Pressures produced in vitro during intraligamentary anaesthesia

Area of Science:

• Dentistry
• Biomedical Engineering

Background:

• Periodontal ligament injections are crucial for dental anesthesia.
• Accurate pressure delivery is essential for effective and safe injections.

Purpose of the Study:

• To compare the pressures generated by an Astra type aspirating syringe and a Ligmaject pressure syringe during periodontal ligament injections.
• To investigate the influence of clinician sex and injection technique on pressure delivery.

Main Methods:

• An in vitro study utilizing a pressure transducer (0-6.9 MPa) connected to a microcomputer.
• Thirty-five clinicians (3:2 male:female ratio) performed periodontal ligament injections with both syringe types.
• Peak and time-averaged pressures were recorded and analyzed.

Main Results:

• The pressure syringe produced significantly higher pressures (P < 0.01) than the aspirating syringe.
• Male operators generated significantly higher pressures with the aspirating syringe (P < 0.1).
• No significant sex difference was observed with the pressure syringe (P > 0.1).
• A multiple high-pressure technique with the pressure syringe yielded significantly higher pressures (P < 0.01) than a steady pressure technique.

Conclusions:

• Pressure syringes are capable of generating higher pressures than aspirating syringes for periodontal ligament injections.
• Clinician sex may influence pressure delivery with aspirating syringes.
• Injection technique significantly impacts pressure output with pressure syringes.