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The effect of ultrasonic post instrumentation on root surface temperature
Andrew S Huttula1, Patricia A Tordik, Glen Imamura
1Naval Postgraduate Dental School, Bethesda, Maryland, USA.
Journal of Endodontics
|October 24, 2006
Summary
Ultrasonic vibration during endodontic post removal significantly increases root surface temperature, especially without irrigation. Using water coolant during ultrasonic post removal is crucial for managing heat and protecting root structures.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomedical Engineering
Background:
- Cemented endodontic posts are common in restorative dentistry.
- Ultrasonic vibration is used for post removal, but its effect on root temperature is critical.
- Elevated root surface temperatures can potentially harm periodontal tissues.
Purpose of the Study:
- To measure root surface temperature changes during ultrasonic post removal.
- To evaluate the impact of irrigation (water coolant) on temperature changes.
- To compare temperature variations at different root locations.
Main Methods:
- Twenty-six extracted premolars were prepared, obturated, and had posts cemented.
- Thermocouples measured root surface temperature during 4-minute ultrasonic vibration.
- Teeth were tested with and without water irrigation.
- Two-way ANOVA analyzed the effects of irrigation and thermocouple location.
Main Results:
- Root surface temperatures were significantly higher (p < 0.001) when posts were removed dry.
- A trend showed higher temperatures at coronal locations without irrigation and apical locations with irrigation (p = 0.057).
- Irrigation significantly impacted measured external root surface temperature.
Conclusions:
- Irrigation is essential during ultrasonic post removal to mitigate excessive root surface temperature rise.
- Managing heat is critical for preserving periodontal health during endodontic procedures.
- This study highlights the importance of coolant use in ultrasonic procedures involving endodontic posts.
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