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Exploring morphometric transformations in temperature-sensitive NiTi instruments alongside real-time intracanal
Amre R Atmeh1, Taher Al Omari2, Abdullah F AlQifari3
1Hamdan Bin Mohammed College of Dental Medicine (HBMCDM), Mohammed Bin Rashid University of Medicine and Health Sciences (MBRU), Dubai, United Arab Emirates.
International Endodontic Journal
|May 28, 2024
Summary
Nickel-titanium (NiTi) endodontic instruments show varied shape changes with temperature. Intracanal temperatures stabilize below irrigation solution temperatures, emphasizing the need to consider irrigation temperature in in vitro testing.
Area of Science:
- Endodontics
- Materials Science
- Biomedical Engineering
Background:
- Nickel-titanium (NiTi) instruments are crucial in endodontic treatments.
- Understanding their thermomechanical properties is vital for clinical success.
- Previous research has not fully elucidated the in vivo temperature dynamics during root canal treatment.
Purpose of the Study:
- To investigate the morphometric changes of three temperature-sensitive NiTi instruments (XP-Endo Shaper, Finisher, Finisher-R) at varying temperatures.
- To perform a real-time in vivo analysis of intracanal temperature fluctuations during root canal procedures.
Main Methods:
- Morphometric analysis of NiTi instruments heated from 22°C to 45°C using digital imaging.
- Real-time in vivo measurement of intracanal temperatures in human molars using K-type thermocouple probes.
- Recording intraoral and intracanal temperatures after irrigation with solutions at 22°C and 45°C.
Main Results:
- XP-Endo Shaper, Finisher, and Finisher-R instruments exhibited distinct shape transformations starting between 26.9°C and 31.5°C.
- Full transformation resulted in length reductions of 0.43mm to 1.15mm.
- Intracanal temperatures stabilized around 33°C regardless of initial irrigation solution temperature (22°C or 45°C).
Conclusions:
- NiTi instruments display temperature-dependent morphometric changes.
- Intracanal temperature equilibrium is reached below the temperature of the irrigation solution.
- In vitro evaluations of endodontic instruments should account for irrigation solution temperature effects.
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