Calculus removal on a root cement surface by ultrashort laser pulses

Kraft, Johan F.; Vestentoft, Kasper; Christensen, B.H.; Løvschall, Henrik; Balling, P.

doi:10.1016/j.apsusc.2007.07.198

Cited by 17 publications

(11 citation statements)

References 19 publications

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“…In the case of ultrafast laser ablation, plasma generation within a small focal volume is the dominate ablation mechanism , where nonlinear absorption and multiphoton ionization are induced by applying high laser intensity (10 11 W/cm 2 ) in the focus volume . In the picosecond to femtosecond regime, the pulse duration is much shorter than thermal diffusion; hence, the ablation is confined within the focal volume.…”

Section: Introductionmentioning

confidence: 99%

Influence of environmental conditions in bovine bone ablation by ultrafast laser

Aljekhedab

Zhang

Haugen

et al. 2019

Journal of Biophotonics

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Ultrafast lasers are promising tools for surgical applications requiring precise tissue cutting. Shallow ablation depth and slow rate as well as collateral damage are common barriers limiting the use of laser in clinical applications. Localized cooling with water and/or air jet is known to reduce collateral thermal damage. We studied the influence of environmental conditions including air, compressed air flow, still water and water jet on ablation depth, ablation rate and surface morphology on bovine bone samples with an 800 nm femtosecond laser. At 15 J/cm2, no thermal effect was observed by electron microscopy and Raman spectroscopy. The experimental results indicate that environmental conditions play a significant role in laser ablation. The deepest cavity and highest ablation rate were achieved under the compressed air flow condition, which is attributed to debris removal during the ablation process. The shallowest ablation depth and lowest ablation rates were associated with water flushing. For surface morphology, smooth surface and the absence of microcracks were observed under air flow conditions, while rougher surfaces and minor microcracks were observed under other conditions. These results suggest that ultrafast ablation of bone can be more efficient and with better surface qualities if assisted with blowing air jet.

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Section: Introductionmentioning

confidence: 99%

Influence of environmental conditions in bovine bone ablation by ultrafast laser

Aljekhedab

Zhang

Haugen

et al. 2019

Journal of Biophotonics

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“…They demonstrated the possibility of selective control of refractive index change and application in the preferential removal of portions of dental hard tissues. Kraft et al used ultra-short laser pulses for calculus removal on a root cement surface [3]. Daskalova et al demonstrated that by selecting suitable parameters one can obtain efficient dentin surface preparation without evidence of thermal damage, i.e., with minimized heat affected zones and reduced collateral damage [4].Niemz MH demonstrated the advantages and limitations using ultra-short pulsed lasers in dentistry [5].…”

Section: Introductionmentioning

confidence: 99%

Preliminary experiments of a miniature robotic system for tooth ablation using ultra-short pulsed lasers

Wang

et al. 2013

2013 IEEE/RSJ International Conference on Intelligent Robots and Systems

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As a preliminary step to achieve a long-term goal of developing an automatic dental preparation system for clinical operations, we design and build a miniature robotic system which can manipulate a laser beam to move in three dimensional spaces to remove hard tissue from a target tooth. The dental preparation requires the robotic system to own high accuracy, high ablation speed and small size. A 2D galvanometer scanners module is integrated to meet the requirement of a high moving speed of the laser focus. A closed-loop system based on a miniature-sized voice-coil motor and a grating ruler are developed to realize the accurate control of the focus. The overall size of the developed prototype is 108mm×56mm×43mm, which is small enough to be used in close proximity to a patient's mouth. The prototype has been tested by using two different kinds of laser generators, i.e. È a nanosecond laser and a picosecond laser. The experiment results show that the robotic system can provide high moving speed of 1000mm/s with good shape accuracy. From the results, we found that nanosecond laser beam can be controlled to ablate zirconia and aluminum, but not suitable to ablate tooth because of tissue carbonization. By selecting suitable parameters of the picosecond laser generator, a target tooth could be ablated to produce a cylinder shape without carbonization. Limitations of the prototype are identified according to the experiment results.

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“…These lasers are typically used in the femtosecondpulse regime around 800 nm [10,11]. However, a 95-femtosecond Ti:sapphire laser, frequency doubled to 400 nm, has been reported to remove sound enamel at $1 J/cm 2 [12].…”

Section: Introductionmentioning

confidence: 99%

“…However, a 95-femtosecond Ti:sapphire laser, frequency doubled to 400 nm, has been reported to remove sound enamel at $1 J/cm 2 [12]. Selective removal of dental calculus using these lasers at 800 nm has been reported with a removal rate of $0.15 mm/ pulse at a peak fluence of $1 J/cm 2 [10]. The mechanism is different for femtosecond pulses compared to the 100-nanosecond pulse durations of the frequency-doubled alexandrite laser where the former is plasma mediated and depends on absorption due to multiphoton ionization and inverse bremsstrahlung absorption in the plasma.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the optimum beam shape and fluence for selective ablation of dental calculus at λ = 400 nm

2010

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Calculus removal on a root cement surface by ultrashort laser pulses

Cited by 17 publications

References 19 publications

Influence of environmental conditions in bovine bone ablation by ultrafast laser

Influence of environmental conditions in bovine bone ablation by ultrafast laser

Preliminary experiments of a miniature robotic system for tooth ablation using ultra-short pulsed lasers

Investigation into the optimum beam shape and fluence for selective ablation of dental calculus at λ = 400 nm

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