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YAG laser

Ersan Celik, Sezgi Cinel Sahin, Doğu Ömür Dede
OBJECTIVE: The purpose of this study was to evaluate the effects of different surface treatments on the shear bond strength (SBS) of a composite resin to the various resin matrix ceramics (RMC). BACKGROUND: Clinical applications of physical and chemical surface conditioning methods may be required for RMC to optimize the adhesion of additional resin materials. MATERIALS AND METHODS: Ninety-nine RMC specimens (6 × 6 × 2 mm) were prepared from a resin nanoceramic (RNC), a polymer-infiltrated hybrid ceramic (PIHC), and a flexible hybrid ceramic (FHC) block with a cutting machine under copious water...
July 18, 2018: Photomedicine and Laser Surgery
Amanda Abramson Lloyd, Michael S Graves, Edward V Ross
BACKGROUND AND OBJECTIVE: Epidermal preservation is essential during laser treatment for vascular, hair, and benign pigment dyschromias. Epidermal tolerance is determined by epidermal melanin content, fluence, pulse width, wavelength, skin cooling, and spot size. The authors' objective was to determine the maximum epidermal tolerance for the long-pulse alexandrite 755 nm and the long-pulse neodymium-doped yttrium aluminum garnet (Nd:YAG) 1064-nm lasers for varying epidermal melanin content...
July 16, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Shamekh Mohamed El-Shamy, Mohamed Salaheldien Mohamed Alayat, Abdelgalil Allam Abdelgalil, Mansour Abdullah Alshehri
OBJECTIVE: The aim of this study was to evaluate the long-term impact of a pulsed neodymium-doped yttrium aluminum garnet (Nd:YAG) laser [high-intensity laser therapy (HILT)] in the treatment of juvenile rheumatoid arthritis (JRA). MATERIALS AND METHODS: A sample of 30 children participated in this study (15 in the laser group and 15 in the placebo group), with a mean age of 10.53 ± 1.25 years. Children who were randomly assigned to the laser group received HILT thrice per week for 4 weeks, plus the exercise program...
July 17, 2018: Photomedicine and Laser Surgery
E Roitero, M Anglada, F Mücklich, E Jiménez-Piqué
The aim of this work is to test the mechanical properties of dental zirconia surfaces patterned with Nd:YAG laser interference (λ = 532 nm and 10 ns pulse). The laser treatment produces an alteration of the topography, engraving a periodic striped pattern. Laser-material interaction results mainly in thermal effects producing microcracking, phase transformation and texturization. The role of such microstructural modifications and collateral damage on the integrity and mechanical performances has been assessed...
June 28, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Logan W Thomas, Erica B Wang, Jennifer Urban, Jared Jagdeo
Laser hair reduction is a well-established modality for a wide range of medical indications. Laser hair reduction can be beneficial for hemodialysis patients who undergo repeated adhesive tape application and removal at their hemodialysis site during hemodialysis sessions. There is a paucity of published literature on efficacious laser hair removal treatments for hemodialysis patients. Herein, we present a case of a 50-year-old male (Fitzpatrick III) with end-stage renal disease on hemodialysis, who achieved successful laser hair reduction at his hemodialysis vascular access site with five sessions of a neodymium:yttrium-aluminium-garnet (Nd:YAG) laser (1064 nm) to improve his quality of life by reducing the hair burden at the adhesive tape site application...
July 1, 2018: Journal of Drugs in Dermatology: JDD
Duo Pan, Tiantian Shi, Jingbiao Chen
Active optical clock (AOC) has the intrinsic suppression of the influence of cavity's noise on the output frequency, giving rise to the potentially ultra-narrow linewidth. To break the cavity's thermal noise limitation by taking full advantage of the AOC'S principle, as well as to achieve a long-term instability, we propose a scheme of cavity stabilized active optical clock (CSAOC). The system consists of two key procedures: the dual-wavelength (DW) output signals share a same cavity and work in the good and the bad cavity regime respectively...
July 10, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
A F Kornev, V P Pokrovskiy, S V Gagarskiy, Ya Yu Fomicheva, P A Gnatyuk, A S Kovyarov
An end-pumped Nd:YAG 946 nm laser with pulse duration of 1.6 ns, output energy of 2.5 mJ, and pulse repetition rate of 50 Hz is described. Such a combination of the parameters achieved has become possible due to the implementation of the cavity-dumping mode.
July 15, 2018: Optics Letters
Xiaoming Ren, Lam H Mach, Yanchun Yin, Yang Wang, Zenghu Chang
We demonstrate the generation of 2.3 mJ, 88 fs, 2.5 μm laser pulses at 1 kHz repetition rate from a three-stage chirped pulse amplifier employing Cr2+ :ZnSe crystals as the active gain media. 5 μJ seed of the amplifier is obtained via intrapulse difference frequency generation in a bismuth triborate (BIBO) crystal from spectrally broadened Ti:Sapphire amplifier output. A multi-pass amplifier followed by two single-pass amplifiers pumped by Q-switched Ho:YAG lasers boost the pulse energy to 6.5 mJ, yielding 2...
July 15, 2018: Optics Letters
Ting Li, Xiaolin Zhang, Hong Shi, Zhe Ma, Bingjian Lv, Meng Xie
The aim of this meta-analysis was to systematically evaluate the applications of Er:YAG lasers for the removal of caries and cavity preparation in children. The meta-analysis was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) and was conducted with data extracted from seven relevant randomized controlled trials (RCTs) published from 1997 to July 2017. The data heterogeneity of each study was assessed by a Q test. We used the heterogeneity results to calculate the standard mean difference (SMD) or relative risk (RR) and 95% confidence interval (95%CI) using STATA version 10...
July 12, 2018: Lasers in Medical Science
Yuji Tsuka, Ryo Kunimatsu, Hidemi Gunji, Kengo Nakajima, Aya Kimura, Tomoka Hiraki, Ayaka Nakatani, Kotaro Tanimoto
Low-level laser therapy has become one of the fastest growing fields of medicine in recent years. Many in vivo and in vitro studies have shown that laser irradiation activates a range of cellular processes in a variety of cell types and can promote tissue repair. However, few in vitro experiments have evaluated the effects of laser irradiation on cells in real time. The purpose of this study was to examine the effects of neodymium-doped yttrium aluminum garnet (Nd:YAG) laser irradiation on the migration of cultured human osteoblasts...
July 12, 2018: Lasers in Medical Science
Sumit Gupta, Vineet Relhan, Vijay Kumar Garg, Bijaylaxmi Sahoo
Background: Accurate preparation of recipient area is a critical step in melanocyte-keratinocyte transplantation procedure for vitiligo. It is an important potential step for adaptation in the quest to achieve better results and ablative lasers potentially offer excellent precision over margin and depth control in achieving that. Objective: To compare between the two techniques used for recipient site preparation: Er:YAG laser ablation and mechanical dermabrasion for melanocyte-keratinocyte transplantation procedure in terms of re-pigmentation achieved and adverse effects seen...
July 9, 2018: Indian Journal of Dermatology, Venereology and Leprology
J Dong, S G Peng, X Y Zhang, C G Tong, F Liu, M Cao, Y H Li, Y L He
Pyogenic granuloma (PG) is a common benign vascular proliferation which often occurs on the head, neck, hands, and feet. Among the various treatment options for PG, surgical excision is the most effective treatment which offers the lowest overall recurrence rates and also provides the exact diagnosis. However, it could have difficulties to do the surgery when lesions are located on the fingers and toes, especially very near to the nails, so laser may be a very good alternative choice. In this article, we evaluated the clinical efficacy and safety of neodymium-yttrium aluminum garnet (Nd:YAG) laser for treatment of PG located on the fingers and toes...
July 11, 2018: Lasers in Medical Science
Taeyang Kim, Jinwook Kim, Xiaoning Jiang
In this work, we present an ultrasound non-destructive testing (NDT) method for high temperature applications using laser-generated Lamb waves and aluminum nitride (AlN) sensors. Lamb waves were introduced to a stainless steel plate by the Nd:YAG pulsed laser at one point and detected by an AlN receiver at a distant position. The fundamental symmetric (S0) and antisymmetric (A0) Lamb waves generated by the pulsed laser were successfully detected by the AlN sensor. This detection was done on a stainless steel plate at temperatures ranging from room temperature to about 800 °C, with a signal-to-noise ratio (SNR) of higher than 20 dB...
May 21, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Sogra Yassaei, Hossein Aghili, Neda Shahraki, Isa Safari
Objective: This study aimed to assess the efficacy of erbium-doped yttrium aluminum garnet (Er:YAG) laser, pastes containing casein phosphopeptide amorphous calcium phosphate (CPP-ACP) with and without fluoride and their combination for prevention of white spot lesions in the enamel. Materials and Methods: This in vitro experimental study was conducted on 90 extracted sound premolars. The teeth were then randomly divided into six groups of 15: (1) Control, (2) laser, (3) CPP-ACP with fluoride (GC MI Paste, Recaldent™ 900 ppm as NaF), (4) CPP-ACP without fluoride (GC Tooth Mousse Recaldent™), (5) laser + CPP-ACP with fluoride, and (6) laser + CPP-ACP without fluoride...
April 2018: European Journal of Dentistry
Roxana Sarmadi, Elin Viktoria Andersson, Peter Lingström, Pia Gabre
Objective: The aim of this study was to evaluate patients´ experiences of two excavation methods, Er:YAG laser and rotary bur and time required by the methods as well as objective assessments of quality and durability of restorations over a two-year period. Methods: A prospective, single-blind, randomized and controlled investigation was performed. Patients aged 15 to 40 years with at least two primary caries lesions, which had been radiographically assessed as of the same size, were recruited...
2018: Open Dentistry Journal
Tao Luo, Zhaochu Hu, Wen Zhang, Yongsheng Liu, Keqing Zong, Lian Zhou, Junfeng Zhang, Shenghong Hu
The U-Pb geochronologic analysis of accessory minerals has played an important role in Earth and solar system science in constraining the ages of a wide variety of rocks and minerals. Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is one of the most popular techniques for U-Pb geochronologic analysis. Currently, the significant matrix effects observed between different accessory minerals and the lack of high-quality standards for many minerals of interest are the major limitations of its geochronological applications...
July 10, 2018: Analytical Chemistry
Laís Lima Pelozo, Reinaldo Dias Silva-Neto, Silmara Aparecida Milori Corona, Regina Guenka Palma-Dibb, Aline Evangelista Souza-Gabriel
Root-filled teeth that received fiber posts most frequently fail at the adhesive interface between resin cement and dentin. The objective of this study is to evaluate the effect of Er:YAG laser and/or sodium ascorbate (SA) on bond strength, microhardness of dentin, and penetration depth of cement into dentinal tubules. Forty-eight bovine incisor roots were endodontically treated, post spaces were prepared and equally divided into four groups (n = 12): G1-distilled water (control); G2-10% SA (10 min); G3-Er:YAG laser (150 mJ/4 Hz/40 s), and G4-Er:YAG laser + 10% SA...
July 9, 2018: Lasers in Medical Science
Antonis Kallis, Kosmas Tolidis, Paris Gerasimou, Dimitrios Dionysopoulos
The purpose of this study was to evaluate the thickness and qualitative characteristics of the hybrid layer after two cavity preparation methods, using Er:YAG laser in QSP mode and conventional carbide burs. Additionally, two different adhesive techniques were investigated using etch-and-rinse and self-etch adhesive systems. Sixty sound human third molars were used and were randomly divided into four groups (n = 15). In the first two groups, large (4 mm length, 3 mm wide, and 3 mm deep) class I cavities were prepared using Er:YAG laser (2...
July 8, 2018: Lasers in Medical Science
Amirhossein Mirhashemi, Nasim Chiniforush, Hanieh Jadidi, Nastaran Sharifi
This study investigated the effect of Er:YAG (smart 2940 Dplus, DEKA, Italy) and Er:CrYSGG (Waterlase iPlus, Biolase, USA) lasers on the shear bond strength (SBS) between the orthodontic brackets and dental porcelain in comparison with conventional acid etching with 9% hydrofluoric acid (HF, Ultradent, USA). A total of 60 specimens of maxillary incisor crown were prepared and randomly assigned to five groups; each group was subjected to a different porcelain surface conditioning: (1) etching with the 9% HF for 2 min; (2) etching with the 9% HF for 2 min followed by irradiation with the Er:CrYSGG laser (3-W power, 10-Hz frequency for 10 s); (3) etching with the 9% HF for 2 min followed by irradiation with the Er:YAG laser (3-W power, 10-Hz frequency for 10 s); (4) Irradiation with the Er:CrYSGG laser (3-W power, 10-Hz frequency for 10 s without acid etching) and (5) irradiation with the Er:YAG laser (3-W power,10-Hz frequency for 10 s without acid etching)...
July 6, 2018: Lasers in Medical Science
Anna Deda, Aleksandra Lipka-Trawińska, Sławomir Wilczyński, Barbara Błońska-Fajfrowska
Pearly penile papules (PPP) are physiological lesions in the epithelium of the corona of the glans penis which extend to its neck. These lesions may also appear on both sides of the frenulum. Although they are not pathological, the lesions frequently cause concern or embarrassment/discomfort in patients. They are the most common reason for seeing a dermatologist. There are several methods of treatment for PPP such as cryosurgery, electrocoagulation, treatment with CO2 , Er:YAG, or pulsed dye lasers. This paper describes the authors' experience in removing PPP with a CO2 laser...
July 6, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
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