Letteratura scientifica selezionata sul tema "YSGG"
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Articoli di riviste sul tema "YSGG"
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Saveanu, Catalina Iulia, Oana Tanculescu, Daniela Anistoroaei, Oana Dragos, Alexandra Ecaterina Saveanu, Loredana Golovcencu, Irina Bamboi e Loredana Liliana Hurjui. "Enamel Conditioning by Phosphoric Acid and Er.Cr: YSGG Laser Irradiation - EDS and SEM Studies". Revista de Chimie 70, n. 9 (15 ottobre 2019): 3129–31. http://dx.doi.org/10.37358/rc.19.9.7501.
Testo completoAbstract (sommario):
This study evaluated the effects of ortophosforic acid and Er.Cr: YSGG LASER on human enamel by means of a field emission in-lens scanning electron microscope. The materials used for conditioning the teeth were SE�35% (Scotchbond� Etchant Phosphoric Acid) and MG6-MZ6 tips with Er, Cr: YSGG laser, 30% water, 60% air, 5.5 W/20 Hz according to manufacturer�s instructions. The acid time of action determines enamel demineralization in all situation. Er.Cr: YSGG laser treatment of non-carious enamel, a laser power of 5.5 W is found to be the optimal to improve the micromorphology of enamel.
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Furtsev, Taras Vladimirovich, A. A. Kazanovskaya e S. V. Prudnikova. "COMPARATIVE RESULTS OF ANTIBACTERIAL PROCESSING OF THE ROOT CHANNELS UNDER THE STANDARD PROTOCOL WITH USE OF HYPOCHLORITE OF SODIUM (NAOCL) AND THE LASER ER, CR: YSGG WAVE LENGTH 2780 НМ". Russian Journal of Dentistry 22, n. 4 (15 agosto 2018): 184–87. http://dx.doi.org/10.18821/1728-2802-2018-22-4-184-187.
Testo completoAbstract (sommario):
A research objective was studying of antibacterial efficiency of processing of root channels of teeth of Er, Cr: The YSGG laser with a wave length 2780 нм. 20 tests of contents of root channels before processing by the laser of different power have been investigated. Results of the conducted research prove antimicrobic efficiency of Er, Cr: YSGG of laser radiation at endodontic treatment.
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Jameel, Chener S., e Nawfal A. Zakaria. "Evaluation of Smear Layer Removal by Activation Ethylene Diamine Tetra Acetic Acid 17% with Erbium Chromium: Yttrium Scandium Gallium Garnet and Diode Laser: Scanning Electron Microscopy". Polytechnic Journal 10, n. 1 (30 giugno 2020): 103–9. http://dx.doi.org/10.25156/ptj.v10n1y2020.pp103-109.
Testo completoAbstract (sommario):
Background and Objectives: Activation of ethylene diamine tetra acetic acid (EDTA) with diode laser and Erbium Chromium: Yttrium Scandium Gallium Garnet (Er, Cr: YSGG) proposed as a promising adjuvant to conventional protocols but, its effectiveness has been seldom addressed. The purpose of this study was to evaluate the effect of laser-activated irrigations using the diode laser and the Er, Cr: YSGG laser on removing smear layer (SL) from the root canal wall. Materials and Methods: SL was generated by preparing the root canals of extracted human teeth to a #35/0.05 two shape instrument. The SL then received treatments of one of the following: Group 1, 5 ml, 5.25% NaOCl + 5 ml, 17% EDTA Each for 60 s, Group 2 5 ml, Group 2, 5.25% NaOCl 60 s + 5 ml, 17% EDTA 40 s + Diode laser 980 nm 20 s 5 ml, and Group 3, 5.25% NaOCl 60 s + 17% EDTA 35 s + Er, Cr: YSGG with RFT-2 tip for five cycles of 5 s. Results: The activation of EDTA with diode laser 980 nm shows to be most effective in the SL in the apical and coronal third could be very useful adjutant in endodontic treatment due to its compactness.
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Crippa, Rolando, Riccardo Aiuto, Mario Dioguardi, María Peñarrocha-Diago, Miguel Peñarrocha-Diago e Francesca Angiero. "Laser Therapy for Infected Sites and Immediate Dental Implants in the Esthetic Zone: A Case Report and Review of Literature". Case Reports in Dentistry 2020 (9 gennaio 2020): 1–5. http://dx.doi.org/10.1155/2020/2328398.
Testo completoAbstract (sommario):
Placement of postextraction dental implants has become a common practice. Here, we reviewed current literature, along with clinical procedures, outcomes, and incidence of complications, associated with immediate implants in infected postextraction sites. The YSGG (yttrium, scandium, gallium, and garnet) laser can significantly reduce the bacterial concentration after extracting a compromised tooth. We treated a 40-year-old woman with a compromised tooth in the esthetic zone, presenting clinical and radiological signs of infection, particularly a periapical periodontitis. The tooth was extracted after administering local anesthesia using Optocain® (mepivacaine and adrenalin 1 : 100,000), following which the site was treated with an ErCr : YSGG (erbium, chromium-doped yttrium, scandium, gallium, and garnet) 2780 nm laser device (Biolase iPlus®). The implant (Straumann® fixture) was inserted with minimum 35 N torque, 1 mm below the most apical bone peak. Bio-Oss® and resorbable membrane were applied to improve bone healing. The use of ErCr : YSGG laser has ensured success of implant therapy performed on an infected site. There were no complications such as peri-implantitis or loss of peri-implant bone. The implant achieved good primary stability, immediate placement into an infected site did not increase complications, and the 5-year follow-up confirmed the treatment success.
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Gholami, Gholam Ali, Milad Karamlou, Reza Fekrazad, Farzin Ghanavati, Neda Hakimiha e Georgios Romanos. "Comparison of the Effects of Er, Cr: YSGG Laser and Super-Saturated Citric Acid on the Debridement of Contaminated Implant Surfaces". Journal of Lasers in Medical Sciences 9, n. 4 (17 settembre 2018): 254–60. http://dx.doi.org/10.15171/jlms.2018.46.
Testo completoAbstract (sommario):
Introduction: Several techniques such as using citric acid, plastic curettes, ultrasonic devices, and lasers have been suggested for debridement of contaminated implant surfaces. This comparative investigation aimed to assess and compare the effects of Er, Cr: YSGG laser and super-saturated citric acid on the debridement of contaminated dental implant surfaces. Methods: In this in-vitro study, 12 contaminated failed implants were collected and randomly divided into 2 groups (6 in group A, and 6 in group B). Also, one implant was considered as the control. The implants were horizontally sectioned into coronal and apical portions and subsequently irradiated by Er, Cr: YSGG laser in coronal and citric acid in apical in group A and the opposite in group B. In order to evaluate the effect of water spray on the laser section, half the laser portion of the implants was irradiated using water, while the other half was irradiated without water with an irradiation time of 1 minute. Results: Results revealed that calculus and plaque removal was greater in the laser part of both groups (with and without water) compared to citric acid parts and the correlation between calculus removal and surface roughness were statistically significant. Furthermore, the surface roughness in the citric acid parts was significantly higher than in laser parts. Water spray during irradiation had a very small influence on understudy factors. Conclusion: Based on the results of this study, the Er, Cr: YSGG laser was more effective in calculus removal and caused less surface roughness compared with citric acid application.
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EVANS, JEFF. "Skin Resurface Healing Is Faster With YSGG Laser". Skin & Allergy News 39, n. 6 (giugno 2008): 29. http://dx.doi.org/10.1016/s0037-6337(08)70401-7.
Testo completo
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COULTER, ANNE H. "Erbium YSGG Laser Shows Great Promise in ENT". Journal of Clinical Laser Medicine & Surgery 12, n. 1 (febbraio 1994): 57–58. http://dx.doi.org/10.1089/clm.1994.12.57.
Testo completo
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Alikhasi, Marzieh, Abbas Monzavi, Hooman Ebrahimi, Maryam Pirmoradian, Ahmadreza Shamshiri e Rezvaneh Ghazanfari. "Debonding Time and Dental Pulp Temperature With the Er, Cr: YSGG Laser for Debonding Feldespathic and Lithium Disilicate Veneers". Journal of Lasers in Medical Sciences 10, n. 3 (6 luglio 2019): 211–14. http://dx.doi.org/10.15171/jlms.2019.34.
Testo completoAbstract (sommario):
Introduction: The removal of ceramic veneers is a time-consuming procedure in a dental office. Little research has been done in alternative removal techniques for ceramic veneers. The objective of this study was to evaluate the removal of feldspathic and lithium disilicate reinforced glass ceramic veneers by Er, Cr: YSGG and to measure debonding time and pulpal temperature increase during veneer removal. Methods: Fifty-seven bovine incisor teeth were prepared and divided into 3 groups. Ceramic specimens with a thickness of 0.7mm, a width of 4mm and a length of 8 mm were fabricated from feldspathic ceramic, lithium disilicate reinforced glass ceramic HT (high translucency) and lithium disilicate reinforced glass ceramic MO (medium opacity) (19 for each group). Specimens were cemented on the labial surface of incisors using resin cement. The Er, Cr: YSGG laser was applied to each specimen at 2.5 W and 25 Hz. Debonding time was measured for each specimen, and the intrapulpal temperature was detected in 3 specimens for each group. Data were analyzed via one-way analysis of variance (ANOVA) at significance level of 0.05 (α = 0.05). Results: Mean debonding time was 103.68 (26.76), 106.58 (47.22) and 103.84 (32.90) seconds for feldspathic, lithium disilicate MO, and lithium disilicate HT respectively. There was no significant statistical difference among the groups (P value = 0.96). The intrapulpal temperature increase was less than 1°C in all groups. Conclusion: Er, Cr: YSGG can successfully be used to efficiently debond feldspathic and lithium disilicate reinforced glass ceramic veneers. There was no significant difference for debonding time among these ceramic materials. During ceramic laminate veneer removal by laser irradiation, no irritating temperature rise was detected.
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El Mansy, Maryam M., Mostafa Gheith, Abo M. El Yazeed e Dina B. E. Farag. "Influence of Er, Cr: YSGG (2780 nm) and Nanosecond Nd: YAG Laser (1064 nm) Irradiation on Enamel Acid Resistance: Morphological and Elemental Analysis". Open Access Macedonian Journal of Medical Sciences 7, n. 11 (1 giugno 2019): 1828–33. http://dx.doi.org/10.3889/oamjms.2019.359.
Testo completoAbstract (sommario):
BACKGROUND: Enamel demineralisation is an initial step of the serious dental problem including dental caries, white spot lesions and dental erosion.
AIM: Compare the effect of Er, Cr: YSGG (λ = 2780 nm) and nanosecond Nd: YAG (λ = 1064 nm) laser on enamel acid resistance.
MATERIAL AND METHODS: Thirty non-carious human premolars, extracted for orthodontic reasons, were used. The experimental groups (n = 10 each group) were: Group I, untreated (control); Group II, Er,Cr:YSGG laser irradiation (0.75 W, 20 Hz, 140 μs, 10 s); Group III, nanosecond pulsed Nd:YAG laser irradiation (0.8 W, 10 Hz, 7 ns, 10 s). Scanning electron microscope and Energy Dispersive X-ray Spectroscopy (EDX) were used to assess acquired enamel resistance to PH cycling.
RESULTS: After subjecting the three experimental groups to PH cycling, scanning electron microscopic examination revealed irregular porous dissoluted enamel surface in group I. However, groups II and III demonstrated partially dissoluted enamel surface. EDX analysis demonstrated the lowest mean percentage decrease in calcium and phosphorus content in group II followed by group III, then the highest mean percentage decrease was observed in untreated group I. One-way ANOVA revealed significant differences (p < 0.0001) between the tested groups.
CONCLUSIONS: Both Er, Cr: YSSG and nanosecond Nd: YAG laser irradiation were able to improve the acid resistance of enamel. However, enamel surface treated with Er, Cr: YSSG laser showed the lowest mean percentage decrease of calcium and phosphorus (highest acid resistance).
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Jacboson, B., J. Berger, R. Kravitz e P. Patel. "Laser pediatric crowns performed without anesthesia: a contemporary technique". Journal of Clinical Pediatric Dentistry 28, n. 1 (1 settembre 2004): 11–12. http://dx.doi.org/10.17796/jcpd.28.1.t4v16x7757245q64.
Testo completoAbstract (sommario):
Extensive caries resulting in the need for a stainless steel crown in primary teeth may now be prepared with the use of the WaterlaseTM YSGG Laser, (Biolase®) hard and soft-tissue laser. The use of the laser eliminates the need for local anesthesia, thereby providing optimal patient comfort and compliance.
Tesi sul tema "YSGG"
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Neto, José da Silva Rabelo. "Hidroxiapatita sintética nanoestruturada e esmalte dental aquecidos e irradiados por laser de Er, Cr: YSGG: caracterização por FTIR e por DRX". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-06112009-152905/.
Testo completoAbstract (sommario):
Este estudo procurou avaliar as mudanças físicas e/ou químicas que ocorrem na hidroxiapatita (HAP) sintética e na presente no esmalte dental sob ação de aquecimento térmico em forno ou irradiação com o laser de Er,Cr:YSGG (2,79 m). Busca-se obter variações em sua estrutura a fim de torná-los mais resistentes à desmineralização, visando e prevenir a formação da cárie dental. A HAP sintética foi produzida pela reação das soluções de Ca(NO3) e (NH4)2HPO4 com controle de temperatura e pH. O esmalte foi coletado do dentes bovinos e triturados. As amostras em pó de HAP sintética e esmalte foram submetidas a aquecimento térmico em forno nas temperaturas de 200 °C, 400 °C, 600 °C, 800 °C e 1000 °C. Foram feitas irradiações laser com 5,79 J/cm2, 7,65 J/cm2, 10,55 e 13,84 J/cm2 para a HAP sintética e de 7,53 J/cm2, 10,95 J/cm2 e 13,74 J/cm2 para o esmalte. As amostras foram avaliadas por difração de raios-X(DRX) para análise das fases cristalográficas presentes e análise pelo método de Rietveld para comprovação destas fases cristalográficas e determinação de respectivas proporções no material. Foram obtidos também as variações de parâmetros de rede da cela unitária (eixo-a, eixo-c e volume), tamanho dos cristalitos e taxas de ocupações dos sítios dos átomos de Ca e P de ambos os materiais. As amostras foram ainda analisadas por espectroscopia de absorção no infravermelho por transformada de Fourier (FTIR), que mostrou as variações composicionais ocasionadas pelos tratamentos calculando-se as áreas das bandas referentes aos radicais carbonato, fosfato, água adsorvida e hidroxila. A termografia no infravermelho foi usada para medir a temperatura superficial gerada pelo feixe do laser nas amostras sólidas de esmalte. Com relação às fases cristalográficas presentes só foram encontradas além da fase majoritária de hidroxiapatita, as fases de fosfato de octacálcio (OCP) nas amostra de HAP sintética e tricálcio 9 fosfato da fase b (b -TCP) no esmalte aquecido a 800 °C. Apresentaram-se mudanças nos parâmetros de rede da cela unitária da HAP sintética e do esmalte, com diminuição do eixo-a, volume e tamanho dos cristalitos até as temperaturas entre 400 °C e 600 °C e também nas amostras irradiadas a laser. Acima da temperatura de 600 °C há o aumento destes parâmetros de rede. A relação Ca/P em todas as amostras sofreram diminuições, sendo que na amostra de esmalte irradiada a 7,53 J/cm2 apresentou Ca/P igual a 1,6817 e a irradiada a 13,74 J/cm2 apresentou Ca/P igual a 1,6831. A espectroscopia mostrou que os efeitos tanto do aquecimento como da irradiação laser podem ser observados principalmente nas bandas de carbonato, água adsorvida e hidroxila e que as mudanças da rede cristalográfica podem ser correlacionadas com substituições de carbonato em sítios de hidroxilas e fosfatos. Ambos os tratamentos causam também diminuição da concentração de carbonatos, sendo que este efeito ocorreu com maior intensidade nas irradiações a laser e houve ainda diminuição na quantidades de água adsorvida e hidroxilas. Todas estas alterações modificam as propriedades do material, como sua solubilidade e consequentemente influenciam na resistência à desmineralização de interesse para processos como prevenção da cárie dental e erosão dental.The study evaluate the physical changes and/or chemical that occurs in synthetic hydroxyapatite (HAP) and in enamel under action of thermal heating in oven or laser irradiation of Er,Cr:YSGG that may cause changes in its structure to make them more resistant to demineralization aiming the formation of dental caries. The synthetic HAP was produced by reaction of solutions of Ca(NO3) and (NH4)2HPO4 with controlled temperature and pH. The enamel powder was collected from the bovine teeth. Samples of powder enamel and synthetic HAP were subjected to thermal heating in oven at temperatures of 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. For the laser irradiation of materials, were made with 5,79 J/cm2 of irradiation, 7,65 J/cm2, 10,55 J/cm2 and 13,84 J/cm2 for synthetic HAP and 7,53 J/cm2, 10,95 J/cm2, and 13,74 J/cm2 for the enamel. The samples were evaluated by X-ray diffraction (XRD) for analysis of crystallographic phases and analysis by the Rietveld method, to determine their respective proportions in the material, as well as results of changes of the lattice unit cell parameters (axisa, axis-c and volume), crystallites sizes and the occupation rate of sites of Ca and P atoms. The samples were analyzed by Fourier transform infrared spectroscopy (FTIR), which should compositional changes due to treatment related to carbonate, phosphate, adsorbed water and hydroxyl radicals content. The infrared was used to measure the surface temperature generated by the laser beam in the solid samples of enamel. Besides the major hydroxyapatite crystallographic phases, there was formations of octacalcium phosphate (OCP) and phase of tricalcium phosphate (-TCP ) in enamel heated at 800 °C. There was reduction of the axis-a, volume and size of crystallites to the temperatures between 400 °C and 600 °C and also on laser irradiated samples. Above the temperature of 600 °C it is observed the effect in the lattice parameters. The Ca/P relation in all the samples decreased. The enamel samples irradiated by 7,53 J/cm2 showed Ca/P equal to 1,6817 and by 13,74 J/cm2 Ca/P was 1,6831. Spectroscopy results showed that both the heating and laser irradiation cause changes primarily in the bands of carbonate, water adsorbed and hydroxyl and the crystallographic changes of the lattice may be correlated with changes in carbonate in the sites of hydroxyl and phosphates. The effects of heating in oven and laser irradiation causes reduction of carbonate content, and this effect was more evident in laser irradiated samples, there was also decreases in water and adsorbed hydroxyl contents. All these changes alter the properties of the material, as its solubility and therefore affect the demineralization process and can be useful for caries prevention as well as dental erosion prevention.
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Botta, Sergio Brossi. "Influência da irradiação com laser de Er, Cr:YSGG na resistência de união de sistemas adesivos em esmalte e dentina". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-13082007-125325/.
Testo completoAbstract (sommario):
Este trabalho teve o objetivo de avaliar a resistência adesiva de sistemas adesivos baseados no condicionamento prévio com ácido fosfórico (etch-and-rinse) e auto-condicionantes (de um e dois passos) ao substrato dental, submetido a diferentes condições de irradiação com laser de Er,Cr:YSGG. Amostras de esmalte e dentina foram obtidas do terço médio da face vestibular de 216 incisivos bovinos, divididos aleatoriamente em 18 grupos (n=12), de acordo com o substrato, (esmalte e dentina), sistema adesivo (etch-and-rinse, auto-condicionante de um passo e auto-condicionante de dois passos) e condições de irradiação (sem irradiação ? controle, irradiado com refrigeração ar-água e irradiado sem refrigeração ar-água). Em seguida foi realizada inclusão e polimento, sob refrigeração, com lixas de carbeto de silício de granulação decrescente 180, 320, 400 e 600 (por um minuto para padronização da camada de esfregaço). Para os grupos irradiados com laser de Er,Cr:YSGG (?=2,79 ?m, taxa de repetição de 20 Hz), com densidade de energia de 2,8 J/cm2, 12,5 mJ por pulso, potência média de 0,25W, com a ponta S75 de diâmetro de 750 ?m a 1 mm da superfície do substrato. A condição de refrigeração da irradiação foi realizada com 11 mL/min. Os corpos-de-prova foram confeccionados com a resina composta Filtek Z250, em forma de cone invertido para realização do teste de resistência adesiva. Após 24 h de armazenagem em água destilada a 37ºC, fez-se o ensaio de tração a 0,5 mm/min. Os dados foram comparados estatisticamente pelo método de ANOVA com significância de 5%. Os resultados obtidos mostraram que para o tecido esmalte foi observada diferença estatisticamente significante para os fatores adesivo e condições de irradiação empregadas, sem significância para a interação entre os fatores. A resistência de união do sistema adesivo auto-condicionante de dois passos e do sistema adesivo etch-and-rinse apresentam desempenho semelhante, sendo superiores ao sistema adesivo auto-condicionante de passo único. Ainda para esmalte, o efeito das condições de irradiação mostrou que os grupos sem irradiação com laser de Er,Cr:YSGG apresentaram maior resistência adesiva do que os grupos irradiados com refrigeração e sem refrigeração. Para o substrato dentina, houve diferença estatisticamente significante para os fatores de variação principais: sistemas adesivos, condição de irradiação com laser de Er,Cr:YSGG e para a interação adesivo X condição de irradiação. Quanto à comparação entre os sistemas adesivos testados na condição sem irradiação, os sistemas adesivos auto-condicionantes, de dois passos e o de um passo, não foram estatisticamente diferentes entre si, porém ambos forneceram resultados de resistência adesiva estatisticamente menores do que o sistema adesivo etch-and-rinse. Para as condições de irradiação com laser de Er,Cr:YSGG, com refrigeração e sem refrigeração, obteve-se valores de resistência adesiva maiores para o sistema auto-condicionante de dois passos do que para os demais sistemas. Deste modo, conclui-se que a irradiação com laser de Er,Cr:YSGG reduz a adesão ao esmalte independentemente do sistema adesivo utilizado e da condição de irradiação. Adicionalmente, observa-se que a irradiação de dentina com laser de Er,Cr:YSGG somente não altera a resistência adesiva do sistema auto-condicionante de dois passos, sendo deletéria aos demais adesivos testados.The aim of this study was to assess the bond strength to dental substrate of adhesives based on previous etching with phosphoric acid (etch-and-rinse) and self-etching (one- and two-step) under different conditions of Er,Cr:YSGG laser irradiation. Enamel and dentin samples were obtained from the middle third of the buccal face of 216 bovine incisors, randomly divided in 18 groups (n=12), according to the substrate (enamel and dentin), adhesive system (etch-and-rinse, one-step self-etching and two-step self-etching) and irradiation condition (without irradiation ? control, irradiated with cooling, and irradiated without cooling). Next, the samples were included and polished, under cooling, with silicone carbide abrasive papers of decreasing grit #180, 320, 400 and 600 (for one minute to standardize the smear layer). For the irradiated groups with Er,Cr:YSGG laser, an energy density of 2.8 J/cm2, 12.5 mJ per pulse, mean power of 0.25W was selected. During laser irradiation, cooling was performed with 11 mL/min. Inverted cone-shaped test specimens were built-up with resin composite Filtek Z250, for performing the bond strength test. After 24 h storage in distilled water at 37ºC, the tensile test was performed at 0.5 mm/min. The results obtained show, for enamel, statistically significant difference for the factors adhesive and irradiation conditions used, without significance for the interaction among the factors. The bond strength of the 2-step self-etching and the etch-and-rinse adhesive system presented similar performance, being superior to that of one-step self-etching system. For enamel, the effect of the irradiation conditions showed that the groups without Er,Cr:YSGG laser irradiation presented higher bond strength than the groups irradiated with and without cooling. For the dentin substrate there was statistically significant difference for the main variation factors: adhesive systems, condition of Er,Cr:YSGG laser irradiation and for the interaction adhesive X irradiation condition. As regards the comparison among the adhesive systems tested under the condition without irradiation, the one-step and two-step self-etching adhesive systems did not differ statistically between them, but both provided statistically lower bond strength results than the etch-and-rinse adhesive system. For the condition of Er,Cr:YSGG laser irradiation with and without cooling, higher bond strength values were obtained for the two-step self-etching system than for the other systems. Therefore, it was concluded that Er,Cr:YSGG laser irradiation reduces the bond strength to enamel irrespective of the adhesive system used and the irradiation condition. Furthermore, it was observed that dentin irradiated with Er,Cr:YSGG laser did not alter the bond strength of the two-step adhesive system only, and it was deleterious to the other adhesives tested.
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Ana, Patricia Aparecida da. "Estudo in vitro da resistência à desmineralização e da retenção de flúor em esmalte dental irradiado com laser de Er, Cr: YSGG". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-16052007-144936/.
Testo completoAbstract (sommario):
Este estudo objetivou estabelecer condições de irradiação com o laser de Er,Cr:YSGG (de comprimento de onda de 2.79 µm) que propiciassem modificações no esmalte dental e aumentassem sua resistência à desmineralização, associadas ou não à aplicação tópica de flúor fosfato acidulado (FFA). Fluências laser de 2,8 J/cm², 5,6 J/cm² e 8,5 J/cm² foram selecionadas, as quais foram associadas com a aplicação prévia de substância fotoabsorvedora (pasta de pó de carvão) e então com aplicação de FFA posteriormente às irradiações. Inicialmente, foram avaliadas as alterações morfológicas, as modificações na temperatura superficial e os aumentos na temperatura intrapulpar decorrentes das irradiações. Posteriormente, as amostras tratadas foram submetidas a uma ciclagem de pH com duração de 10 dias. Após a produção das lesões de mancha-branca, foi avaliada a perda mineral e as quantidades de flúor fracamente ligado e fortemente ligado. Todas as soluções desmineralizantes e remineralizantes foram avaliadas com relação ao seu conteúdo de cálcio, fósforo inorgânico e flúor. Os dados foram avaliados quanto à normalidade e homogeneidade de sua distribuição para que pudesse ser escolhido o teste estatístico mais adequado, considerando o nível de significância de 5%. As fluências selecionadas promoveram superfícies ablacionadas; as fluências de 5,6 J/cm² e 8,5 J/cm² promoveram aumentos de temperatura superficial superiores a 110º C. A análise da temperatura intrapulpar revelou que as fluências escolhidas não aumentaram as temperaturas pulpares acima do limite estabelecido para pulpite. A pasta de pó de carvão não promoveu modificações morfológicas ou alterações significativas nas temperaturas pulpares; entretanto, aumentou as temperaturas superficiais durante as irradiações. Apenas a irradiação laser sob fluência de 8,5 J/cm² diminuiu significativamente a perda mineral quando comparado ao grupo sem tratamento; embora a associação da pasta de carvão + irradiação laser a 2,8 J/cm² + aplicação de FFA tenha apresentado o menor valor de perda mineral de todos os grupos de tratamento deste estudo, tal valor não diferiu estatisticamente daquele obtido quando apenas o FFA foi aplicado (grupo controle positivo). A análise de flúor fracamente ligado revelou que a irradiação laser proporcionou maior formação e retenção do fluoreto de cálcio formado após aplicação de FFA, provavelmente devido à ablação do esmalte, enquanto que a análise de flúor total mostrou não haver diferenças na quantidade de fluorapatita formada após a irradiação laser quando comparado às amostras não-irradiadas. A avaliação das soluções desmineralizantes e remineralizantes evidenciou não haver diferenças significativas nas concentrações de cálcio e fósforo inorgânico entre as amostras irradiadas ou não irradiadas; contudo, a determinação de flúor nestas soluções mostrou diferenças expressivas no conteúdo de flúor, sugerindo que a irradiação laser pode favorecer a uma maior formação de fluoreto de cálcio. De acordo com os resultados deste estudo, pode-se concluir que a irradiação laser proporciona maior retenção de fluoreto fracamente ligado formado no esmalte decorrente da aplicação tópica de flúor; entretanto, a associação dos tratamentos não proporcionou maior efeito na redução da desmineralização do esmalte do que o efeito da aplicação tópica de FFA isoladamente.This study aimed to stablish irradiation conditions of Er,Cr:YSGG laser (wavelength of 2.79 µm) which could propitiate changes on human dental enamel and increase its resistance to demineralization, when associated or not with topical application of acidulated phosphate fluoride (APF). Fluences of 2,8 J/cm², 5,6 J/cm² e 8,5 J/cm² were selected; they were associated or not with previous application of a photoabsorber (coal paste) and then APF was applied or not after laser irradiation. In a first step, the morphological findings, the surface temperatures, and the pulpal temperatures were evaluated during laser irradiation. After that, the treated samples were submitted to a a ten-day pH-cycling model. After producing the incipient white-spots lesions, the following aspects were evaluated: the mineral loss, the loosely bound fluoride and the firmly bound fluoride. All the demineralizing and remineralizing pH-cycling solutions were evaluated with respect to their calcium (Ca), inorganic phosphorous (Pi) and fluoride (F-) concentrations. The data had their normality and homogeneity distribution statistically evaluated, and it was chosen an appropriated statistical test for each performed analysis according to the obtained results, considering 5% significant level. The fluences selected for this study created ablated surfaces; the fluences of 5.6 J/cm² and 8.5 J/cm² promoted increments in surface temperature above 110º C. The intrapulpal temperature changes revealed that laser irradiation did not increase the pulpal temperatures above the critical threshold for induction of pulpitis. The coal paste did not promote any changes on surface morphology or in the intrapulpal temperature changes; however, this paste increased the surface temperatures during laser irradiation. Only laser irradiation at 8.5 J/cm² was able to decrease the mineral loss when compared to the no-treatment group; although the association of coal paste + laser at 2.8 J/cm² + APF application presented the lesser mineral loss of all treatment groups of this study, this value was not statistically different than those revealed in the FFA group (positive control). The analysis of loosely bound fluoride revealed that laser irradiation was able to retain the calcium fluoride formed after APF application due to the ablation process, while the analysis of firmly bound fluoride showed no differences in fluorapatite quantities formed after laser irradiation when compared to the non-irradiated samples. The evaluation of demineralizing and remineralizing pH-cycling solutions evidenced no significant differences in calcium or inorganic phosphorous concentrations between lased or unlased samples; however, the fluoride determination exposed important differences on fluoride contents, which suggested that laser irradiation could induce a higher calcium fluoride formation. According to the results of this study, it was possible to conclude that the laser irradiation can propitiate, on enamel, higher loosely bound fluoride retention formed by topical application of fluoride; however, the association of treatments did not increased the effect obtained by APF application alone on enamel demineralization.
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ARAUJO, MATHEUS S. de. "Estudo comparativo de temperatura e morfologia do esmalte e dentina preparados com laser de Er, Cr: YSGG ou sono-abrasão com pontas CVD: Estudo in vitro". reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11283.
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Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia)
IPEN/D-MPLO
Intituto de Pesquisas Energeticas e Nucleares, IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo
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Esteves, Jônatas Caldeira [UNESP]. "Efeito de três sistemas de osteotomia - ultrassom cirúrgico, laser Er, Cr: YSGG e sistema rotatório - sobre o processo de osseointegração e reparo de defeitos ósseos em tíbia de ratos: estudo histomorfométrico, imuno-histoquímico e biomecânico". Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/114048.
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000805961.pdf: 4843456 bytes, checksum: f128a369968d68e92229dadbd28be7df (MD5)O objetivo deste trabalho foi avaliar o processo de reparo ósseo e a osseointegração de implantes inseridos em leitos cirúrgicos preparados por meio de Brocas Convencionais, Ultrassom Piezoelétrico e LASER Er,Cr:YSGG. Como objetivo secundário, foi testada a habilidade do ultrassom cirúrgico de estumilar a liberação de citocinas e fatores de crescimento ósseo durante o processo de reparo. Para tanto, dois estudos distintos foram conduzidos. No Estudo 1, 144 ratos foram divididos em 3 grupos (Grupos Broca, LASER e Piezo) com 48 animais cada. Mini implantes usinados foram instalados em ambas as tíbias de cada animal em alvéolos cirúrgicos preparados pelos 3 sistemas testados de acordo com o grupo ao qual o animal pertencia Após a intervenção cirúrgica, 8 animais por grupo foram sacrificados aos 0, 3, 7, 14, 30 e 60 dias pós-operatórios.. O implante da tíbia direita foi utilizado para o ensaio de torque de remoção e o da tíbia esquerda, para análise de Contato-Osso-Implante (COI) e Fração de Área Ocupada por Osso (FAOO). No Estudo 2, 174 animais foram divididos nos mesmos grupos experimentais – Broca, Piezo e Laser – com 63, 63 e 48 animais cada, respectivamente. Defeitos ósseos de 2mm de diâmetro foram produzidos na tíbia direita dos animais usando um dos três dispositivos testados de acordo com o grupo ao qual o animal foi designado. Oito animais de cada grupo foram sacrificados aos 0, 3, 7, 14 30 e 60 dias e a cicatrização óssea foi analisada por histomorfometria e detecção imuno-histoquímica de Osteocalcina, Osteoprotegerina, Rankl, Vegf e Caspase-3. Cinco animais dos Grupos Broca e Piezo foram sacrificados aos 3, 7 e 14 dias e o espécimes coletados foram utilizados para análise de PCR quantitativo (Q-PCR). Os resultados do Estudo 1 demonstraram a osseointegração dos implantes no três grupos estudados. No Grupo Broca a formação óssea ocorreu mais precocemente, porém um aumento significativo no...
The aim of this study was to evaluate the bone healing process and osseointegration of implants placed in sockets prepared by conventional Drills, Piezosurgery and Er,Cr:YSGG laser. As a secondary objective we tested the hability of Piezosurgery of enhancing the bone repair by releasing of citokynes and growth factor. Therefore, two different studies were conducted. In study 1, 144 rats were assigned to 3 groups: Groups Drill, Laser and Piezo, with 48 animals in each group. Machined mini-implants were placed in both tibiae of each animal in sockets prepared by the three tested systems, according to the group in which it was assigned. After the surgical procedures, 8 animals were sacrificed postoperatively at 0, 3, 7, 14, 30 and 60 days in each group. The implant of the right tibia was used for removal torque test and the left tibia implant was used for Bone-to-Implant Contact (BIC) and Bone Area Fraction Occupancy (BAFO) analysis. In Study 2, 174 animals were ssigned to the same experimental Goups - Drill, Piezo and Laser – with 63, 63 and 48 animals in each group. Bone defects with 2mm in diameter were created in the righ tibia of each animal using one of the three tested devices according to the group in which it was assigned. Eight animals of each group was sacrificed at 0, 3, 7, 14 , 30 and 60 days and bone healing were analyzed by means of histomorphometry and immunohistochemical detection of Osteocalcin, Osteoprotegerin, Rankl, Vegf and Caspase-3. Also, 5 animals form Gorups Drill and Piezo were sacrificed at 3, 7 and 14 days and the bone samples were used for quantitative PCR (Q-PCR) analysis. Results of Study 1 demonstrated implant osseointegration in all experimental groups. The Group Drill presented early bone formation, however, significant increasing in torque removal values occurred only at 30 days. In Groups Laser and Piezo, removal torque increased early and bone healing around the implant was progressively increased until...
6
Esteves, Jônatas Caldeira. "Efeito de três sistemas de osteotomia - ultrassom cirúrgico, laser Er, Cr: YSGG e sistema rotatório - sobre o processo de osseointegração e reparo de defeitos ósseos em tíbia de ratos : estudo histomorfométrico, imuno-histoquímico e biomecânico /". Araraquara, 2014. http://hdl.handle.net/11449/114048.
Testo completoAbstract (sommario):
Orientador: Elcio Marcantonio JuniorBanca: Roberto Henrique Barbeiro
Banca: Wilson Roberto Poi
Banca: Thalita Pereira Queiroz
Banca: Paulo Tambasco de Oliveira
Resumo: O objetivo deste trabalho foi avaliar o processo de reparo ósseo e a osseointegração de implantes inseridos em leitos cirúrgicos preparados por meio de Brocas Convencionais, Ultrassom Piezoelétrico e LASER Er,Cr:YSGG. Como objetivo secundário, foi testada a habilidade do ultrassom cirúrgico de estumilar a liberação de citocinas e fatores de crescimento ósseo durante o processo de reparo. Para tanto, dois estudos distintos foram conduzidos. No Estudo 1, 144 ratos foram divididos em 3 grupos (Grupos Broca, LASER e Piezo) com 48 animais cada. Mini implantes usinados foram instalados em ambas as tíbias de cada animal em alvéolos cirúrgicos preparados pelos 3 sistemas testados de acordo com o grupo ao qual o animal pertencia Após a intervenção cirúrgica, 8 animais por grupo foram sacrificados aos 0, 3, 7, 14, 30 e 60 dias pós-operatórios.. O implante da tíbia direita foi utilizado para o ensaio de torque de remoção e o da tíbia esquerda, para análise de Contato-Osso-Implante (COI) e Fração de Área Ocupada por Osso (FAOO). No Estudo 2, 174 animais foram divididos nos mesmos grupos experimentais - Broca, Piezo e Laser - com 63, 63 e 48 animais cada, respectivamente. Defeitos ósseos de 2mm de diâmetro foram produzidos na tíbia direita dos animais usando um dos três dispositivos testados de acordo com o grupo ao qual o animal foi designado. Oito animais de cada grupo foram sacrificados aos 0, 3, 7, 14 30 e 60 dias e a cicatrização óssea foi analisada por histomorfometria e detecção imuno-histoquímica de Osteocalcina, Osteoprotegerina, Rankl, Vegf e Caspase-3. Cinco animais dos Grupos Broca e Piezo foram sacrificados aos 3, 7 e 14 dias e o espécimes coletados foram utilizados para análise de PCR quantitativo (Q-PCR). Os resultados do Estudo 1 demonstraram a osseointegração dos implantes no três grupos estudados. No Grupo Broca a formação óssea ocorreu mais precocemente, porém um aumento significativo no...
Abstract: The aim of this study was to evaluate the bone healing process and osseointegration of implants placed in sockets prepared by conventional Drills, Piezosurgery and Er,Cr:YSGG laser. As a secondary objective we tested the hability of Piezosurgery of enhancing the bone repair by releasing of citokynes and growth factor. Therefore, two different studies were conducted. In study 1, 144 rats were assigned to 3 groups: Groups Drill, Laser and Piezo, with 48 animals in each group. Machined mini-implants were placed in both tibiae of each animal in sockets prepared by the three tested systems, according to the group in which it was assigned. After the surgical procedures, 8 animals were sacrificed postoperatively at 0, 3, 7, 14, 30 and 60 days in each group. The implant of the right tibia was used for removal torque test and the left tibia implant was used for Bone-to-Implant Contact (BIC) and Bone Area Fraction Occupancy (BAFO) analysis. In Study 2, 174 animals were ssigned to the same experimental Goups - Drill, Piezo and Laser - with 63, 63 and 48 animals in each group. Bone defects with 2mm in diameter were created in the righ tibia of each animal using one of the three tested devices according to the group in which it was assigned. Eight animals of each group was sacrificed at 0, 3, 7, 14 , 30 and 60 days and bone healing were analyzed by means of histomorphometry and immunohistochemical detection of Osteocalcin, Osteoprotegerin, Rankl, Vegf and Caspase-3. Also, 5 animals form Gorups Drill and Piezo were sacrificed at 3, 7 and 14 days and the bone samples were used for quantitative PCR (Q-PCR) analysis. Results of Study 1 demonstrated implant osseointegration in all experimental groups. The Group Drill presented early bone formation, however, significant increasing in torque removal values occurred only at 30 days. In Groups Laser and Piezo, removal torque increased early and bone healing around the implant was progressively increased until...
Doutor
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Holmes, Sean. "Design, construction, and characterization of the ysgr minimal codon fab library for chaperone-assisted rna crystallography". Honors in the Major Thesis, University of Central Florida, 2012. http://purl.fcla.edu/fcla/etd/CFH0004167.
Testo completoAbstract (sommario):
Of the entire human genome, 90% of all genetic information is transcribed but only a fraction of that subsequent RNA is translated into proteins. RNAs which are not translated into proteins are deemed non-coding RNAs. Little is known about this large category of noncoding RNAs, although they perform a variety of functions within the cell. RNA crystallography is used to study RNA tertiary structure, which gives insight to the function of these non-coding RNAs. However, complications associated with RNA crystallography arise due to RNA's lack of surface functional group diversity, flexible tertiary structure, and conformational heterogeneity. A novel technique, Chaperone-assisted RNA crystallography (CARC), can greatly improve the success in crystallization of RNA. With this technique, synthetic antibodies called Antigen Binding Fragments (Fabs) are employed as crystallization chaperones to promote the structure elucidation of certain target RNAs. To identify Fabs that complex with RNA molecules of interest, we constructed a randomized library of synthetic antibodies enriched in ligand binding regions with tyrosine, serine, glycine, and arginine residues. This Fab protein library was constructed with a minimal codon design, and then screened against a variety of RNA targets. Several Fabs have been identified and isolated through phage display selection against three RNA targets. These Fabs were expressed and biochemically characterized for their binding affinities and specificities. To date, five Fabs have been identified and they have outstanding capabilities in binding their specific RNA antigen.B.S.;
Bachelors;
Burnett School of Biomedical Sciences
Molecular and Microbiology
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Revells, Tristan Edward. "Mobilizing Microbes: The Path to China’s First Renewable Energy Industry, 1892-1946". Thesis, 2021. https://doi.org/10.7916/d8-ysmg-zr21.
Testo completoAbstract (sommario):
China is a leading producer of alternative energy in the present day, while much of its economic rise under the CCP in the late 20th century was driven by the successful development of domestic coal and gas resources in the 1960s and 70s. But the drive to secure autonomous sources of energy to propel economic development and protect national security well predates China’s transition to socialism at midcentury. This dissertation explores the emergence of technocratic state rule in 20th century China by investigating the development of a biofuel industry designed to ensure energy security during war with imperial Japan. During the early to mid-1930s, Chiang Kai-Shek’s KMT government began supporting scientific research on ethanol-based biofuel production as a means of preserving fuel supplies should Japanese forces successfully blockade supply routes into the country during wartime. As exactly this scenario came to pass in the late 1930s, a network of more than 100 private and state-run ethanol plants were constructed along new roadways spanning the country’s southwestern interior. By 1945, millions of gallons a year of ethanol-based “dongli jiujing” fueled the logistical chains of both Chinese and US troops stationed throughout the China theater.
The fusion of statecraft and science manifested in the dongli jiujing program both points forward to state-led energy and heavy industrial development in the 1950s and 1960s under Mao’s CCP, and represents one of the top accomplishments of KMT agencies like the National Resources Commission, a powerful technocratic agency which held up the wartime biofuel industry as a paradigmatic example of successful state-led economic development. While scholarship on heavy industry in China often focuses on the latter half of the 20th century, this dissertation demonstrates that by the mid 1930s, the development of the biofuel industry welded political visions for a sovereign, industrially powerful China with the technical expertise of chemists and microbiologists at the National Bureau of Industrial Research (NBIR), a state funded institution for applied science research oriented at developing heavy industries. And it points out that many of the scientists involved in the dongli jiujing program would continue development work in fields like agricultural chemistry and the biochemical industry under the CCP.
Engaging with and contributing to recent scholarship on the history of science and technology in Asia, “Mobilizing Microbes” also traces the global circulation of fermentation-related knowledge that informed NBIR attempts to harness microbial life for the industrial production of alcohol. And finally, it explores connections that brought together in unexpected ways the craft knowledge and practices of China’s domestic brewing industry with modernizing visions for a powerful, fully sovereign China propounded by scientists and statesmen as the midpoint of the 20th century drew near.
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Chung-ChingWang e 王鐘慶. "YSGM: an integrative repository of diverse biological features for mining similar genes in yeast". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/x8tu4j.
Testo completoAbstract (sommario):
碩士國立成功大學
電機工程學系
102
Investigating gene similarity can be used in understanding the relations of genes in biological processes. Determining similar genes by calculating the similarity between them can substantially improve knowledge of biological behavior. Moreover, interpret biological processes participated by similar genes, and in turn, predicts similar mechanisms in other species. Previous related studies of similar genes have primarily concentrated on the association of biological function in cross species. However, few studies have thoroughly investigated the resemblance between genes which exist in the same species, such as yeast. Although several databases and web tools exist, they have not collected adequate databases about yeast or considered various conditions of yeast mechanisms. Therefore, we developed a web tool YSGM (Yeast Similar Genes Miner) that intends to fully represent similarity between yeast genes and exploited more distinctive data to explore yeast similar genes. Here we have integrated various databases which involve protein-protein interaction, genetic interaction, transcription factor(TF)-gene binding pairs, TF-gene regulatory pairs, expression profiles, mutant phenotypes, functional description, and literature evidence. And then, we have used hypergeometric test to calculate the score of gene similarity in seven biological data including protein-protein interactions, genetic interactions, TF-gene binding pairs, TF-gene regulatory pairs, mutant phenotypes, functional descriptions and evidences from the literature, and retrieved and scaled the correlation score from the result of Hibbs et al., who identified similar gene expression profiles between yeast genes and developed serial pattern of expression levels locator(SPELL), as the similarity score of expression profiles of yeast. Subsequently, we combined these similarity scores as the similarity score. Through giving a yeast gene of interest, choosing specific gene similarity features and measuring yeast gene similarity, YSGM can extract similar yeast genes for specified yeast genes under different gene similarity features. In this study, we presented the YSGM database that provides unique biological information for searching similar yeast genes. Furthermore, investigating yeast similarity with YSGM can obtain correct and complete prediction of similar genes of yeast because the biological information in YSGM including many aspects of biological behavior and evidence such as TF-gene binding, TF-gene regulatory and mutant phenotypes for querying similar yeast genes are more distinctive than other database. We believe that the diversity of biological information accumulated in YSGM will drastically enhance the usefulness of data for yeast biologists to study similarity between yeast genes.
Capitoli di libri sul tema "YSGG"
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"Carbon Dioxide Laser Resurfacing, Fractionated Resurfacing and YSGG Resurfacing". In Clinical Procedures in Laser Skin Rejuvenation, 27–40. CRC Press, 2007. http://dx.doi.org/10.1201/b14461-6.
Testo completo
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Mi, Eun, Sungyoon Huh, Duck Su, Sun-Young Kim, Su-Jin Ahn, Kyung Lhi e Sang Hyuk. "Effect of the Er, Cr: YSGG Laser Parameters on Shear Bond Strength and Microstructure on Human Dentin Surface". In Biomaterials - Physics and Chemistry. InTech, 2011. http://dx.doi.org/10.5772/24931.
Testo completo
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McLean, Robert. "Rediscovering Scottish Gangs: Towards a Typology". In Gangs, Drugs and (Dis)Organised Crime, 79–114. Policy Press, 2019. http://dx.doi.org/10.1332/policypress/9781529203028.003.0004.
Testo completoAbstract (sommario):
This chapter explores gang evolution and presents findings from original, and follow up, data via participant voices. To achieve the chapters, purpose a typology explaining gang organisation, situated on a shifting continuum, is presented. The typology explains how although gangs may evolve, it is by no means a given that most will do so: in fact few actual do. The chapter then proceeds to explore gang structures and organisational properties, presented in the typology given. The headings within correspond to the typology which outlines three main stages of development as: young street gangs (YSGs); Young Criminal Gangs (YCGs); and Organised Crime Gangs (OCGs). The focus of this chapter is to explore structure, formation, and organisation as opposed to detailing any specific type of gang activity.
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McLean, Robert. "Gangs and Drug Supply". In Gangs, Drugs and (Dis)Organised Crime, 143–74. Policy Press, 2019. http://dx.doi.org/10.1332/policypress/9781529203028.003.0006.
Testo completoAbstract (sommario):
While chapter 4 sought to explore organisational and structural properties, chapter 5 sought to provide a generic and largely descriptive account of gang activities sin relation to level of gang organisation. Chapter 6 looks to build upon structure and activity by specifically focusing upon one, and the main, type of activity in which gangs are found to operate within. This is illegal drug supply. By doing so chapter 6 adds the relevance of context to the book discussion. The chapter opens by re-examining the supply of illegal drugs into the British Isles, and more specifically the research context (i.e. Scotland). The chapter then proceeds to outline how drug supply works in relation to context and specific level of gang organisation. YSGs are found to mainly be engaged in the social supply of drugs. YCGs are found to be involved anywhere between retail-level and wholesale drug supply. OCGs are found to be involved in importation and high-end wholesaling of drugs in the county. In addition, OCGs are also found to engage in illegal-governance and thus control to varying degrees the activities of lesser gang types within drug markets.
Atti di convegni sul tema "YSGG"
1
Klimov, L. V., I. A. Shcherbakov e V. B. Tsvetkov. "Room Temperature 2-μm Laser Action of Ho3+-Doped YSGG, GSAG, YSAG, and YAG Crystals". In Advanced Solid State Lasers. Washington, D.C.: OSA, 1993. http://dx.doi.org/10.1364/assl.1993.ml7.
Testo completo
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Klimov, L. V., I. A. Shcherbakov e V. B. Tsvetkov. "Cr4+:YSGG-Passive Q-Switch for Multispikes Nd-Lasers". In Advanced Solid State Lasers. Washington, D.C.: OSA, 1993. http://dx.doi.org/10.1364/assl.1993.tl9.
Testo completo
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Zavartsev, Yu D., A. A. Zagumennyi, V. V. Osiko, P. A. Studenikin, I. A. Shcherbakov e A. F. Umyskov. "Laser operation and spectroscopy of Cr3+:Yb3+:Ln3+:YSGG." In Advanced Solid State Lasers. Washington, D.C.: OSA, 1996. http://dx.doi.org/10.1364/assl.1996.il11.
Testo completo
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Aretz, H. Thomas, John R. Butterly, Edward R. Jewell, Suzanne E. Setzer e Stanley M. Shapshay. "Effects Of Holmium-YSGG Laser Irradiation On Arterial Tissue: Preliminary Results". In OE/LASE '89, a cura di Abraham Katzir. SPIE, 1989. http://dx.doi.org/10.1117/12.952112.
Testo completo
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Yu, Lili, Qi Lin, Xianzeng Zhang, Zhenlin Zhan, Shi Lin e Shusen Xie. "Morphological analysis of dentin tissue after Er, Cr: YSGG laser irradiation". In Photonics and Optoelectronics Meetings 2009, a cura di Qingming Luo, Lihong V. Wang, Valery V. Tuchin, Pengcheng Li e Ling Fu. SPIE, 2009. http://dx.doi.org/10.1117/12.843629.
Testo completo
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Sardar, Dhiraj K., William M. Bradley, Raylon M. Yow, John B. Gruber e Bahram Zandi. "Optical transitions and absorption intensities of Dy3+ (4f9) in Y3Sc2Ga3O12 (YSGG) host". In Frontiers in Optics. Washington, D.C.: OSA, 2003. http://dx.doi.org/10.1364/fio.2003.thx5.
Testo completo
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Noginov, M. A., N. Kukhtarev, N. E. Noginova, H. J. Caulfield, P. Venkateswarlu e M. Mahdi. "Photoconductivity and Electro-Motive Force Study of Rare Earth Doped YSGG Laser Crystals". In Advanced Solid State Lasers. Washington, D.C.: OSA, 1996. http://dx.doi.org/10.1364/assl.1996.pm10.
Testo completo
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Shen, Benjian, Hongxiang Kang, Liang Jie, Chen Peng e Huaixiu Fu. "Research on laser diode end-pumped Er:YSGG/YSGG composited crystal at 2.79 μm". In International Symposium on Optoelectronic Technology and Application 2014, a cura di Guofan Jin, Songlin Zhuang e Jennifer Liu. SPIE, 2014. http://dx.doi.org/10.1117/12.2070660.
Testo completo
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Zverev, Petr G., Yulia V. Kerv, Veronika G. Ivanova, Anatoly A. Sirotkin, Alexander A. Zagumennyi, Evgenii M. Gavrishchuk e Igor G. Kononov. "Three-micron Cr3+Yb3+Ho3+:YSGG laser passively Q-switched by Fe2+:ZnSe crystal". In 2017 Conference on Lasers and Electro-Optics Europe (CLEO/Europe) & European Quantum Electronics Conference (EQEC). IEEE, 2017. http://dx.doi.org/10.1109/cleoe-eqec.2017.8086246.
Testo completo
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Gill, Jennifer, Maher Salloum e Liang Zhu. "Improvement of Root Canal Disinfection Protocol Using Er;Cr:YSGG Laser: Theoretical Study of Temperature Distribution in Human Dentin". In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19149.
Testo completoAbstract (sommario):
There has been a great deal of interest regarding the use of Er;Cr;YSGG laser heating to disinfect human root canal, prior to a root canal procedure. Current disinfection procedures rely on irrigant solutions, such as sodium hypochlorite, which are applied to the canal prior to filling. However, prior experimentation has shown that bacteria are capable of penetrating into the dentin tubules as far as 800 μm, measured laterally from the root canal surface [Haapasalo and Orstavik 1987; Kakoli et al., 2009]. Further studies have proven that irrigants are incapable of destroying bacteria within deep dentin tubules, despite their ability to kill approximately 98% of the bacteria within the canal.