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Lasers in Medical Science

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https://www.readbyqxmd.com/read/28920187/sub-ablative-er-cr-ysgg-laser-irradiation-under-all-ceramic-restorations-effects-on-demineralization-and-shear-bond-strength
#1
Serdar Bağlar
This study evaluated the caries resistant effects of sub-ablative Er,Cr:YSGG laser irradiation alone and combined with fluoride in comparison with fluoride application alone on enamel prepared for veneer restorations. And also, evaluated these treatments' effects on the shear bond strength of all-ceramic veneer restorations. One hundred and thirty-five human maxillary central teeth were assigned to groups of 1a-control, 1b-laser treated, 1c-fluoride treated, 1d-laser + fluoride treated for shear bond testing and to groups of 2a-positive control(non-demineralised), 2b-laser treated, 2c-fluoride treated, 2d-laser + fluoride treated, 2e-negative control (demineralised) for microhardness testing (n = 15, N = 135)...
September 17, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28900751/effect-of-wavelength-and-beam-width-on-penetration-in-light-tissue-interaction-using-computational-methods
#2
Caerwyn Ash, Michael Dubec, Kelvin Donne, Tim Bashford
Penetration depth of ultraviolet, visible light and infrared radiation in biological tissue has not previously been adequately measured. Risk assessment of typical intense pulsed light and laser intensities, spectral characteristics and the subsequent chemical, physiological and psychological effects of such outputs on vital organs as consequence of inappropriate output use are examined. This technical note focuses on wavelength, illumination geometry and skin tone and their effect on the energy density (fluence) distribution within tissue...
September 12, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28895000/endoscopic-diode-laser-therapy-for-chronic-radiation-proctitis
#3
Lino Polese, Lucia Marini, Roberto Rizzato, Edgardo Picardi, Stefano Merigliano
The purpose of this study is to determine the effectiveness of endoscopic diode laser therapy in patients presenting rectal bleeding due to chronic radiation proctitis (CRP). A retrospective analysis of CRP patients who underwent diode laser therapy in a single institution between 2010 and 2016 was carried out. The patients were treated by non-contact fibers without sedation in an outpatient setting. Fourteen patients (median age 77, range 73-87 years) diagnosed with CRP who had undergone high-dose radiotherapy for prostatic cancer and who presented with rectal bleeding were included...
September 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28894992/fractional-carbon-dioxide-laser-for-the-treatment-of-facial-atrophic-acne-scars-prospective-clinical-trial-with-short-and-long-term-evaluation
#4
Gonca Elcin, Basak Yalici-Armagan
The aim of this study was to evaluate the efficacy and safety of fractional carbon dioxide laser for the treatment of acne scars. Thirty-one participants, 15 female and 16 male, whose mean age was 34.84 ± 10.94 years, were included in this prospective study. The study took place between 2012 and 2016. Participants were evaluated with the "ECCA Grading Scale" before the first session, 3 months (short-term evaluation) and 3 years after the last session (long-term evaluation). Participants received two or three treatment sessions at 4-week intervals, with a 10,600 nm fractional carbon dioxide laser with pulse energies ranging between 100 and 160 mJ, 120 spot type, 75-100 spot/cm(2) density, and 30 W power...
September 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28894956/the-effect-of-laser-power-blood-perfusion-thermal-and-optical-properties-of-human-liver-tissue-on-thermal-damage-in-litt
#5
Khalid Salem Shibib, Mohammed A Munshid, Hind Ali Lateef
In this work, the finite-element method (FEM) was used to predict the temperature distribution, and the thermal damage volume in human liver tissue subjected to laser in laser-induced interstitial thermotherapy (LITT). The effect of laser power, blood perfusion, and thermal and optical properties on maximum temperature and thermal damage volume were predicted using the finite-element method. A computer program was written in visual basic language, which was verified by comparing its result with data published elsewhere...
September 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28890988/the-changing-landscape-of-dermatology-practice-melanoma-and-pump-probe-laser-microscopy
#6
REVIEW
Charles J Puza, Paul J Mosca
To present current melanoma diagnosis, staging, prognosis, and treatment algorithms and how recent advances in laser pump-probe microscopy will fill in the gaps in our clinical understanding. Expert opinion and significantly cited articles identified in SCOPUS were used in conjunction with a pubmed database search on Melanoma practice guidelines from the last 10 years. Significant advances in melanoma treatment have been made over the last decade. However, proper treatment algorithm and prognostic information per melanoma stage remain controversial...
September 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28889348/treatment-of-erythemato-telangiectatic-rosacea-with-brimonidine-alone-or-combined-with-vascular-laser-based-on-preliminary-instrumental-evaluation-of-the-vascular-component
#7
Giuseppe Micali, Federica Dall'Oglio, Anna Elisa Verzì, Ivano Luppino, Karishma Bhatt, Francesco Lacarrubba
The purpose of this study is to evaluate the outcome of a series of patients with erythematotelangiectatic rosacea (ETR) affected by persistent erythema and varying degree of telangiectasias being treated with brimonidine alone or combined with a vascular laser based on the type of vascular components preliminarily evaluated by clinical and instrumental observation. Ten patients affected by ETR were enrolled in a pilot, open study. Instrumental evaluation included erythema-directed digital photography by VISIA-CR™ system and X10 dermoscopy...
September 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28889322/efficiency-of-soft-tissue-incision-with-a-novel-445-nm-semiconductor-laser
#8
Andreas Braun, Moritz Kettner, Michael Berthold, Johannes-Simon Wenzler, Paul Günther Baptist Heymann, Roland Frankenberger
Using a 445-nm semiconductor laser for tissue incision, an effective cut is expected due to the special absorption properties of blue laser light in soft tissues. The aim of the present study was the histological evaluation of tissue samples after incision with a 445-nm diode laser. Forty soft tissue specimens were obtained from pork oral mucosa and mounted on a motorized linear translation stage. The handpiece of a high-frequency surgery device, a 970-nm semiconductor laser, and a 445-nm semiconductor laser were connected to the slide, allowing a constant linear movement (2 mm/s) and the same distance of the working tip to the soft tissue's surface...
September 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28884244/lasers-and-intense-pulsed-light-ipl-association-with-cancerous-lesions
#9
Caerwyn Ash, Godfrey Town, Rebecca Whittall, Louise Tooze, Jaymie Phillips
The development and use of light and lasers for medical and cosmetic procedures has increased exponentially over the past decade. This review article focuses on the incidence of reported cases of skin cancer post laser or IPL treatment. The existing evidence base of over 25 years of laser and IPL use to date has not raised any concerns regarding its long-term safety with only a few anecdotal cases of melanoma post treatment over two decades of use; therefore, there is no evidence to suggest that there is a credible cancer risk...
September 7, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28875406/subretinal-fibrin-absorption-after-577-nm-subthreshold-micropulse-laser-therapy-in-a-csc-case-a-brief-report
#10
Lijun Zhou, Tao Li, Kunbei Lai, Chuangxin Huang, Fabao Xu, Zhe Zhu, Lin Lu, Chenjin Jin
No abstract text is available yet for this article.
September 5, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28866729/experimental-investigation-on-the-vascular-thermal-response-to-near-infrared-laser-pulses
#11
Dong Li, Bin Chen, Wenjuan Wu, Zhaoxia Ying
Port wine stains (PWS) are congenital vascular malformations that progressively darken and thicken with age. To improve the effect of laser therapy in clinical practice, thermal response of blood vessel to a 1064 nm Nd:YAG laser with controlled energy doses and pulse durations was evaluated using the dorsal skin chamber model. A total of 137 vessels with 30-300 μm diameters were selected from the dorsal skin of the mouse to match those capillaries in port wine stains. Experimental results showed that the thermal response of blood vessels to 1064 nm laser irradiation can be classified as follows: vessel dilation, coagulation, constriction with decreased diameter, complete constriction, hemorrhage, and collagen damage with increasing laser radiant exposure...
September 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28864923/evaluation-of-carbon-dioxide-laser-therapy-for-benign-tumors-of-the-eyelid-margin
#12
Aniko Rentka, Jan Grygar, Zoltan Nemes, Adam Kemeny-Beke
Eyelid margin tumors require special attention based on both anatomical and histological perspectives. Our aim in this study was to evaluate carbon dioxide (CO2) laser therapy for the treatment of eyelid margin tumors. Fifty-two patients with 55 eyelid margin tumors were included in this study. All tumors were removed with a CO2 laser, and histopathological evaluation was obtained in 52 cases. All patients were followed up for a mean period of 8.5 months (range 6 to 14 months). There were no bleedings in the intra- and postoperative period; the wounds were dry and reepithelized after 10-14 days and no recurrence occurred during follow-up period...
September 2, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28861729/a-preliminary-randomized-clinical-trial-comparing-diode-laser-and-scalpel-periosteal-incision-during-implant-surgery-impact-on-postoperative-morbidity-and-implant-survival
#13
Aysan Shahnaz, Raika Jamali, Farnush Mohammadi, Afshin Khorsand, Neda Moslemi, Reza Fekrazad
The aim of this preliminary randomized clinical trial was to compare: (1) post-operative morbidity after application of laser or scalpel incision for flap advancement during implant surgery and bone grafting and (2) implant survival rate following flap advancement with laser or scalpel incision after 6 months of loading. Eighteen patients who were scheduled for dental implant placement and simultaneous bone grafting were randomly assigned to test or control groups. Diode laser (810 nm, 2 W, pulse interval 200 μs; pulse length 100 μs, 400-μm initiated fiber tip), or scalpel (control) was used to sever the periosteum to create a tension-free flap...
August 31, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28840431/cdna-microarray-analysis-of-human-keratinocytes-cells-of-patients-submitted-to-chemoradiotherapy-and-oral-photobiomodulation-therapy-pilot-study
#14
Heliton S Antunes, Gabriel Wajnberg, Marcos B Pinho, Natasha Andressa Nogueira Jorge, Joyce Luana Melo de Moraes, Claudio Gustavo Stefanoff, Daniel Herchenhorn, Carlos M M Araújo, Celia Maria Pais Viégas, Mariana P Rampini, Fernando L Dias, Patricia Savio de Araujo-Souza, Fabio Passetti, Carlos G Ferreira
Oral mucositis is an acute toxicity that occurs in patients submitted to chemoradiotherapy to treat head and neck squamous cell carcinoma. In this study, we evaluated differences in gene expression in the keratinocytes of the oral mucosa of patients treated with photobiomodulation therapy and tried to associate the molecular mechanisms with clinical findings. From June 2009 to December 2010, 27 patients were included in a randomized double-blind pilot study. Buccal smears from 13 patients were obtained at days 1 and 10 of chemoradiotherapy, and overall gene expression of samples from both dates were analyzed by complementary DNA (cDNA) microarray...
August 24, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28840382/new-photobiomodulation-protocol-prevents-oral-mucositis-in-hematopoietic-stem-cell-transplantation-recipients-a-retrospective-study
#15
Camila Weissheimer, Marina Curra, Lauro J Gregianin, Liane E Daudt, Vivian P Wagner, Marco Antonio T Martins, Manoela D Martins
Oral mucositis (OM) is an adverse side effect among hematopoietic stem cell transplantation (HSCT) recipients. The objective of this retrospective study was to evaluate the preventive effect of photobiomodulation (PBM) applied three times per week versus seven times per week in patients undergoing HSCT. The risk factors related to the incidence and severity of OM were also assessed. This was a retrospective study that evaluated 99 HSCT recipients who received different PBM protocols. Group I received three sessions per week, and group II received daily treatment...
August 24, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28836013/enhanced-survival-of-ischemic-skin-flap-by-combined-treatment-with-bone-marrow-derived-stem-cells-and-low-level-light-irradiation
#16
Jeong Hwan Moon, Yun-Hee Rhee, Jin-Chul Ahn, Bongkyun Kim, Sang Joon Lee, Phil-Sang Chung
The aim of this study is to examine the enhanced survival effect of ischemic skin flap by combined treatment with bone marrow-derived stem cells (BMSCs) and low-level light irradiation (LLLI). The neovasculogenic effect of BMSCs induced by LLLI was detected using a wound healing and tube formation assay. ICR mice were divided into four groups: control group, LLLI group, BMSCs group, and combine-treated group. The percentage of skin flap necrosis area was calculated on the seventh post-operative day. Specimens were harvested for histologic analyses...
August 23, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28831631/comparison-of-the-efficacy-and-feasibility-of-laser-enucleation-of-bladder-tumor-versus-transurethral-resection-of-bladder-tumor-a-meta-analysis
#17
Huan Yang, Ning Wang, Shanfu Han, Musa Male, Chenming Zhao, Daqiang Yao, Zhiqiang Chen
The transurethral resection of bladder tumor (TURBT) remains the most widely used method in the surgical treatment of the non-muscle invasive bladder tumor (NMIBT). Despite its popularity, the laser technique has been widely used in urology as an alternative, via the application of transurethral laser enucleation of bladder tumor. The aim of the present study was to compare the efficacy and feasibility between transurethral laser enucleation and transurethral resection of bladder tumor. A systematic search of the following databases was conducted: PubMed, Wed of Science, Cochrane Library, EMBASE, Google scholar, and Medline...
August 23, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28823073/effect-of-low-level-laser-therapy-%C3%AE-780%C3%A2-nm-on-the-mechanically-damaged-dentin-pulp-complex-in-a-model-of-extrusive-luxation-in-rat-incisors
#18
Dandara Andrade de Santana, Gabriela Ferraz Fonseca, Luciana Maria Pedreira Ramalho, Tânia Tavares Rodriguez, Marcio Cajazeira Aguiar
In order to regenerate the dental pulp, many strategies have been developed as phototherapy. In the pulp repair, we do not know if gallium-aluminum-arsenide (GaAlAs) laser preserves the primary odontoblasts or stimulates the formation of more dentin matrix when dental pulp is damaged. The aim of the present study was to examine the effect of laser phototherapy (λ780 nm) on vascularization, inflammation, density of the primary odontoblast layer, and formation of reactionary and reparative dentin in the dental pulp by provoking extrusion of the rat incisor...
August 19, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28821986/comparative-analysis-of-the-effects-of-co2-fractional-laser-and-sonophoresis-on-human-skin-penetration-with-5-aminolevulinic-acid
#19
J H Choi, E J Shin, K H Jeong, M K Shin
Successful delivery of a photosensitizer into the skin is an important factor for effective photodynamic therapy (PDT). The effective method to increase drug penetration within short incubation time overcoming skin barrier have been investigated. This study was performed to analyze and compare the effectiveness of ablative fractional laser (FXL) pretreatment and/or sonophoresis for enhancing the penetration of 5-aminolevulinic acid (ALA) into human skin in vivo. Twenty-four identical 1 × 1 cm(2) treatment areas were mapped on the backs of ten healthy male subjects...
August 19, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28812167/superficial-hemangioma-is-better-treated-by-topical-5-aminolevulinic-followed-by-595-nm-pulsed-dye-laser-therapy-rather-than-595-nm-laser-therapy-alone
#20
Ming Zeng, Songke Shen, Wei Chen, Chunjun Yang, ShengXiu Liu
The aim of this study was to compare the efficacy and adverse effects of a 595-nm pulsed dye laser therapy alone (PDL alone) with a 5-aminolevulinic (5-ALA) local application followed by a 595-nm PDL (5-ALA PDL) in the treatment of superficial hemangioma (SH). A prospectively randomized study in 181 patients with SH was carried out over a period of 24 months. One hundred and ninety-three patients were seen. One hundred and eighty-one patients with SH were enrolled, of which 165 completed final follow-up. One hundred and nineteen patients received PDL alone and 46 received 5-ALA PDL...
August 16, 2017: Lasers in Medical Science
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