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Robert A Convissar
BACKGROUND: Lasers are promoted as viable adjunctive treatment methods for nonsurgical periodontal pocket reduction; however, the literature supporting this use is lacking. Multiple meta-analyses found no benefit to laser use for this procedure. The American Dental Association issued clinical practice guidelines about laser use in periodontal pockets, concluding that diode, neodymium:yttrium-aluminum-garnet, and erbium lasers have no benefit as adjunctive therapies to scaling and root planing...
March 13, 2018: Journal of the American Dental Association
Toru Takagi, Akira Aoki, Shizuko Ichinose, Yoichi Taniguchi, Noriko Tachikawa, Takeshi Shinoki, Walter Meinzer, Anton Sculean, Yuichi Izumi
BACKGROUND: Recently, the occurrence of peri-implantitis has been increasing. However, a suitable method to debride the contaminated surface of titanium implants has not been established. The aim of this study was to investigate the morphological changes of the microstructured fixture surface after erbium laser irradiation, and to clarify the effects of the erbium lasers when used to remove calcified deposits from implant fixture surfaces. METHODS: In experiment 1, sandblasted, large grit, acid etched surface implants were treated with Er:YAG laser or Er,Cr:YSGG laser at 30-60 mJ/pulse and 20 Hz with water spray...
March 13, 2018: Journal of Periodontology
Sergio A Vázquez-Córdova, Shanmugam Aravazhi, Christos Grivas, Yean-Sheng Yong, Sonia M García-Blanco, Jennifer L Herek, Markus Pollnau
We report on the optical-gain properties of channel waveguides patterned into lattice-matched KGdxLuyEr1- x- y(WO4 )2 layers grown onto undoped KY(WO4 )2 substrates by liquid phase epitaxy. A systematic investigation of gain is performed for five different Er3+ concentrations in the range of 0.75 to 10at.% and different pump powers and signal wavelengths. In pump-probe-beam experiments, relative internal gain, i.e., signal enhancement minus absorption loss of light propagating in the channel waveguide, is experimentally demonstrated, with a maximum value of 12 ± 5 dB/cm for signals at the peak-emission wavelength of 1534...
March 5, 2018: Optics Express
Romina Brignardello-Petersen
No abstract text is available yet for this article.
February 23, 2018: Journal of the American Dental Association
Adone Baroni
Xanthelasma palpebrarum is the most common type of xanthoma affecting the eyelids. It is characterized by asymptomatic soft yellowish macules, papules, or plaques over the upper and lower eyelids. Many treatments are available for management of xanthelasma palpebrarum, the most commonly used include surgical excision, ablative CO2 or erbium lasers, nonablative Q-switched Nd:YAG laser, trichloroacetic acid peeling, and radiofrequency ablation. This study aims to evaluate the effectiveness of RF ablation in the treatment of xanthelasma palpebrarum, with D...
March 1, 2018: Journal of Cosmetic Dermatology
Xiaoxi Wang, Shayan Mookherjea
Recirculating frequency shifter (RFS) loops can be used for electronically programmable, variable-spacing multiline spectrum generation, which can benefit the development of fully flexible optical communications and other frequency comb applications. Here, we report on and explain the observation of significant performance variations between chip-based gain in semiconductor optical amplifiers (SOA) and fiber-based gain in erbium-doped fiber amplifiers (EDFA) when used as the gain element in the RFS. Previously, SOAs and EDFAs have been demonstrated in different RFS experiments and studied separately from each other; thus, discussion mainly focused on the noise from amplified spontaneous emission...
March 1, 2018: Optics Letters
Abbas Monzavi, Reza Fekrazad, Zahra Chinipardaz, Sima Shahabi, Roohollah Behruzi, Nasim Chiniforush
PURPOSE: This study aimed to investigate and compare temperature change during implant decontamination with different laser types (carbon dioxide [Co2]/diode/neodymium-doped yttrium aluminum garnet [Nd:YAG]/erbium-doped yttrium aluminum garnet [Er:YAG]/antimicrobial photodynamic therapy [aPDT]). MATERIAL AND METHODS: Sixty implants were inserted into a bone block cut from a sheep's mandible. A 3 × 8 mm vertical lesion was made at the buccal of each implant. The bone block was placed into a 37°C water bath to simulate the in vivo oral condition...
February 27, 2018: Implant Dentistry
A R Mothes, M Runnebaum, I B Runnebaum
PURPOSE: First evaluation of dual-phase vaginal Er:YAG laser to omit hormonal treatment for atrophy-related symptoms in post-menopausal breast cancer survivors following prolapse surgery. METHODS: Patients with a history of breast cancer at the time of surgery for pelvic organ prolapse were offered non-hormonal vaginal Er:YAG laser treatment when complaining of atrophy-related genitourinary syndrome of menopause. A single 10-min course of dual-phase protocol of pulsed Er:YAG laser (2940 nm, fractional ablative and thermal mode, fluence according to tissue thickness)...
February 27, 2018: Journal of Cancer Research and Clinical Oncology
Yinshan Meng, Ling Xu, Jin Xiong, Qiong Yuan, Tao Liu, Bing-Wu Wang, Song Gao
It is very challenging to synthesize stable trivalent rare-earth complexes that coordination number is lower than 3 for the high oxidation state, large ion radius and nearly non-bonding character of trivalent lanthanide ions. Herein, the bulky phenol ligand ArOH (Ar = 2,6-Dipp2C6H3, Dipp = 2,6-diisopropylphenyl) was utilized to construct low-coordinate lanthanide compound [(ArO)Ln(OAr')] (Ar' = 6-Dipp-2-(2'-iPr-6'-CHMe(CH2-)C6H3)C6H3O-; Ln = Tb, Dy, Ho, Er, Tm). Interestingly, these complexes and free ligand ArOH were isostructural...
February 27, 2018: Angewandte Chemie
Howyda M Ebrahim, Khaled Gharib
BACKGROUND: The accentuated nasolabial folds (NLFs) is the most pronounced sign of aging. Non-ablative erbium:yttrium aluminum garnet laser (ER:YAG), Smooth mode was used for the treatment of mucosal tissue. It was reported that it is effective in facial rejuvenation. AIM: To assess the safety and the effectiveness of intraoral ER:YAG Smooth mode laser in the treatment of NLFs wrinkle. MATERIALS AND METHODS: A total of 20 patients with different grades of NLFs wrinkle treated with 2940 nm Er:YAG laser intraorally...
February 26, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Suchita, R Vijaya
In this work, we have studied the temporal coherence property of a four-wave mixing (FWM)-assisted continuous-wave erbium-doped fiber ring laser source. To understand the temporal coherence characteristics of FWM, we have analyzed the visibility of their interference pattern with the help of a Mach-Zehnder-based fiber interferometer. The visibility of FWM sidebands is compared with respect to the input pumps, with and without the cavity effect. The stand-alone FWM without any cavity effect has a visibility comparable to its input coherent pumps, while the FWM in the presence of the cavity effect has a poorer visibility due to the intra-cavity noise arising from the amplified spontaneous emission, which is not entirely annulled in broadband lasers...
February 10, 2018: Applied Optics
Ji Sun, Yue Zhou, Yitang Dai, Jianqiang Li, Feifei Yin, Jian Dai, Kun Xu
In this paper, we build a mode-locked all-polarization-maintaining figure-of-8 erbium-doped fiber oscillator based on a nonlinear amplifying loop mirror. The fiber oscillator can generate 1.6 ps chirped pulses that can be de-chirped to 500 fs at 1550 nm with a pulse energy of 0.8 nJ and a repetition rate of 12 MHz. It can be further amplified up to 10 nJ and compressed down to 100 fs with a pre-chirp managed nonlinear amplification setup. Such an oscillator and amplifier configuration has the advantages of self-starting and long-term operation, and it is highly suitable for subsequent frequency conversion, which is desirable for many applications in ultrafast microscopy and precision spectroscopy...
February 20, 2018: Applied Optics
Serkan Demirkan
Eccrine hidrocystomes (EH) are benign cystic tumors of dermal eccrine ducts. There is still no gold standard treatment option for EH because of the large number of lesions, the risk of cicatrization and the different treatment options offered. We offer combined oral isotretinoin and following erbium-yttrium aluminum garnet laser treatment as an alternative treatment option in difficult patients with EH.
February 22, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
D Quarato, M Pascali, F Carinci
Scars are a very common condition of the general population and can have a profound impact on the psyche of the patient such as low self-esteem and feelings of psychosocial isolation. Various therapeutic approaches have been proposed for improving the clinical appearance of scars. Fractional mode of ablative and non-ablative lasers has become a novel strategy for the treatment of scars. A total of 43 patients (Fitzpatrick skin type II to IV), clinically diagnosed of surgical and post-traumatic scars from January 2015 to December 2016, were treated...
January 2018: Journal of Biological Regulators and Homeostatic Agents
Xiancui Zhu, Yang Li, Dianjun Guo, Shaowu Wang, Yun Wei, Shuangliu Zhou
Herein, rare-earth metal dialkyl complexes supported by a neutral pyrrolyl-functionalized β-diketiminato ligand with the formula LRE(CH2 SiMe3 )2 (thf) (RE = Y (1a), Dy (1b), Er (1c), Yb (1d); L = MeC(NDipp)CHC(Me)NCH2 CH2 NC4 H2 -2,5-Me2 , Dipp = 2,6-i Pr2 C6 H3 ) were synthesized via the reactions of the β-diketimine HL with the rare-earth metal trialkyl complexes RE(CH2 SiMe3 )3 (thf)2 in high yields. The reactivities of 1 with pyridine derivatives, unsaturated substrates, and elemental sulfur were investigated, and some interesting chemical transformations were observed...
February 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
J X Hu, S Karamshuk, J Gorbaciova, H Q Ye, H Lu, Y P Zhang, Y X Zheng, X Liang, I Hernández, P B Wyatt, W P Gillin
Organic erbium complexes have long been of interest due to their potential for using the strong absorption into the organic to sensitise the erbium emission. Despite this interest there is remarkably little quantitative information on how effective the approach is and the discussion of the energy transfer mechanism is generally vague. Here we accurately quantify the sensitisation as a function of excitation pump density and model it using a rate equation approach. As a result, we can calculate the degree of population inversion for the erbium ions as a function of the pump intensity...
February 19, 2018: Scientific Reports
Yuval Hilerowicz, Eli Sprecher, Andrea Gat, Ofir Artzi
Schamberg's disease is one of the pigmented purpuric dermatoses (PPD). PPD encompass a large and heterogeneous group of dermatologic disorders featuring purpuric lesions often located on the lower limbs. The various forms of PPD are notoriously known to be resistant to treatment. Fractional photothermolysis has been described as a successful and safe method to induce dermal remodeling. We report three patients with Schamberg's disease who were successfully treated with 4 monthly sessions of fractional non-ablative 1540 nm erbium:glass laser, with resolution of their purpuric pigmented rash lasting up to 9 months after the last treatment session...
February 16, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Ana Carina Junqueira Bertin, Adriana Vilarinho, Ana Lúcia Ariano Junqueira
Androgenetic alopecia, also known as male and female pattern hair loss, is a very prevalent condition; however, approved therapeutic options are limited. Fractionated laser has been proposed to assist in penetration of topical medications to the cutaneous tissue. We present four cases of androgenetic alopecia that underwent treatment with a non-ablative erbium glass fractional laser followed by the application of topical finasteride 0,05% and growth factors including basic fibroblast growth factor, insulin-like growth factor, vascular endothelial growth factor, and copper peptide 1%...
February 16, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
Shahenda A Ramez, Mona M Soliman, Maha Fadel, Faisal Nour El-Deen, Maha Nasr, Eman R Youness, Dalea M Aboel-Fadl
Psoriasis is a commonly encountered chronic dermatological disease, presenting with inflammatory symptoms in patients. Systemic treatment of psoriasis is associated with several adverse effects, therefore the development of a customized topical treatment modality for psoriasis would be an interesting alternative to systemic delivery. The therapeutic modality explored in this article was the comparative treatment of psoriatic patients using nanoparticulated methotrexate in the form of jojoba oil-based microemulsion with or without fractional erbium YAG laser...
February 15, 2018: Artificial Cells, Nanomedicine, and Biotechnology
Kavitha Andiappan, Anandhavelu Sanmugam, Easwaramoorthy Deivanayagam, K Karuppasamy, Hyun-Seok Kim, Dhanasekaran Vikraman
A Schiff base ligand (SBL), N 2 , N 3 -bis (anthracen-9-ylmethylene) pyridine-2, 3-diamine, was synthesized through the condensation of 2,6-diaminopyridine and anthracene-9-carbaldehyde using a 1:2 ratio. 1 H NMR spectra confirmed the observation of non-involvement aromatic carboxylic proton in SBL. A novel series of lanthanide (i.e., praseodymium (Pr), erbium (Er), and ytterbium (Yb))-based SBL metal complexes was successfully synthesized, and their functional groups were elaborately demonstrated using UV-visible, Fourier transform infrared (FT-IR), and fluorescence spectroscopy analyses...
February 14, 2018: Scientific Reports
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