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https://www.readbyqxmd.com/read/28515467/thermal-radiation-of-er-doped-dielectric-crystals-probing-the-range-of-applicability-of-the-kirchhoff-s-law
#1
Ekembu K Tanyi, Brandi T Burton, Evgenii E Narimanov, M A Noginov
Kirchhoff's law of thermal radiation, relating emissivity and absorptance is commonly formulated for opaque bodies in thermodynamic equilibrium with the environment. However, in many systems of practical importance, both assumptions are often not satisfied. We revisit the century-old law and examine the limits of its applicability in an example of Er:YAG and Er:YLF dielectric crystals-potential radiation converters for thermophotovoltaic applications. The (80 at.%) Er:YAG crystal is opaque between 1.45 μm and 1...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#2
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/28497661/medication-related-osteonecrosis-of-the-jaw-risk-factors-in-patients-under-biphosphonate-versus-patients-under-antiresorptive-antiangiogenic-drugs
#3
Giulia Ghidini, Maddalena Manfredi, Ilaria Giovannacci, Giovanni Mergoni, Amin Sarraj, Maura Mureddu, Giovanna Giunta, Mauro Bonanini, Marco Meleti, Paolo Vescovi
BACKGROUND: Biphosphonate-Related Osteonecrosis of the Jaw (BRONJ) is a potential side effect associated with the administration of bisphosphonates; the aim of this work is to highlight the possible epidemiological differences between two groups of patients affected by MRONJ treated at the Center of Oral Medicine, Pathology and Laser Surgery of the Academic Hospital at the University of Parma, Italy, between January 2004 and June 2016. METHODS: Medical charts of 303 patients (214 Females and 89 Males, mean age 67y) treated at the Center of Oral Medicine, Pathology and Laser Surgery of the Academic Hospital at the University of Parma, between January 2004 and June 2016, were retrospectively analyzed...
May 10, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28461044/influence-of-laser-irradiation-on-the-push-out-bond-strength-between-a-glass-fiber-post-and-root-dentin
#4
Karla G F Gomes, Natália S Faria, Walter R Neto, Vivian Colucci, Erica A Gomes
STATEMENT OF PROBLEM: A major issue related to the failure of endodontically treated teeth restored with an intraradicular post is gradual debonding of the glass fiber post, resin cement, and dentin. PURPOSE: The purpose of this in vitro study was to evaluate the influence of laser irradiation on the push-out bond strength of glass fiber posts to radicular dentin. MATERIAL AND METHODS: Thirty-two mandibular bovine incisors were endodontically treated and divided into 4 groups according to the surface treatment of the post: silane control (GC); irradiation with Er:YAG (GYAG); irradiation with Er,Cr:YSGG (GCR); and 980-nm diode laser (GDI) application...
April 28, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28456059/stimulation-of-human-gingival-fibroblasts-viability-and-growth-by-roots-treated-with-high-intensity-lasers-photodynamic-therapy-and-citric-acid
#5
Paula Stephania Brandão Hage Karam, Rafael Ferreira, Rodrigo Cardoso Oliveira, Sebastião Luiz Aguiar Greghi, Maria Lúcia Rubo de Rezende, Adriana Campos Passanezi Sant'Ana, Mariana Schutzer Ragghianti Zangrando, Carla Andreotti Damante
OBJECTIVE: The aim of this study was to compare the effect of root biomodification by lasers, citric acid and antimicrobial photodynamic therapy (aPDT) on viability and proliferation of human gingival fibroblasts (FGH). DESIGN: Groups were divided in control (CC - only cells), and root fragments treated by: scaling and root planing (positice control - SC), Er:YAG (ER-60mJ,10pps,10Hz,10s,2940nm), Nd:YAG (ND-0.5W,15Hz,10s,1640nm), antimicrobial photodynamic therapy (PDT-InGaAIP,30mW,45J/cm(2),30s,660nm,toluidine blue O), citric acid plus tetracycline (CA)...
April 21, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28453869/nonsurgical-treatment-of-peri-implant-mucositis-and-peri-implantitis-at-two-piece-zirconium-implants-a-clinical-follow-up-observation-after-up-to-3-years
#6
G John, J Becker, A Schmucker, F Schwarz
OBJECTIVES: To assess the long-term clinical outcomes following nonsurgical therapy of peri-implant diseases at two-piece zirconium implants. MATERIAL & METHODS: A total of 27 patients suffering from either (i) peri-implant mucositis (n=24 implants) or (ii) peri-implantitis (n=16 implants) completed a mean follow-up period of 32.8±2.85 months (median: 34 months). The initial treatment procedures included (i) mechanical debridement + local antiseptic therapy using chlorhexidine digluconate (MD+CXH), or (ii) Er:YAG laser monotherapy (ERL)...
April 28, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28450757/selective-removal-of-natural-caries-lesions-from-dentin-and-tooth-occlusal-surfaces-using-a-diode-pumped-er-yag-laser
#7
Jamison Jew, Kenneth H Chan, Cynthia L Darling, Daniel Fried
Selective removal of caries lesions with high precision is best accomplished using lasers operating at high pulse repetition rates utilizing small spot sizes. Conventional flash-lamp pumped Er:YAG lasers are poorly suited for this purpose, but new diode-pumped solid-state (DPSS) Er:YAG lasers have become available operating at high pulse repetition rates. Microradiography was used to determine the mineral content of the demineralized dentin of 200-μm thick sections with natural caries lesions prior to laser ablation...
January 28, 2017: Proceedings of SPIE
https://www.readbyqxmd.com/read/28426336/effect-of-laser-energy-and-tip-insertion-depth-on-the-pressure-generated-outside-the-apical-foramen-during-er-yag-laser-activated-root-canal-irrigation
#8
Kanako Yao, Kazuhisa Satake, Satoshi Watanabe, Arata Ebihara, Chihiro Kobayashi, Takashi Okiji
OBJECTIVE: The risk of extrusion of irritative irrigants into the extraradicular tissue should be minimized during root canal irrigation. This study aimed to examine the pressure generated outside the apex during Er:YAG laser-activated irrigation (LAI) in comparison with passive ultrasonic irrigation (PUI) and conventional syringe irrigation (SI). BACKGROUND DATA: LAI is reported to be efficient for root canal debridement, whereas the apical pressure generated during LAI has not been investigated in detail...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28426292/efficacy-of-three-different-lasers-on-eradication-of-enterococcus-faecalis-and-candida-albicans-biofilms-in-root-canal-system
#9
Silvija Kasić, Marita Knezović, Nataša Beader, Dragana Gabrić, Ana Ivanišević Malčić, Anja Baraba
OBJECTIVE: The objective was to compare the efficacy of three different lasers in disinfection of root canals inoculated with Enterococcus faecalis and Candida albicans biofilms. BACKGROUND: Endodontic space disinfection depends on the type of root canal irrigant used and the way it is delivered and agitated because irrigants have limited ability to reach all parts of root canal system. MATERIALS AND METHODS: Thirty single-rooted human teeth were selected...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28422595/microleakage-of-sealants-after-phosphoric-acid-er-yag-laser-and-air-abrasion-enamel-conditioning-systematic-review-and-meta-analysis
#10
Ana Caroline Fumes, Daniele Lucca Longo, Andiara De Rossi, Tatiana Kelly da Silva Fidalgo, Francisco Wanderley Garcia de Paula E Silva, Maria Cristina Borsatto, Erika Calvano Küchler
PURPOSE: The aim of this systematic review and meta-analysis is to answer the focused question: Does the application of phosphoric acid, Er:YAG laser and air abrasion enamel conditioning methods previous to the oclusal sealant application in human permanent molars influence the microleakage? STUDY DESIGN: A literature research was carried out in the Pubmed Medline, Web of Science, Scopus and Cochrane databases using with the MeSH terms and keyword search strategy...
2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28394240/effect-of-laser-activated-irrigations-on-smear-layer-removal-from-the-root-canal-wall
#11
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
#12
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/28375683/can-we-improve-the-laser-etching-with-the-digitally-controlled-laser-handpiece-xrunner
#13
Hilal Yilanci, Serdar Usumez, Aslihan Usumez
OBJECTIVE: The aim of this study was to compare the shear bond strength (SBS), enamel surface characteristics, and the adhesive remnant index (ARI) scores of different etching methods. BACKGROUND DATA: Laser etching changes the physical characteristics of the enamel surface and these alterations hold promise for the conditioning of enamel for bonding procedures. A new Er:YAG laser handpiece is unique in its ability to digitally control size, shape, and depth of irradiated enamel area...
April 5, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28375299/passive-q-switching-of-an-er-yb-glass-laser-with-co-mg-al-ga-sub-2-sub-o-sub-4-sub-based-glass-ceramics
#14
V Vitkin, P Loiko, O Dymshits, A Zhilin, I Alekseeva, D Sabitova, A Polishchuk, A Malyarevich, X Mateos, K Yumashev
Transparent glass-ceramics (GCs) containing Co:Mg(Al,Ga)<sub>2</sub>O<sub>4</sub> nanocrystals (mean diameter of 7-9 nm) are synthesized by heat treatments at 850-950°C from magnesium aluminosilicate glass nucleated by TiO<sub>2</sub> and doped with Ga<sub>2</sub>O<sub>3</sub> and CoO. The GCs exhibit a broadband A<sub>2</sub>4(F4)→T<sub>1</sub>4(F4) absorption due to the Co<sup>2+</sup> ions, low saturation fluence (∼0...
March 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28375238/few-layered-mos-sub-2-sub-as-a-saturable-absorber-for-a-passively-q-switched-er-yag-laser-at-1-6%C3%A2-%C3%A2-%C3%AE-m
#15
Hongwang Xia, Ming Li, Tao Li, Shengzhi Zhao, Guiqiu Li, Kejian Yang
The passively Q-switched Er:YAG laser at 1.6 μm was achieved with a YAG-based MoS<sub>2</sub> saturable absorber (SA) for the first time. The saturable absorption properties of the MoS<sub>2</sub> SA near 1.6 μm were investigated. Under an absorbed pump power of 8.09 W, an average output power of 1.08 W with a pulse duration of 1.138 μs and a repetition rate of 46.6 kHz was obtained, corresponding to an optical conversion efficiency of 40.67%. The pulse energy and peak power were calculated to be 23...
April 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28374298/peri-procedure-laser-scar-therapy-protocol-a-pilot-survey-of-plastic-surgeons-practices
#16
Michael Mirmanesh, Zachary Borab, Madeleine Gantz, Pirko Maguina
BACKGROUND: Scar management using laser phototherapy continues to evolve as it gains wide acceptance among patients and providers. Despite widespread use of laser therapy, there are no guidelines or consensus published regarding optimal pre- and post-procedure patient management. Our objective is to gain insight into the best laser practices; we decided to poll colleagues nationwide. METHODS: An online survey was distributed to members of the American Society of Plastic Surgeons...
April 3, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28364861/laser-therapy-for-the-restoration-of-vaginal-function
#17
REVIEW
Marco Gambacciani, Santiago Palacios
Laser therapy has a therapeutic role in various medical conditions and most recently has gained interest as a non-hormonal treatment for genitourinary syndrome of menopause (GSM) and as a non-invasive option for stress urinary incontinence (SUI). Several therapies are available to alleviate GSM symptoms, including hormonal and non-hormonal products. Both microablative fractional CO2 laser and the non-ablative vaginal Er:YAG laser (VEL) induce morphological changes in the vaginal tissues, and data from non-randomized clinical trials suggest that laser therapy can alleviate vaginal dryness and dyspareunia...
May 2017: Maturitas
https://www.readbyqxmd.com/read/28364108/-bactericidal-effects-and-smear-layer-removal-of-er-yag-laser-radiation-against-enterococcus-faecalis-in-root-canals
#18
Zongbo Li, Changyun Fang
To evaluate the cleaning ability of Er:YAG laser against Enterococcus faecalis in root canals.
 Methods: The single-rooted human teeth were sterilized and inoculated with Enterococcus faecalis and were randomly assigned into 2 groups. A group of teeth was irrigated with saline during root canal preparation while another group with NaClO. After mechanical preparation, the two groups were randomly divided into 3 subgroups according to the different treatments: Samples, laser radiation, and calcium hydroxide intracanal medication for 7 days...
March 28, 2017: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/28358185/lasers-in-the-treatment-of-acne
#19
Marina Perper, John Tsatalis, Ariel E Eber, Jessica Cervantes, Keyvan Nouri
Acne is a chronic disease of the pilosebaceous units, presenting as inflammatory or noninflammatory lesions, affecting primarily the face but also the back and chest. The mainstay of treatment remains topical retinoids, benzoyl peroxide, azelaic acid, antibiotics, and isotretinoin, many of which result in poor compliance, lack of durable remission, and incur adverse effects. The use of lasers to treat acne is continuously increasing because of their minimal complications, limited number of office-based treatments required, potential benefits of simultaneously treating acne scarring, and the rapid onset of results...
March 28, 2017: Giornale Italiano di Dermatologia e Venereologia: Organo Ufficiale, Società Italiana di Dermatologia e Sifilografia
https://www.readbyqxmd.com/read/28357598/the-effect-of-er-yag-laser-irradiation-on-the-bond-stability-of-self-etch-adhesives-at-different-dentin-depths
#20
Muhammet Karadas, İpek Çağlar
The aim of this study was to evaluate the effect of Er:YAG laser irradiation on the micro-shear bond strength of self-etch adhesives to the superficial dentin and the deep dentin before and after thermocycling. Superficial dentin and deep dentin surfaces were prepared by flattening of the occlusal surfaces of extracted human third molars. The deep or superficial dentin specimens were randomized into three groups according to the following surface treatments: group I (control group), group II (Er:YAG laser; 1...
March 30, 2017: Lasers in Medical Science
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