In vitro study on nanosecond-pulsed Q-switched Er:YAG laser-induced selective removal for caries dentin

Kondo, Sota; Hazama, Hisanao; Tanaka, Kenji; Kasakawa, Aya; Sekine, Shinichi; Akiyama, Shuzo; Awazu, Kunio

doi:10.1007/s41547-020-00106-7

Cited by 4 publications

(9 citation statements)

References 22 publications

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“…Two lasers: Q-switched Er:YAG laser (FLPM-90, Pantec Medical Laser, Ruggell, Liechtenstein) 16) and conventional Er:YAG laser (Erwin Adverl, JMMC, Kyoto, Japan) were used, and their performance was compared. Q-switched Er:YAG laser was irradiated at average power densities of 20, 40, and 60 W/cm 2 (Q-20 group, Q-40 group, Q-60 group, respectively) without water injection.…”

Section: Light Sourcesmentioning

confidence: 99%

“…Ultrashort pulse lasers with high output power have been introduced, showing promising results in terms of heat potential reduction and increase of ablation capacity. Among these, Q-switched lasers have been developed and proposed for hard tissue use [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

“…The Q-switching system is a way to control the oscillation of a laser and to obtain high output power and a short pulse width. The Q-switched Er:YAG laser equipped with a Q-switching system is an alternative to the conventional Er:YAG laser with the same wavelength (2.94 µm), but it oscillates at a shorter pulse (up to 100 ns) than the pulse width of conventional laser (150-350 µm) 16,17) . Recent experiments showed an optimal cutting capability of Q-switched laser, associated with a high selectivity when used in specific conditions 16) .…”

Section: Introductionmentioning

confidence: 99%

“…The Q-switched Er:YAG laser equipped with a Q-switching system is an alternative to the conventional Er:YAG laser with the same wavelength (2.94 µm), but it oscillates at a shorter pulse (up to 100 ns) than the pulse width of conventional laser (150-350 µm) 16,17) . Recent experiments showed an optimal cutting capability of Q-switched laser, associated with a high selectivity when used in specific conditions 16) . Furthermore, even without the use of water, it seems to effectively suppress the thermal effect, reducing overheating 16) .…”

Section: Introductionmentioning

confidence: 99%

“…Recent experiments showed an optimal cutting capability of Q-switched laser, associated with a high selectivity when used in specific conditions 16) . Furthermore, even without the use of water, it seems to effectively suppress the thermal effect, reducing overheating 16) . Although the Q-switched Er;YAG laser has shown these characteristics, there is no report on its interaction with resin filled after cavity formation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of <i>Q</i>-switched Er:YAG laser irradiation on bonding performance to dentin surface

et al. 2022

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The use of Q-switched erbium:yttrium-aluminum-garnet laser (Er:YAG laser), which have much less thermal effects than conventional Er:YAG lasers, has been proposed mainly in the medical field. The purpose of this study was to evaluate the bonding ability of dentin after Q-switched Er:YAG laser irradiation.The effects of dentin irradiation with Q-switched and conventional lasers were evaluated in terms of dentin morphology, roughness, hardness, elemental content, and resin bonding strength. Q-switched Er:YAG laser at average power densities of 20, 40, and 60 W/cm 2 and conventional Er:YAG laser at 909 W/cm 2 were used, and their performance was compared with that of the untreated group. Significant differences (p<0.05) were observed between 20 W/cm 2 and the other groups in term of surface roughness and surface hardness. The resin adhesion of the 20 W/cm 2 group was significantly higher than that of the other groups (p<0.05).

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Section: Light Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of <i>Q</i>-switched Er:YAG laser irradiation on bonding performance to dentin surface

et al. 2022

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Thermal damage and the prognostic evaluation of laser ablation of bone tissue—a review

Xiao,

Guo,

Wang

et al. 2023

Lasers Med Sci

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Mechanism of dentin hardness measurements using a dentin hardness measuring device with a light-emitting diode

Kondo,

Tomioka,

Fujimoto

et al. 2024

J. Biomed. Opt.

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Managing caries is imperative in a rapidly aging society. Current diagnoses use qualitative indices. However, a quantitative evaluation of hardness in a clinical setting may lead to more accurate diagnoses. Previously, hardness meter using indenter with light for tooth monitoring (HAMILTOM) was developed to quantitatively measure tooth hardness. Herein, the physical interpretation of dentin hardness measured using HAMILTOM and the dentin hardness measurement mechanism are discussed.Aim: This study evaluates the mechanism of dentin hardness measurements using HAMILTOM physically and compare the invasiveness to dentin by HAMILTOM with those using a dental probe for palpation.Approach: Eleven bovine dentin samples were used to create caries models. HAMILTOM measured the dark areas, and its indentations were observed using scanning electron microscopy. Also, its invasiveness was evaluated by comparing the results with those from dental probe palpation.Results: The indentation areas were smaller than the dark areas in HAMILTOM, which may be due to exuded water from the dentin sample and the elastic recovery of dentin sample. Additionally, the dental probe indentation was deeper than the HAMILTOM indentations. Conclusions:The results demonstrate that the indentation areas were smaller than the dark areas measured by HAMILTOM, which might contain the influence of exuded water and the deformation of dentin sample. Also, HAMILTOM is less invasive than dental probe palpation. In the future, HAMILTOM may become a standard hardness measuring method to diagnose root caries.

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In vitro study on nanosecond-pulsed Q-switched Er:YAG laser-induced selective removal for caries dentin

Cited by 4 publications

References 22 publications

Effect of <i>Q</i>-switched Er:YAG laser irradiation on bonding performance to dentin surface

Effect of <i>Q</i>-switched Er:YAG laser irradiation on bonding performance to dentin surface

Thermal damage and the prognostic evaluation of laser ablation of bone tissue—a review

Mechanism of dentin hardness measurements using a dentin hardness measuring device with a light-emitting diode

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