Fluid Dynamics of Ultrasonic Irrigation in Simulated Root Canals

DOI 28 References
  • ISOBE Ryoko
    Department of Endodontology, Kyushu University Hospital
  • YOSHIMINE Yoshito
    Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Kyushu University Faculty of Dental Science
  • MATSUMOTO Himeka
    Department of Endodontology, Kyushu University Hospital
  • USHIJIMA Kan
    Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Kyushu University Faculty of Dental Science
  • SAKATA Atsunobu
    Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Kyushu University Faculty of Dental Science
  • SATO Hiromi
    Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Kyushu University Faculty of Dental Science
  • NISHIHARA Masaharu
    Nishihara Dental Clinic
  • AKAMINE Akifumi
    Department of Endodontology and Operative Dentistry, Division of Oral Rehabilitation, Kyushu University Faculty of Dental Science

Bibliographic Information

Other Title
  • 模擬根管内での超音波による根管洗浄時の流れの観察

Search this article

Abstract

Passive ultrasonic irrigation (PUI) is used to reduce bacteria within the root canal. Although biophysical forces such as microstreaming and cavitation may play an important role in PUI, the details of these mechanisms have not been elucidated. The aim of this study was to clarify the involvement of biophysical forces for PUI using a high-speed camera. Files of different sizes (#15, #20, #25, #30, and #35) were immersed in free water, and the displacement amplitude of the oscillating files was measured under different ultrasonic intensities. In addition, the cavitation bubbles around the files were observed, and the fluid flow in the apical region was evaluated using glass-bead tracers. Thinner ultrasonic file and higher ultrasonic power resulted in a higher amplitude of the oscillating file in free water. Cavitation bubbles were observed only around the tip and anti-node of a vibrating file in a simulated canal. Active fluid flow was found within a region of approx. 1 mm under the file tip. When the file was placed 5 mm short of the bottom, the fluid flow was relatively slow in the apical region even at a high power. In conclusion, ultrasonic activation of the irrigant using a thin file that is set at a near-apical position at low ultrasonic intensity might be recommended for effective PUI.

Journal

References(28)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top