in school
• What is available at the office
• Employer preferences
• What we think will be most comfortable for the patient

Key Insight: Needle selection should be based on two things: injection type and depth of penetration. Hundreds of studies over several decades have indicated that patients cannot tell the difference between 25-, 27-, and 30-gauge needles. It really is about technique!

Dental Needle Anatomy

The main components of the dental anaesthetic needle include the bevel, shank, hub, syringe adaptor, and cartridge penetration end. The syringe adaptor/hub complex is commonly referred to as the "hub".

Precision-engineered bevel for smooth, atraumatic tissue penetration

Dental Needle Length

Dental needles are available in three lengths: long, short, and ultra-short. From hub to tip:

Septoject available in 5 sizes: 25g Long, 27g Short, 27g Long, 30g Short, 30g Extra Short

Dental Needle Gauge

The gauge represents the diameter of the lumen. In dentistry, common gauges include 25, 27, and 30 — the larger the number, the smaller and thinner the gauge.

Each Septoject needle is individually packaged for sterility assurance

Dental Needle Bevel

The bevel is the slanted surface of a needle which creates the tip and facilitates non-traumatic entry into tissues. The orientation of the bevel should be toward the bone during injections close to the periosteum — this increases patient comfort and reduces trauma.

Septoject Advantage: Features a perfectly siliconised external needle surface and precision bevel design to facilitate smooth tissue penetration with minimal force — reducing pain perception for patients.

Metal Hub vs Plastic Hub

Septoject complete range — colour-coded for easy gauge identification

Special Considerations

When contact with bone is required prior to deposition, the contact should be gentle. A fishhook-type barb may form on the needle tip due to forceful bone contact — causing pain during withdrawal. Always use controlled, gentle technique.