Ricardo Macedo1, Bram Verhaagen2, David Fernandez Rivas3, Michel Versluis2, Paul Wesselink4, Luc van der Sluis5. 1. Department of Cariology, Endodontology and Pedodontology, ACTA Academic Center for Dentistry Amsterdam, University of Amsterdam and VU University, Amsterdam, The Netherlands. Electronic address: r.macedo@acta.nl. 2. Physics of Fluids Group and MIRA Institute for Biomedical Technology and Technical Medicine and MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands. 3. Mesoscale Chemical Systems Group, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands. 4. Department of Cariology, Endodontology and Pedodontology, ACTA Academic Center for Dentistry Amsterdam, University of Amsterdam and VU University, Amsterdam, The Netherlands. 5. Center for Dentistry and Oral Hygiene, University Medical Center Groningen, Groningen, The Netherlands.
Abstract
INTRODUCTION: The aims of this study were to quantify and to visualize the possible occurrence of transient cavitation (bubble formation and implosion) during sonic and ultrasonic (UAI) activated irrigation. METHODS: The amount of cavitation generated around several endodontic instruments was measured by sonochemiluminescence dosimetry inside 4 root canal models of human dimensions and varying complexity. Furthermore, the spatial distribution of the sonochemiluminescence in the root canal was visualized with long-exposure photography. RESULTS: Instrument oscillation frequency, ultrasonic power, and file taper influenced the occurrence and amount of cavitation. In UAI, cavitation was distributed between the file and the wall extending beyond the file and inside lateral canals/isthmuses. In sonic activated irrigation, no cavitation was detected. CONCLUSIONS: Cavitation was shown to occur in UAI at clinically relevant ultrasonic power settings in both straight and curved canals but not around sonically oscillating instruments, driven at their highest frequency.
INTRODUCTION: The aims of this study were to quantify and to visualize the possible occurrence of transient cavitation (bubble formation and implosion) during sonic and ultrasonic (UAI) activated irrigation. METHODS: The amount of cavitation generated around several endodontic instruments was measured by sonochemiluminescence dosimetry inside 4 root canal models of human dimensions and varying complexity. Furthermore, the spatial distribution of the sonochemiluminescence in the root canal was visualized with long-exposure photography. RESULTS: Instrument oscillation frequency, ultrasonic power, and file taper influenced the occurrence and amount of cavitation. In UAI, cavitation was distributed between the file and the wall extending beyond the file and inside lateral canals/isthmuses. In sonic activated irrigation, no cavitation was detected. CONCLUSIONS: Cavitation was shown to occur in UAI at clinically relevant ultrasonic power settings in both straight and curved canals but not around sonically oscillating instruments, driven at their highest frequency.
Authors: Francine Cesario; Marco Antonio Hungaro Duarte; Jussaro Alves Duque; Murilo Priori Alcalde; Flaviana Bombarda de Andrade; Marcus Vinicius Reis So; Bruno Carvalho De Vasconcelos; Rodrigo Ricci Vivan Journal: J Conserv Dent Date: 2018 Jul-Aug