Power density and external temperature of laser-treated root canals

Area of Science:

• Endodontics
• Laser Dentistry
• Biomedical Engineering

Background:

• Pulpal tissue removal is essential in endodontic therapy.
• Minimizing thermal damage to surrounding tooth structures is critical during laser treatments.
• Previous studies have explored laser parameters for dental applications, but specific settings for pulpal tissue removal with minimal external heating require further investigation.

Purpose of the Study:

• To determine optimal argon laser power and time parameters for effective pulpal tissue removal.
• To ensure that laser application does not cause excessive external tooth temperature elevation.
• To establish safe laser operating conditions for endodontic procedures.

Main Methods:

• Utilized an argon laser system to target pulpal tissue in extracted teeth.
• Measured external tooth surface temperatures at the cemento-enamel junction (CEJ) and root apex using thermistors.
• Tested different laser power settings (1W and 2W) with a consistent pulse duration (0.1 sec) and interval (1 sec).

Main Results:

• A 1W argon laser setting with 0.1 sec pulse duration resulted in a mean temperature increase of 0.89°C at the CEJ and 2.04°C at the apex.
• A 2W argon laser setting with 0.1 sec pulse duration led to a mean temperature increase of 1.58°C at the CEJ and 2.59°C at the apex.
• Both tested parameters demonstrated minimal external temperature elevation, staying within safe limits.

Conclusions:

• Argon laser settings of 1W or 2W with a 0.1-second pulse duration are effective for pulpal tissue removal.
• These parameters prevent excessive external tooth temperature increases, ensuring procedural safety.
• The findings support the use of specific argon laser configurations in endodontic treatments.