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Effect of Different Methods of Heating Sodium Hypochlorite Irrigating Solution on the External Root Surface
Amr M Elhenawy1, Sybel M Moussa1, Mohamed A Alnakeeb2
1Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria 21527, Egypt.
Journal of Endodontics
|June 8, 2025
Summary
Heating sodium hypochlorite (NaOCl) irrigation solutions, whether intracanal or extracanal, significantly increases root surface temperatures. These temperature increases were found to be safe for surrounding periodontal tissues.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomedical Engineering
Background:
- Elevated temperatures of irrigants can enhance disinfection efficacy.
- Understanding root surface temperature changes is crucial for safety during endodontic procedures.
- 5.25% sodium hypochlorite (NaOCl) is a common endodontic irrigant.
Purpose of the Study:
- To investigate temperature variations on the external root surface of mandibular premolars.
- To compare temperature changes across coronal, middle, and apical root thirds.
- To evaluate the effects of intracanal and extracanal heating of 5.25% NaOCl.
Main Methods:
- Seventeen mandibular premolars were prepared using the Protaper Next rotary system.
- Thermocouples measured external root surface temperatures at coronal, middle, and apical thirds.
- Irrigation solutions were tested at room temperature, preheated to 50°C, and intracanal heated to 180°C.
Main Results:
- Both intracanal and extracanal heating significantly increased root surface temperatures compared to room temperature irrigation (P < .05).
- Intracanal heating led to higher temperatures in coronal and middle thirds versus the apical third (P < .05).
- Extracanal heating and room temperature irrigation showed higher temperatures in the coronal third compared to middle and apical thirds (P < .05).
Conclusions:
- Heating endodontic irrigation solutions, intracanal or extracanal, significantly elevates external root surface temperatures.
- Observed temperature increases on the external root surface remained below 10°C.
- The temperature changes recorded were deemed safe for periodontal tissues.
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