Nanosecond Nd:YAG laser on dental enamel: compositional analysis
by X-ray fluorescence

Antunes, Augusto Celso; Salvador, V.L.R.; Scapin, Marcos A.; Rossi, Wagner de; Zezéll, Denise Maria

doi:10.1002/lapl.200410181

Cited by 28 publications

(24 citation statements)

References 19 publications

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“…The literature show data regarding the Nd:YAG laser capacity of increasing the dental enamel caries resistance [4][5][6][7][8][9][10]. On the other hand there is no data clarifying if the involuntary irradiation with this system, which exposes the enamel to much lower irradiation parameters, confers the same advantages to the Nd:YAG laser irradiated enamel tissue when specific parameters are applied.…”

Section: Introductionmentioning

confidence: 90%

Enamel caries resistance accidentally irradiated by the Nd:YAG laser

et al. 2007

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When the carious tissue is eliminated either by conventional methods (with burs) or with lasers, the risk of accidentally damage the surface of adjacent teeth may occur, which hypothetically could lead to a more susceptible surface for caries formation. This in vitro study aims to evaluate the caries resistance of the dental enamel surface irradiated by the Nd:YAG laser applied in conditions simulating accidental exposition. Thirteen third molars were used in this study. The experimental groups were: G1: sound control and control + carious; G2: contact Nd:YAG laser at 0.75, 1, 2, or 3 W; 10 Hz; 3 sec (27, 35, 71, and 106 J/cm 2 ); G3: same parameters from G2 + caries artificial induction through the demineralization and demineralization (DES/RE) dynamic model. The caries resistance analysis was evaluated by the superficial morphological aspect through SEM images and also by Ca/P proportion through energy dispersive X-ray spectroscopy (EDX). The micrograph images showed that the Nd:YAG laser changed the normalmorphology of the enamel prisms resulting in a melted and re-solidified surface intensified with the power increase. Significant statistical differences were observed applying the Kruskal-Wallis statistical test (p ≤ 0.01) among the Nd:YAG laser irradiated groups and the control with caries regarding the Ca/P proportion. As an exception, this was not observed when 3 W; 10 Hz; 3 sec; 106 J/cm 2 was applied and posteriously submitted to a cariogenic challenge. The results indicate that the Nd:YAG laser accidental irradiation at low power settings did not represent risks to the enamel caries resistance.

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Section: Introductionmentioning

confidence: 90%

Enamel caries resistance accidentally irradiated by the Nd:YAG laser

et al. 2007

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“…Laser systems are under into investigation and in common clinical use as an efficient tool for medicine, dentistry and physiology. Considering dentistry treat ments, light can be associated to promote pain relief [1,2], healing stimulation, through LASERs bioe stimulation capacity [3][4][5][6][7][8][9][10], bacteria reduction effects [11], caries, calculus and materials removal [12][13][14], and, to accelerate chemical reaction of restorative and bleaching materials [15][16][17], indeed, 1 The article is published in the original.…”

Section: Introductionmentioning

confidence: 99%

The effect of low level laser therapy in different wavelengths in the treatment of oral mucositis—proposal for extra-oral implementation

et al. 2009

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The oral mucositis is the most frequent acute oral complication resulting from antineoplastic treatment and may worsen the clinical condition of the patient and interfere with his/her quality of life. This study aimed to comparatively evaluate, from a clinical point of view, the effect of Laser Therapy λ660 nm (wavelength of the red Laser) and λ830 nm (wavelength of the infrared Laser), at extra oral points, in remis sion of severity of oral mucositis and pain associated with it in pediatric oncological patients undergoing che motherapy with the anticancer drug methotrexate, noting which of the two wavelength is the most appropri ate to this new technique. The sample consisted of 13 patients placed at random in each group and subjected to sessions of Low Level Laser Therapy, at pre determined extra oral points for five consecutive days, starting at the beginning of the observation of mucositis injuries. It became possible to note that from the group of patients in the group of Laser λ830 nm (n = 6; 46.15%), four (n = 4; 66.67%) of these patients had remission of injuries to grade 0 (WHO), and as for pain, five patients (n = 5; 83.33%) showed no painful symptoms for mucositis injuries. In the Laser λ660 nm group (n = 7; 53.85%), only two patients (n = 2; 28.57%) achieved a regression of lesions to grade 0 (WHO), while four patients (n = 4; 57.14%) had no pain. So, the extra oral application of Laser Therapy was effective in treating injuries of oral mucositis in the patients treated; and Laser Therapy in the infrared spectrum (λ830 nm) was more effective in the treatment of oral mucositis inju ries compared to the red spectrum (λ660 nm), which can be explained by the greater power of penetration of infrared rays, acting in a more expressive way in deeper places.

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“…The laser as a replacement for mechanical tools in many hard tissue applications is still strongly debated. One of the strongest limitations is the slow material removal rate, and, in several cases, unacceptable collateral damage, usually caused by overheating [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Selective ablation of dental enamel and dentin using femtosecond laser pulses

et al. 2007

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The study of the interaction of intense laser light with matter, as well as transient response of atoms and molecules is very appropriated because of the laser energy concentration in a femtosecond optical pulses. The fundamental problem to be solved is to find tools and techniques which allow us to observe and manipulate on a femtosecond time scale the photonics events on and into the matter. Six third human extracted molars were exposed to a femtosecond Ti:Sapphire Q-switched and mode locked laser (Libra-S, Coherent, Palo Alto, CA, USA), emitting pulses with 70 fs width, radiation wavelength of 801 nm, at a constant pulse repetition rate of 1 KHz. The laser was operated at different power levels (70 to 400 mW) with constant exposition time of 10 seconds, at focused and defocused mode. Enamel and dentin surfaces were evaluated concerned ablation rate and morphological aspects under scanning electron microscopic. The results in this present experiment suggest that at the focused mode and under higher average power, enamel tissues present microcavities with higher depth and very precise edges, but, while dentin shows a larger melt-flushing, lower depth and melting and solidification aspect. In conclusion, it is possible to choose hard or soft ablation, under lower and higher average power, respectively, revealing different aspects of dental enamel and dentin, depending on the average power, fluence and distance from the focal point of the ultra-short pulse laser on the tooth surface.

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Nanosecond Nd:YAG laser on dental enamel: compositional analysis by X-ray fluorescence

Cited by 28 publications

References 19 publications

Enamel caries resistance accidentally irradiated by the Nd:YAG laser

Enamel caries resistance accidentally irradiated by the Nd:YAG laser

The effect of low level laser therapy in different wavelengths in the treatment of oral mucositis—proposal for extra-oral implementation

Selective ablation of dental enamel and dentin using femtosecond laser pulses

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