A Comparative Study on Compositional Changes and Knoop Hardness Measurement of the Cavity Floor Prepared by Er:YAG Laser Irradiation and Mechanical Bur Cavity

2003 ◽  
Vol 21 (1) ◽  
pp. 29-33 ◽  
Author(s):  
Mozammal Hossain ◽  
Yukio Nakamura ◽  
Yoshiko Murakami ◽  
Yoshishige Yamada ◽  
Koukichi Matsumoto
Keyword(s):  
Comparative Study ◽  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Hardness Measurement ◽  
Knoop Hardness ◽  
Compositional Changes ◽  
Cavity Floor

Atomic analysis and knoop hardness measurement of the cavity floor prepared by Er,Cr:YSGG laser irradiation in vitro

2003 ◽  
Vol 30 (5) ◽  
pp. 515-521 ◽  
Author(s):  
M. Hossain ◽  
Y. Nakamura ◽  
Y. Tamaki ◽  
Y. Yamada ◽  
Y. Murakami ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Hardness Measurement ◽  
Knoop Hardness ◽  
Atomic Analysis ◽  
Cavity Floor

Compositional Changes of Enamel and Dentine after Er:YAG Laser Irradiation

2010 ◽  
Vol 93-94 ◽  
pp. 529-532 ◽  
Author(s):  
Attapol Choeysuppaket ◽  
Artorn Pokaipisit ◽  
Pichet Limsuwan
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Raman Intensity ◽  
Human Teeth ◽  
Human Enamel ◽  
Fourier Transform Raman Spectroscopy ◽  
Compositional Changes ◽  
Fourier Transform Raman ◽  
Inorganic Components ◽  
Ft Raman

The aim of the present study was to investigate the organic and inorganic compositions of enamel and dentine after Er:YAG laser irradiation using Fourier-transform Raman spectroscopy (FT-Raman). The enamel and dentine of extracted human teeth were irradiated by Er:YAG laser at an energy density of 29.7 J/cm2. The organic and inorganic components were evaluated from Raman spectra of untreated and laser-treated of extracted human teeth. The results showed that the Raman intensity ratio of the carbonate peak (1067 cm-1) to the phosphate peak (957 cm-1) and the organic peak (2940 cm-1) to the phosphate peak of enamel and dentine decreased after laser irradiation. Therefore, laser treatment can reduce the organic and inorganic components of human enamel and dentine.

Comparative Study of Dentine Permeability after Apicectomy and Surface Treatment with 9.6 µm TEA CO2and Er:YAG Laser Irradiation

2004 ◽  
Vol 22 (2) ◽  
pp. 129-139 ◽  
Author(s):  
S. Gouw-Soares ◽  
A. Stabholz ◽  
J.L. Lage-Marques ◽  
D.M. Zezell ◽  
E.B. Groth ◽  
...  
Keyword(s):  
Comparative Study ◽  
Surface Treatment ◽  
Laser Irradiation ◽  
Er:Yag Laser

Effects of the Er:YAG Laser Irradiation on Titanium Implant Materials and Contaminated Implant Abutment Surfaces

2003 ◽  
Vol 21 (1) ◽  
pp. 7-17 ◽  
Author(s):  
Tomoko Matsuyama ◽  
Akira Aoki ◽  
Shigeru Oda ◽  
Takayuki Yoneyama ◽  
Isao Ishikawa
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Titanium Implant ◽  
Implant Materials ◽  
Implant Abutment

Surface temperature during cavity preparation on human tooth by Er:YAG laser irradiation

CIRP Annals ◽  
2011 ◽  
Vol 60 (1) ◽  
pp. 555-558 ◽  
Author(s):  
T. Furumoto ◽  
T. Ueda ◽  
A. Kasai ◽  
A. Hosokawa
Keyword(s):  
Surface Temperature ◽  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Human Tooth ◽  
Cavity Preparation

scholarly journals Er:YAG laser-induced damage to a dental composite in simulated clinical scenarios for inadvertent irradiation: an in vitro study

2021 ◽  
Author(s):  
Katharina Kuhn ◽  
Carmen U. Schmid ◽  
Ralph G. Luthardt ◽  
Heike Rudolph ◽  
Rolf Diebolder
Keyword(s):  
Laser Irradiation ◽  
Laser Fluence ◽  
Ablation Threshold ◽  
Er:Yag Laser ◽  
In Vitro Study ◽  
Vitro Study ◽  
Crater Diameter ◽  
Clinical Scenarios ◽  
Laser Induced Damage

AbstractInadvertent Er:YAG laser irradiation occurs in dentistry and may harm restorative materials in teeth. The aim of this in vitro study was to quantify Er:YAG laser-induced damage to a nanohybrid composite in simulated clinical scenarios for inadvertent direct and indirect (reflection) laser irradiation. The simulation was performed by varying the output energy (OE;direct˃indirect) reaching the specimen and the operating distance (OD;direct˂indirect). Composite specimens were irradiated by an Er:YAG laser. The ablation threshold was determined and clinically relevant parameters were applied (n = 6 for each OE/OD combination) for direct (OE: 570 mJ/OD: 10 mm, OE: 190 mJ/OD: 10 mm) and indirect irradiation (OE: 466 mJ/OD: 15 mm, OE: 57 mJ/OD: 15 mm, OE: 155 mJ/OD: 15 mm, OE: 19 mJ/OD: 15 mm). The extent of damage in the form of craters was evaluated using a laser scanning microscope (LSM) and a conventional light microscope (LM). The ablation threshold was determined to be 2.6 J/cm2. The crater diameter showed the highest value (LM: 1075 ± 18 µm/LSM: 1082 ± 17 µm) for indirect irradiation (reflectant:dental mirror) (OE: 466 mJ/OD: 15 mm). The crater depth showed the highest and comparable value for direct (OE: 570 mJ/OD: 10 mm; LSM: 89 ± 2 µm) and indirect irradiation (OE: 466 mJ/OD: 15 mm; LSM: 90 ± 4 µm). For each OD, the crater diameter, depth, and volume increased with higher laser fluence. However, the OD—and thus the laser spot diameter—also had an enlarging effect. Thus, indirect irradiation (reflectant:dental mirror) with only 47% of the laser fluence of direct irradiation led to a larger diameter and a comparable depth. The three-dimensional extent of the crater was large enough to cause roughening, which may lead to plaque accumulation and encourage caries, gingivitis, and periodontitis under clinical conditions. Clinicians should be aware that reflected irradiation can still create such craters.

scholarly journals Human Dental Enamel and Dentin Structural Effects after Er:yag Laser Irradiation

2014 ◽  
Vol 15 (3) ◽  
pp. 283-287 ◽  
Author(s):  
Mateus Rodrigues Tonetto ◽  
Marcelo Ferrarezi de Andrade ◽  
Shelon Cristina Souza Pinto ◽  
Darlon Martins Lima ◽  
José Roberto Cury Saad ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Soft Tissues ◽  
Er:Yag Laser ◽  
Laser System ◽  
Dental Enamel ◽  
Target Tissue ◽  
Structural Effects ◽  
Ablation Process ◽  
Dental Tissues ◽  
Laser Systems

ABSTRACT Ideally projected to be applied on soft tissues, infrared lasers were improved by restorative dentistry to be used in hard dental tissues cavity preparations — namely enamel and dentin. This paper evidentiates the relevant aspects of infrared Erbium laser's action mechanism and its effects, and characterizes the different effects deriving from the laser's beams emission. The criteria for use and selection of optimal parameters for the correct application of laser systems and influence of supporting factors on the process, such as water amount and its presence in the ablation process, protection exerted by the plasma shielding and structural factors, which are indispensable in dental tissues cavity preparation related to restorative technique, are subordinated to optical modifications caused by the interaction of the energy dissipated by these laser light emission systems in the targeted tissue substrate. Clinical relevance Differences in the action of infrared Erbium laser system in regard to the nature of the ablation process and variations on the morphological aspects observed in the superficial structure of the target tissue irradiated, may be correlated to the structural optical modifications of the substrate produced by an interaction of the energy propagated by laser systems. How to cite this article Lima DM, Tonetto MR, de Mendonça AAM, Elossais AA, Saad JRC, de Andrade MF, Pinto SCS, Bandéca MC. Human Dental Enamel and Dentin Structural Effects after Er:yag Laser Irradiation. J Contemp Dent Pract 2014;15(3):283-287.

scholarly journals Laser Irradiation of a Bio-Waste Derived Carbon Unlocks Performance Enhancement in Secondary Lithium Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3183
Author(s):  
Mariangela Curcio ◽  
Sergio Brutti ◽  
Lorenzo Caripoti ◽  
Angela De Bonis ◽  
Roberto Teghil
Keyword(s):  
Laser Irradiation ◽  
Performance Enhancement ◽  
Laser Source ◽  
Thermal Treatments ◽  
Carbon Particles ◽  
Nanosecond Pulsed Laser ◽  
Negative Electrodes ◽  
Before And After ◽  
Hazelnut Shell ◽  
Compositional Changes

Pyrolyzed carbons from bio-waste sources are renewable nanomaterials for sustainable negative electrodes in Li- and Na-ion batteries. Here, carbon derived from a hazelnut shell has been obtained by hydrothermal processing of the bio-waste followed by thermal treatments and laser irradiation in liquid. A non-focused nanosecond pulsed laser source has been used to irradiate pyrolyzed carbon particles suspended in acetonitrile to modify the surface and morphology. Morphological, structural, and compositional changes have been investigated by microscopy, spectroscopy, and diffraction to compare the materials properties after thermal treatments as well as before and after the irradiation. Laser irradiation in acetonitrile induces remarkable alteration in the nanomorphology, increase in the surface area and nitrogen enrichment of the carbon surfaces. These materials alterations are beneficial for the electrochemical performance in lithium half cells as proved by galvanostatic cycling at room temperature.

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