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https://www.readbyqxmd.com/read/28641206/efficacy-of-surgical-laser-therapy-in-the-management-of-oral-pigmented-lesions-a-systematic-review
#1
Tariq Abduljabbar, Fahim Vohra, Zohaib Akram, Siti Mariam Ab Ghani, Nawwaf Al-Hamoudi, Fawad Javed
BACKGROUND: Oral pigmentation, especially in the gingiva poses esthetic problems. Laser therapy has been widely used for cosmetic therapy in dentistry. The aim of the present study was to systematically review the efficacy of surgical laser therapy (SLT) in the management of oral pigmented lesions (OPL). MATERIALS AND METHODS: The addressed focused question was "Is SLT effective in the management of OPL?" Databases (MEDLINE via PubMed; EMBASE; Cochrane Central Register of Controlled Trials and Cochrane Oral Health Group Trials Register databases) were searched from 1970 up to and including February 2017...
June 15, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28621453/the-pinhole-method-using-an-erbium-yag-laser-for-the-treatment-of-papular-acne-scars
#2
Sang Ju Lee, Jae Min Kim, Young Koo Kim, Seong Jun Seo, Kui Young Park
Papular acne scars are skin-colored or hypopigmented, soft and elevated lesions of the chin and trunk. Papular scars are one of the most difficult acne scars to treat. Herein, we reported two patients with papular acne scars on the chin that were successfully treated by the pinhole method using an Erbium (ER):YAG laser. Good cosmetic results were achieved in both patients. The side effects included mild, intra-, and post-procedural pain and erythema that resolved spontaneously within 2 weeks. The pinhole method with an Er:YAG laser could potentially be used as a safe and effective treatment for papular acne scars...
June 16, 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/28611487/athermal-synchronization-of-laser-source-with-wdm-filter-in-a-silicon-photonics-platform
#3
Nanxi Li, Zhan Su, Purnawirman, E Salih Magden, Christopher V Poulton, Alfonso Ruocco, Neetesh Singh, Matthew J Byrd, Jonathan D B Bradley, Gerald Leake, Michael R Watts
In an optical interconnect circuit, microring resonators (MRRs) are commonly used in wavelength division multiplexing systems. To make the MRR and laser synchronized, the resonance wavelength of the MRR needs to be thermally controlled, and the power consumption becomes significant with a high-channel count. Here, we demonstrate an athermally synchronized rare-earth-doped laser and MRR. The laser comprises a Si3N4 based cavity covered with erbium-doped Al2O3 to provide gain. The low thermo-optic coefficient of Al2O3 and Si3N4 and the comparable thermal shift of the effective index in the laser and microring cross-sections enable lasing and resonance wavelength synchronization over a wide range of temperatures...
May 22, 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/28598190/paediatric-laser-dentistry-part-2-hard-tissue-laser-applications
#4
G Olivi, C Caprioglio, M Olivi, M D Genovese
Erbium lasers can provide effective and minimally invasive caries removal in children. The bonding phase remains a critic step as well as the choice of material. Glass ionomers exhibits lower bonding properties in laser irradiated teeth compared to the conventional method or to composite and resin modified glass ionomer. Laser can also provide effective decontamination and coagulation effects in vital and non vital pulp therapy of primary teeth, improving and simplifying the cleaning and disinfecting steps.
June 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28569843/5-6%C3%A2-%C3%A2-w-monolithic-fiber-laser-at-3-55%C3%A2-%C3%A2-%C3%AE-m
#5
Frédéric Maes, Vincent Fortin, Martin Bernier, Réal Vallée
We report, to the best of our knowledge, the first monolithic erbium-doped fluorozirconate fiber laser bounded by two fiber Bragg gratings (FBGs) operating at 3.55 μm. Its output power and total optical efficiency are 5.6 W and 26.4% respectively, the highest ever achieved at this wavelength from a fiber laser. The monolithic design of the cavity also increases its stability and prevents fiber tip damage which has limited prior demonstrations to a maximum output power of 1.5 W. This Letter also studies the performances of the laser cavity for various output FBG reflectivities and presents numerical modeling results exhibiting remarkable agreement with experimental results...
June 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28561064/turbulence-hierarchy-in-a-random-fibre-laser
#6
Iván R Roa González, Bismarck C Lima, Pablo I R Pincheira, Arthur A Brum, Antônio M S Macêdo, Giovani L Vasconcelos, Leonardo de S Menezes, Ernesto P Raposo, Anderson S L Gomes, Raman Kashyap
Turbulence is a challenging feature common to a wide range of complex phenomena. Random fibre lasers are a special class of lasers in which the feedback arises from multiple scattering in a one-dimensional disordered cavity-less medium. Here we report on statistical signatures of turbulence in the distribution of intensity fluctuations in a continuous-wave-pumped erbium-based random fibre laser, with random Bragg grating scatterers. The distribution of intensity fluctuations in an extensive data set exhibits three qualitatively distinct behaviours: a Gaussian regime below threshold, a mixture of two distributions with exponentially decaying tails near the threshold and a mixture of distributions with stretched-exponential tails above threshold...
May 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28527844/evaluation-of-various-pretreatments-to-fiber-post-on-the-push-out-bond-strength-of-root-canal-dentin
#7
Ömer Kırmalı, Özlem Üstün, Alper Kapdan, Alper Kuştarcı
INTRODUCTION: The aim of this in vitro study was to compare the effect of different pretreatments (fiber post) with the laser-activated irrigation (LAI) technique (for removal of the smear layer) on root canal dentin in terms of push-out bond strength (PBS) in a fiber post. METHODS: Fifty freshly extracted mandibular single-rooted premolars were prepared, and LAI was applied to all roots (17% EDTA was 5 mL for 120 seconds with an erbium, chromium:yttrium-scandium-gallium-garnet laser [0...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28518180/the-effects-of-laser-with-different-parameters-and-crosshatching-on-fibroblast-adhesion-and-proliferation-to-implant-surfaces
#8
Hakki Çelebi, Pembegül Uyar Arpacı, Ilhami Çelik, Serhan Akman
PURPOSE: To compare the adhesion and proliferation effect of HGF-1 cells on pure titanium disks when the surfaces are unprocessed (machined surfaces after slicing) or modified with a laser. MATERIALS AND METHODS: Twenty-eight titanium disks were divided into four groups. Three surface topographies were created using an erbium fiber laser: group 1 (unidirectional application [no crosshatch]), group 2 (crosshatching in two directions), and group 3 (crosshatching in three directions)...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28514344/-erbium-laser-application-for-oral-surgery-in-patients-with-platelet-hemostatic-disorders
#9
E V Makarova, S V Tarasenko, A L Melikyan, A V Ponomarenko
Hemostatic disorders are typically associated with prolonged bleeding after or during surgical procedures. The aim of the study was to increase the efficiency of oral surgery in these patients using erbium laser. Selected 46 patients receiving oral surgery were randomly divided in 2 groups: 43 patients with thrombocytopenia, trombocytemia and other platelet disorders treated with erbium laser and a control group of 43 patients without concomitant pathology determined for conventional surgical treatment. No postoperative bleeding was seen in group 1...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#10
R Nalcaci, B Temel, S Çokakoğlu, H Türkkahraman, S Üsümez
AIM: To evaluate the effects of laser etching on the shear bond strengths (SBS) and failure modes of brackets bonded to fluorosed enamel. MATERIALS AND METHODS: This in vitro study included 34 fluorosed and 34 nonfluorosed teeth. Teeth were divided into four subgroups according to the etching procedure: Group (A) normal enamel etched with 37% phosphoric acid for 15 s, Group (B) nonfluorosed enamel etched with erbium:yttrium aluminum garnet (Er: YAG) laser for 15 s, Group (C) fluorosed enamel etched with 37% phosphoric acid for 30 s, Group (D) fluorosed enamel etched with Er: YAG laser for 30 s...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28512669/combined-fractional-treatment-of-acne-scars-involving-non-ablative-1-550-nm-erbium-glass-laser-and-micro-needling-radiofrequency-a-16-week-prospective-randomized-split-face-study
#11
Hyuck Hoon Kwon, Hae Young Park, Sun Chul Choi, Youin Bae, Chanhee Kang, Jae Yoon Jung, Gyeong-Hun Park
An optimized therapeutic regimen involving a non-ablative fractionated laser or radiofrequency therapy for acne scars has not yet been established. To evaluate whether the combination of a non-ablative fractional laser (NAF) and fractional micro-needling radiofrequency (FMR) has clinical advantages for the treatment of atrophic acne scars compared with NAF alone, a 16-week prospective, randomized split-face study was performed. Each facial side of a patient was treated with 3 sessions of either NAF with FMR or NAF alone, with a 4-week interval between each session...
May 17, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/28468427/200-fs-mode-locked-erbium-doped-fiber-laser-by-using-mechanically-exfoliated-mos-sub-2-sub-saturable-absorber-onto-d-shaped-optical-fiber
#12
Eduardo J Aiub, David Steinberg, Eunézio A Thoroh de Souza, Lúcia A M Saito
For the first time, we demonstrated the fabrication of mechanically exfoliated molybdenum disulfide (MoS<sub>2</sub>) samples deposited onto a D-shaped optical fiber. The MoS<sub>2</sub> exfoliated flakes were deposited onto a stacked of 1.2 µm PVA (polyvinyl alcohol) and 300 nm PMMA (polymethyl methacrylate) layers and then transferred directly onto a side polished surface of D-shaped optical fiber with polishing length of 17 mm and no distance from the fiber core. The sample exhibited a high polarization performance as a polarizer with relative polarization extinction ratio of 97...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28463280/comparative-assessment-of-erbium-fiber-ring-lasers-and-reflective-soa-linear-lasers-for-fiber-bragg-grating-dynamic-strain-sensing
#13
Heming Wei, Sridhar Krishnaswamy
Fiber Bragg grating (FBG) dynamic strain sensors using both an erbium-based fiber ring laser configuration and a reflective semiconductor optical amplifier (RSOA)-based linear laser configuration are investigated theoretically and experimentally. Fiber laser models are first presented to analyze the output characteristics of both fiber laser configurations when the FBG sensor is subjected to dynamic strains at high frequencies. Due to differences in the transition times of erbium and the semiconductor (InP/InGaAsP), erbium-doped fiber amplifier (EDFA)- and RSOA-based fiber lasers exhibit different responses and regimes of stability when the FBG is subjected to dynamic strains...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28454157/wavelength-division-multiplexed-light-source-monolithically-integrated-on-a-silicon-photonics-platform
#14
P Purnawirman, Nanxi Li, E Salih Magden, Gurpreet Singh, Michele Moresco, Thomas N Adam, Gerard Leake, Douglas Coolbaugh, Jonathan D B Bradley, Michael R Watts
We demonstrate monolithic integration of a wavelength division multiplexed light source for silicon photonics by a cascade of erbium-doped aluminum oxide (Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup>) distributed feedback (DFB) lasers. Four DFB lasers with uniformly spaced emission wavelengths are cascaded in a series to simultaneously operate with no additional tuning required. A total output power of -10.9  dBm is obtained from the four DFBs with an average side mode suppression ratio of 38...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28430226/stable-nanosecond-passively-q-switched-all-fiber-erbium-doped-laser-with-a-45%C3%A2-tilted-fiber-grating
#15
Tianxing Wang, Zhijun Yan, Chengbo Mou, Kaiming Zhou, Lin Zhang
Nanosecond passive Q-switching generation from an all-fiber erbium-doped laser with a UV inscribed 45° tilted fiber grating (TFG) is systematically demonstrated. The 45° TFG is employed as a polarizer together with two polarization controllers (PCs) to realize nonlinear polarization rotation (NPR). Because of the NPR effect, stable Q-switched pulses with an average output power of 17.5 mW, a single pulse energy of 72.7 nJ, a repetition rate of 241 kHz, a pulse width of 466 ns, and a signal to noise ratio (SNR) of 58...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28424926/erratum-to-co2-erbium-yag-dye-laser-combination-an-effective-and-successful-treatment-for-angiofibromas-in-tuberous-sclerosis
#16
Paolo Fioramonti, Liliana De Santo, Martina Ruggieri, Sara Carella, Federico Lo Torto, Maria Giuseppina Onesti, Nicolò Scuderi
No abstract text is available yet for this article.
April 19, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28394240/effect-of-laser-activated-irrigations-on-smear-layer-removal-from-the-root-canal-wall
#17
Xiaoli Wang, Xiaogang Cheng, Baogang Liu, Xin Liu, Qing Yu, Wenxi He
OBJECTIVE: The purpose of this study was to evaluate the effect of laser-activated irrigations (LAI) by using the Erbium: Yttrium Aluminum Garnet (Er:YAG) laser and the Erbium Chromium: Yttrium Scandium Gallium Garnet (Er,Cr:YSGG) laser on removing smear layer (SL) from the root canal wall. BACKGROUND DATA: LAI has been proposed as an adjuvant to conventional protocols of endodontic treatment to enhance the disinfection, which is a promising protocol for SL removal...
April 5, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28392716/er-yag-pre-treatment-for-bonding-of-orthodontic-bracket-1-year-of-in-vitro-treatment
#18
Rudys Rodolfo de Jesus Tavarez, Gisele Lima Bezerra, Karla Janilee de Souza Penha, Carlos Rocha Gomes Torres, Leily Macedo Firoozmand
OBJECTIVE: The aim of this study was to evaluate in vitro bond strength of metal brackets bonded with: total etch, total etch with erbium: yttrium aluminum garnet laser (Er:YAG) and self-etching adhesive systems, submitted to thermal-mechanical cycling, simulating 1 year of orthodontic treatment. MATERIALS AND METHODS: For the study, 80 bovine incisors were randomly divided into 3 experimental groups (n=16 each): XT- acid etching + Transbond XT, XT/Er:YAG- Transbond XT associated with Er:YAG laser irradiation (λ=2...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28381043/design-of-praseodymium-doped-chalcogenide-micro-disk-emitting-at-4-7-%C3%A2%C2%B5m
#19
Giuseppe Palma, Mario Christian Falconi, Florent Starecki, Virginie Nazabal, Julien Ari, Loic Bodiou, Joel Charrier, Yannick Dumeige, Emeline Baudet, Francesco Prudenzano
A compact amplifier based on chalcogenide Pr<sup>3+</sup>-doped micro-disk coupled to two ridge waveguides is designed and refined by means of a home-made computer code. The gain G ≈ 7.9 dB is simulated for a Pr<sup>3+</sup> concentration of 10 000 ppm, input signal power of -30 dBm at the wavelength 4.7 µm and input pump power of 50 mW at the wavelength 1.55 µm. In the laser behavior, i.e. without input signal, the maximum slope efficiency S = 8.1 × 10<sup>-4</sup> is obtained for an input pump power of 2 mW...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28380916/simply-integrated-dual-comb-spectrometer-via-tunable-repetition-rates-and-avoiding-self-referencing
#20
Honglei Yang, Haoyun Wei, Kun Chen, Shengkang Zhang, Yan Li
Dual-comb system with simplified integration acts a crucial role in the next stage of field-deployable application. Here we demonstrate a home-made dual-comb spectrometer that meets this requirement based on optically stabilized erbium-fiber frequency combs. The simplified integration and operability are highlighted by the embedded large motion-span automatic optical delay line that resulted in 1.7 MHz of continuous repetition rate tuning range and avoid multiple fiber cutbacks. This relaxes the second similar frequency comb duplication, therefore simplifies dual-comb system integration...
April 3, 2017: Optics Express
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