研究目的
To analyze the effects of pulse energy, pulse frequency, and laser tip diameter on intracanal vapor bubble kinetics and periapical pressure generation during LAI with Er:YAG laser.
研究成果
In LAI using Er:YAG laser, the intracanal vapor bubble count, velocity, and maximum diameter increased with pulse frequency. The tip diameter and pulse energy influenced only certain parameters of the vapor bubble kinetics. The pressure generated outside the apical foramen also increased with tip diameter, pulse energy, and pulse frequency. Thus, pulse frequency was the single factor that significantly affected all the examined parameters of vapor bubble kinetics, together with the periapical pressure.
研究不足
The study does not directly measure cleaning efficacy. The plastic canals could differ from real canals in terms of frictional resistance that could affect irrigant flow and bubble kinetics.
1：Experimental Design and Method Selection:
The study used a plastic root canal model filled with distilled water to simulate the root canal environment. LAI was performed using an Er:YAG laser with varying pulse energies, frequencies, and tip diameters.
2：Sample Selection and Data Sources:
A plastic pipette tip modified to an apical diameter of
3：50 mm with a 6% taper and 20 mm in length was used as the root canal model. List of Experimental Equipment and Materials:
Er:YAG laser (Erwin AdvErL, model MEY-1-A; Morita Manufacturing), high-speed camera (VW-9000; Keyence), pressure sensor (AP-12S; Keyence), and DIPP-Motion V software (version 1.1.29; DITECT Corporation).
4：29; DITECT Corporation). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The root canal was filled with distilled water and activated for 5 sec using Er:YAG laser with the end of the laser tip fixed at 15 mm from the bottom of the root canal model. Videos were captured with a high-speed camera at 50x magnification, 1/2000 shutter speed and 250 frames per second.
5：Data Analysis Methods:
The videos were analyzed for mean vapor bubble count, maximum diameter, and velocity using DIPP-Motion V software. Pressure generated outside the apical foramen was measured with a pressure sensor.
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