Synchronized delivery of Er:YAG-laser pulses into water studied by a laser beam transmission probe for enhanced endodontic treatment

Gregorčič, Peter; Lukač, Nejc; Možina, Janez; Jezeršek, Matija

doi:10.1007/s00339-016-9970-5

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…In this study, we analyzed a copper (Cu) plate in a sodium chloride (NaCl) aqueous solution and investigated the effect of repeated irradiation at a xed position on the spectral line intensity of ablated species (Cu) and dissolved species (Na). The bubble collapse time was simultaneously measured with a laserbeam-transmission probe (LBTP) technique [58][59][60][61][62][63] and the correlation between the spectral line intensity and the bubble collapse time was conrmed. We evaluated the capability of bubble collapse time as a parameter for the normalization of spectral line intensity obtained for the repeated irradiation.…”

Section: Introductionmentioning

confidence: 99%

Effect of repeated irradiation on laser-induced breakdown spectroscopy of copper immersed in a sodium chloride aqueous solution and normalization with bubble collapse time

Matsumoto,

Shimazu,

Yae

et al. 2023

J. Anal. At. Spectrom.

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Section: Introductionmentioning

confidence: 99%

Effect of repeated irradiation on laser-induced breakdown spectroscopy of copper immersed in a sodium chloride aqueous solution and normalization with bubble collapse time

Matsumoto,

Shimazu,

Yae

et al. 2023

J. Anal. At. Spectrom.

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“…The SWEEPS technique consists of delivering a properly timed second laser pulse during the collapse phase of the primary bubble generated by the first laser pulse. The expansion of the second cavitation bubble speeds up the contraction of the first cavitation bubble, resulting in an intense collapse accompanied by the emission of shock waves [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

In Vitro Assessment of SWEEPS and Antimicrobial Photodynamic Therapy Alone or in Combination for Eradicating Enterococcus faecalis Biofilm in Root Canals

Shahi Ardakani,

Afrasiabi,

Sarraf

et al. 2023

Pharmaceutics

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Objectives: This study investigates the efficacy of antimicrobial photodynamic therapy (aPDT) using riboflavin and a blue diode laser (BDL), combined with shock wave-enhanced emission photoacoustic streaming (SWEEPS), against Enterococcus faecalis. Materials and Methods: A total of 48 extracted single-rooted human teeth were used. The root canals were instrumented, sealed at their apices, had the smear layer removed, and then underwent autoclave sterilization. Subsequently, each canal was inoculated with E. faecalis bacterial suspension and allowed to incubate for ten days. After confirming the presence of biofilms through scanning electron microscopy (SEM) in three teeth, the remaining teeth were randomly allocated into nine groups, each containing five teeth: control, 5.25% sodium hypochlorite (NaOCl), BDL, SWEEPS + normal saline, SWEEPS + NaOCl, riboflavin, riboflavin + SWEEPS, riboflavin + BDL, and riboflavin + BDL + SWEEPS. After the treatment, the numbers of colony-forming units (CFUs)/mL were calculated. The data were analysed using one-way ANOVA followed by Tukey’s test for comparisons. Results: All groups, with the exception of the BDL group, exhibited a significant reduction in E. faecalis CFU/mL when compared to the control group (p < 0.001). The difference in CFU/mL value between riboflavin + BDL + SWEEPS and riboflavin + SWEEPS was significant (p = 0.029), whereas there was no significant difference between riboflavin + BDL + SWEEPS and riboflavin + BDL (p = 0.397). Moreover, there was no statistically significant difference between the riboflavin + SWEEPS group and the riboflavin + BDL group (p = 0.893). Conclusions: The results demonstrated that combining the SWEEPS technique with riboflavin as a photosensitizer activated by BDL in aPDT effectively reduced the presence of E. faecalis in root canals.

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“…For this reason, a SWEEPS (Shock Wave Enhanced Emission Photoacoustic Streaming) technique has been developed, as a solution for improving the efficacy of LAI in narrow endodontic cavities [13,20,22–24]. The SWEEPS shock wave enhancing technique consists of delivering a properly timed second laser pulse during the collapse phase of the primary bubble generated by a first laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Bubble Oscillations During Laser‐Activated Irrigation of Root Canals and Method of Improvement

Lukač

Jezeršek

2020

Lasers Surg Med

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Background and Objectives: Laser-activated irrigation of dental root canals is being increasingly used as its efficacy has been shown to be superior compared with conventional techniques. The method is based on laser-initiated localized fluid evaporation and subsequent rapid bubble expansions and collapses, inducing microfluid flow throughout the entire volume of the cavity. The irrigation efficacy can be further improved if optimally delayed "SWEEPS" double laser pulses are delivered into the canal. This study aims to show that the irrigation efficacy, as measured by the induced pressure within the canal, is related to the double pulse delay, with the maximal pressure generated at an optimal delay. The second aim is to find a method of determining the optimal delay for different cavity dimensions and/or laser parameters. Study Design/Materials and Methods: Experiments were made in transparent models of root canals where Er:YAG laser (λ = 2.94 μm, pulse duration t p = 25 or 50 microseconds, and pulse energies up to E L = 40 mJ) was used with a combination of cylindrical and conical fiber-tip geometries (diameters 400 and 600 µm). Highspeed photography (60,000 fps) and average pressure measurements inside the canal were used for process characterization. Results: The results show that a pressure amplification of more than 1.5 times occurs if the laser pulse delay approximately coincides with the bubble oscillation time. Correlations between normalized oscillation time and canal diameter for a wide range of laser pulse energies (R 2 = 0.96) and between the average pressure within the canal and the bubble oscillation periods (R 2 = 0.90) were found. A relationship between the bubble oscillation time and the diameter of the treated cavity was found depending on the bubble oscillation time in an infinite fluid reservoir. Conclusions: The bubble oscillation time within a constrained volume can be determined based on the known oscillation time in infinite space, which offers a fast and simple solution for optimization of the laser parameters. These findings enable determination of optimal conditions for shock wave generation, and improvement of root canal irrigation at the same dose of laser energy input, leading to improved treatment efficacy and safety. Lasers Surg. Med.

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Synchronized delivery of Er:YAG-laser pulses into water studied by a laser beam transmission probe for enhanced endodontic treatment

Cited by 14 publications

References 19 publications

Effect of repeated irradiation on laser-induced breakdown spectroscopy of copper immersed in a sodium chloride aqueous solution and normalization with bubble collapse time

Effect of repeated irradiation on laser-induced breakdown spectroscopy of copper immersed in a sodium chloride aqueous solution and normalization with bubble collapse time

In Vitro Assessment of SWEEPS and Antimicrobial Photodynamic Therapy Alone or in Combination for Eradicating Enterococcus faecalis Biofilm in Root Canals

Characteristics of Bubble Oscillations During Laser‐Activated Irrigation of Root Canals and Method of Improvement

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