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Amita Rani, Sujata Mohanty, Pankaj Sharma, Jitender Dabas
INTRODUCTION: Alveolar osteitis (AO) is a well-known complication following tooth extraction. Plethora of literature is available regarding its treatment modalities signifying that none of the treatment is as effective as any another treatment. LASER on the other hand, has been used to promote soft tissue healing. MATERIAL AND METHOD: In order to evaluate the effects of laser on healing of AO we undertook a randomized clinical trial. In the trial, sixty patients diagnosed with AO were randomly divided into three groups viz: alvogyl, diode laser and Er:Cr:YSGG laser (erbium chromium yttrium scandium gallium garnet)...
September 2016: Journal of Maxillofacial and Oral Surgery
Adel Mesbah, Nicolas Clavier, M Janeth Lozano-Rodriguez, Stephanie Szenknect, Nicolas Dacheux
Pure powdered compounds with a general formula Th1-xErx(SiO4)1-x(PO4)x belonging to the zircon-xenotime family were successfully synthesized under hydrothermal conditions (250 °C, 7 days) as recently reported for the preparation of coffinite. Therefore, a thorough, combined PXRD, EDX, EXAFS, Raman, and FTIR analysis showed the formation of a solid solution in agreement with Vegard's law. Moreover, the examination of the local structure shows that the Th-O distances remain close to those found in ThSiO4, whereas the Er-O distances show a significant decrease from 2...
October 17, 2016: Inorganic Chemistry
So Eun Park, Sang Seok Kim, Chul Woo Kim, Young Her
No abstract text is available yet for this article.
October 2016: Annals of Dermatology
Rana Al-Falaki, Francis Hughes, Reena Wadia, Christie Eastman, Elias Kontogiorgos, Samuel Low
Aims: This is an extended case series of patients treated with an Erbium, Chromium: Yttrium Scandium Gallium Garnet (Er,Cr:YSGG) laser as an adjunct to scaling for the management of intrabony defects. Materials & methods: 46 patients with 79 angular intrabony defects associated with pocket depths of >5mm, and a mean age of 53 ± 9 years presenting with chronic periodontitis were included in the analysis. All patients underwent a localized minimally invasive closed flap surgery utilizing Er,Cr:YSGG laser therapy...
June 29, 2016: Laser Therapy
Yang Zheng, Changming Chen, Jihou Wang, Zuosen Shi, Zhenzhen Cai, Xiaoqiang Sun, Fei Wang, Zhanchen Cui, Daming Zhang
In this work, a novel polymer thermo-optic switch with loss compensation function is successfully designed and fabricated by direct UV-writing technology. The waveguide core and cladding layer material of the switch are based on the low-loss fluorinated photopolymer and erbium-containing gain copolymer. The absorption loss characteristics and thermal stabilities of the core and cladding materials are studied. The optimal optical field distribution for loss-compensation structures is analyzed by modifying refractive index difference between the core and cladding...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
Rui Ye, Chao Xu, Xingjun Wang, Jishi Cui, Zhiping Zhou
Near-infrared up-conversion lasing in erbium(Er)-yttrium(Y) chloride silicate nanowires was demonstrated when pumped by 1476 nm laser at room temperature. The emission covers a very wide wavelength range (400-1000 nm). A clear threshold for 985 nm peak was observed at a launched average pump power of approximately 7 mW. Above threshold, the intensity increases linearly when turning up the pump power. The full width at half maximum at 985 nm decreases from 1.25 nm to 0.25 nm when reducing the measurement temperature from 30 K to 7 K, which is the narrowest linewidth of 980 nm micro-lasers to date...
October 5, 2016: Scientific Reports
Arwa A Alaulamie, Susil Baral, Samuel C Johnson, Hugh H Richardson
An optical nanothermometer technique based on laser trapping, moving and targeted attaching an erbium oxide nanoparticle cluster is developed to measure the local temperature. The authors apply this new nanoscale temperature measuring technique (limited by the size of the nanoparticles) to measure the temperature of vapor nucleation in water. Vapor nucleation is observed after superheating water above the boiling point for degassed and nondegassed water. The average nucleation temperature for water without gas is 560 K but this temperature is lowered by 100 K when gas is introduced into the water...
October 4, 2016: Small
Alessandro Montedori, Iosief Abraha, Massimiliano Orso, Potito Giuseppe D'Errico, Stefano Pagano, Guido Lombardo
BACKGROUND: Despite considerable improvements in oral health, dental caries continue to be a public health issue. The most frequently used, and universally accepted technique, to remove caries is through mechanical ablation of decayed tissues by means of rotating drills (diamond or tungsten carbide, or both). In the past few decades, the introduction of adhesive filling materials (resin composites) has affected cavity filling procedures by reducing its retention needs, with advantages for dental tissue conservation...
September 26, 2016: Cochrane Database of Systematic Reviews
Yang Deng, Xiaodan Zhu, Dan Zheng, Ping Yan, Han Jiang
BACKGROUND: The authors of this study evaluated the effects of lasers on the outcome of direct pulp capping by means of a meta-analysis. TYPES OF STUDIES REVIEWED: The authors completed a literature search on PubMed, Cochrane Library, Embase, and China National Knowledge Infrastructure, as well as a manual search of the reference lists of all identified articles since the introduction of lasers in endodontics in 1971 through May 30, 2016. The authors systematically evaluated the studies that met the inclusion criteria and performed a meta-analysis...
September 21, 2016: Journal of the American Dental Association
Lianlian Dong, Fang Xie, Sen Ma, Yunzhi Wang, Liang Chen
A simple tunable dual-wavelength fiber laser was developed and multiple self-mixing interferometry to large step height measurement was demonstrated. The fiber laser, which can emit two wavelengths without laser mode competition, is composed of a single fiber ring cavity and two fiber branches. Each branch includes a length of erbium-doped fiber and a fiber Bragg grating. Large step heights can be measured using multiple self-mixing interference of the two wavelengths. The maximum height that can be measured is half synthetic wavelength of the two wavelengths...
September 19, 2016: Optics Express
B Hari Babu, Matthieu Lancry, Nadege Ollier, Hicham El Hamzaoui, Mohamed Bouazaoui, Bertrand Poumellec
The impact of fictive temperature (T<sub>f</sub>) on the evolution of point defects and optical attenuation in non-doped and Er<sup>3+</sup>-doped sol-gel silica glasses was studied and compared to Suprasil F300 and Infrasil 301 glasses before and after γ-irradiation. To this aim, sol-gel optical fiber preforms have been fabricated by the densification of erbium salt-soaked nanoporous silica xerogels through the polymeric sol-gel technique. These γ-irradiated fiber preforms have been characterized by FTIR, UV-vis-NIR absorption spectroscopy, electron paramagnetic resonance, and photoluminescence measurements...
September 20, 2016: Applied Optics
Serguei Stepanov, Marcos Plata Sánchez, Eliseo Hernández Hernández
Experimental investigations of the main noise sources that limit the sensitivity of the adaptive interferometric all-fiber sensors operating in the communication wavelength region are reported. Adaptive properties (i.e., the autostabilization of an optimal operation point of the interferometer) are enabled by the dynamic population grating recorded in a segment of the erbium-doped fiber (EDF) at milliwatt-scale cw power in the 1480-1560 nm spectral range. The utilized symmetric Sagnac configuration with low light internal reflections ensures reduced sensitivity of the sensor to phase noise of the laser, while intensity noise is reduced to an insignificant level by the balanced detection scheme...
September 10, 2016: Applied Optics
Yushi Chu, Jing Ren, Jianzhong Zhang, Gangding Peng, Jun Yang, Pengfei Wang, Libo Yuan
Erbium doped bismuth borosilicate (BBS) glasses, possessing the broadest 1.55 μm near infrared (NIR) emission band among oxide glasses, stand out as excellent fiber material for optical fiber amplifiers. In this work, we demonstrate that both broadened and enhanced NIR emission of Er(3+) can be obtained by sensibly combining the effects such as mixed glass former effect, phonon-assisted energy transfer (PAET) and de-excitation effect induced by codopant. Specially, by codoping CeO2 in a controlled manner, it leads to not only much improved optical quality of the glasses, enhanced NIR emission, but also significantly suppressed energy transfer up-conversion (ETU) luminescence which is detrimental to the NIR emission...
2016: Scientific Reports
Bernd Metzger, Benjamin Pollard, Ingo Rimke, Edlef Büttner, Markus B Raschke
We demonstrate the single-step generation of mid-infrared femtosecond laser pulses in a AgGaSe<sub>2</sub> optical parametric oscillator that is synchronously pumped by a 100 MHz repetition rate sub-90 fs erbium fiber laser. The tuning range of the idler beam in principle covers ∼3.5 to 17 μm, only dependent on the choice of cavity and mirror design. As an example, we experimentally demonstrate idler pulse generation from 4.8 to 6.0 μm optimized for selective vibrational resonant molecular spectroscopy...
September 15, 2016: Optics Letters
Ayhan Eymirli, Emre Nagas, Mehmet Ozgur Uyanik, Zafer Cavit Cehreli
OBJECTIVE: This study assessed the efficacy of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser-activated irrigation (LAI) of ethylene diaminetetraacetic acid (EDTA) and phytic acid on the removal of calcium hydroxide (CH) and triple antibiotic paste (TAP) from root canals. BACKGROUND DATA: Although some studies investigated the efficacy of LAI of EDTA irrigation, no study has been conducted to investigate the efficacy of LAI of phytic acid in the removal of CH and TAP from root dentin...
September 12, 2016: Photomedicine and Laser Surgery
Kana Iwakuni, Sho Okubo, Osamu Tadanaga, Hajime Inaba, Atsushi Onae, Feng-Lei Hong, Hiroyuki Sasada
We have observed an ultra-broadband frequency comb with a wavelength range of at least 0.35 to 4.4 μm in a ridge-waveguide-type periodically poled lithium niobate device. The PPLN waveguide is pumped by a 1.0-2.4 μm wide frequency comb with an average power of 120 mW generated using an erbium-based mode-locked fiber laser and a following highly nonlinear fiber. The coherence of the extended comb is confirmed in both the visible (around 633 nm) and the mid-infrared regions.
September 1, 2016: Optics Letters
Xiao Jin, Haiyang Li, Dongyu Li, Qin Zhang, Feng Li, Weifu Sun, Zihan Chen, Qinghua Li
Insufficient harvest of solar light energy is one of the obstacles for current photovoltaic devices to achieve high performance. Especially, conventional organic/inorganic hybrid solar cells (HSCs) based on PTB7 as p-type semiconductor can only utilize 400-800 nm solar spectrum. One effective strategy to overcome this obstacle is the introduction of up-conversion nanophosphors (NPs), in the virtue of utilizing the near infrared region (NIR) of solar radiation. Up-conversion can convert low-energy photons to high-energy ones through multi-photon processes, by which the solar spectrum is tailored to well match the absorptive domain of the absorber...
September 5, 2016: Optics Express
Markus Meissner, Johannes Kleemann, Roland Kaufmann, Falk Ochsendorf
Scrotal calcinosis is a rare local entity characterized by multiple, calcified and painless nodules of the scrotal skin and was first described by Lewinski in 1883 (Figure 1a).(1) It normally appears in men aged 20-40 years.(2) For a long time, the pathological origin of this disease was unclear. In the last years it became more and more obvious, that dystrophic calcification of epithelial cysts involving inflammation, rupture, calcification and finally obliteration of the cyst wall is the main pathological correlate for scrotal calcinosis...
September 8, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
Heidi Wat, Douglas C Wu, Henry Hin Lee Chan
BACKGROUND AND OBJECTIVE: Fractionated photothermolysis (FP) has revolutionized modern laser technology. By creating selective columns of microthermal damage, fractionated devices allows for greater treatment depths to be achieved without the prolonged downtime and risk of complications seen in traditional fully ablative laser resurfacing. Fractional resurfacing is a proven method to treat a variety of cutaneous conditions. In the Caucasian patient, a wide range of devices and treatment settings can be utilized safely and effectively...
September 8, 2016: Lasers in Surgery and Medicine
Guangchao Zhang, Baojia Deng, Shaowu Wang, Yun Wei, Shuangliu Zhou, Xiancui Zhu, Zeming Huang, Xiaolong Mu
Different di and trinuclear rare-earth metal complexes supported by 3-amido appended indolyl ligands were synthesized and their catalytic activities towards isoprene polymerization were investigated. Treatment of [RE(CH2SiMe3)3(thf)2] with 1 equiv. of 3-(CyN[double bond, length as m-dash]CH)C8H5NH in toluene or in THF afforded dinuclear rare-earth metal alkyl complexes having indolyl ligands in different hapticities with central metals {[η(2):η(1)-μ-η(1)-3-(CyNCH(CH2SiMe3))Ind]RE-(thf)(CH2SiMe3)}2 (Cy = cyclohexyl, Ind = Indolyl, RE = Yb (1), Er (2), Y (3)) or {[η(1)-μ-η(1)-3-(CyNCH(CH2SiMe3))Ind]RE-(thf)2(CH2SiMe3)}2 (RE = Yb (4), Er (5), Y (6), Gd (7)), respectively...
October 21, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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