Academic literature on the topic 'Air abrasion'
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Journal articles on the topic "Air abrasion"
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Hays, D. Alan. "AIR-ABRASION TREATMENT." Journal of the American Dental Association 132, no. 11 (November 2001): 1502–3. http://dx.doi.org/10.14219/jada.archive.2001.0072.
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Tan, Melissa H. X., Robert G. Hill, and Paul Anderson. "Comparing the Air Abrasion Cutting Efficacy of Dentine Using a Fluoride-Containing Bioactive Glass versus an Alumina Abrasive: AnIn VitroStudy." International Journal of Dentistry 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/521901.
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Air abrasion as a caries removal technique is less aggressive than conventional techniques and is compatible for use with adhesive restorative materials. Alumina, while being currently the most common abrasive used for cutting, has controversial health and safety issues and no remineralisation properties. The alternative, a bioactive glass, 45S5, has the advantage of promoting hard tissue remineralisation. However, 45S5 is slow as a cutting abrasive and lacks fluoride in its formulation. The aim of this study was to compare the cutting efficacy of dentine using a customised fluoride-containing bioactive glass Na0SR (38–80 μm) versus the conventional alumina abrasive (29 μm) in an air abrasion set-up. Fluoride was incorporated into Na0SR to enhance its remineralisation properties while strontium was included to increase its radiopacity. Powder outflow rate was recorded prior to the cutting tests. Principal air abrasion cutting tests were carried out on pristine ivory dentine. The abrasion depths were quantified and compared using X-ray microtomography. Na0SR was found to create deeper cavities than alumina (p<0.05) despite its lower powder outflow rate and predictably reduced hardness. The sharper edges of the Na0SR glass particles might improve the cutting efficiency. In conclusion, Na0SR was more efficacious than alumina for air abrasion cutting of dentine.
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Milly, H., RS Austin, I. Thompson, and A. Banerjee. "In Vitro Effect of Air-abrasion Operating Parameters on Dynamic Cutting Characteristics of Alumina and Bio-active Glass Powders." Operative Dentistry 39, no. 1 (January 1, 2014): 81–89. http://dx.doi.org/10.2341/12-466-l.
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SUMMARY Minimally invasive dentistry advocates the maintenance of all repairable tooth structures during operative caries management in combination with remineralization strategies. This study evaluated the effect of air-abrasion operating parameters on its cutting efficiency/pattern using bio-active glass (BAG) powder and alumina powder as a control in order to develop its use as a minimally invasive operative technique. The cutting efficiency/pattern assessment on an enamel analogue, Macor, was preceded by studying the powder flow rate (PFR) of two different commercial intraoral air-abrasion units with differing powder-air admix systems. The parameters tested included air pressure, powder flow rate, nozzle-substrate distance, nozzle angle, shrouding the air stream with a curtain of water, and the chemistry of abrasive powder. The abraded troughs were scanned and analyzed using confocal white light profilometry and MountainsMap surface analysis software. Data were analyzed statistically using one-way and repeated-measures analysis of variance tests (p=0.05). The air-abrasion unit using a vibration mechanism to admix the abrasive powder with the air stream exhibited a constant PFR regardless of the set air pressure. Significant differences in cutting efficiency were observed according to the tested parameters (p<0.05). Alumina powder removed significantly more material than did BAG powder. Using low air pressure and suitable consideration of the effect of air-abrasion parameters on cutting efficiency/patterns can improve the ultraconservative cutting characteristics of BAG air-abrasion, thereby allowing an introduction of this technology for the controlled cleaning/removal of enamel, where it is indicated clinically.
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Mandinic, Zoran, Zoran Vulicevic, Milos Beloica, Ivana Radovic, Jelena Mandic, Momir Carevic, and Jasmina Tekic. "The application of air abrasion in dentistry." Srpski arhiv za celokupno lekarstvo 142, no. 1-2 (2014): 99–105. http://dx.doi.org/10.2298/sarh1402099m.
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One of the main objectives of contemporary dentistry is to preserve healthy tooth structure by applying techniques of noninvasive treatment. Air abrasion is a minimally invasive nonmechanical technique of tooth preparation that uses kinetic energy to remove carious tooth structure. A powerful narrow stream of moving aluminum-oxide particles hit the tooth surface and they abrade it without heat, vibration or noise. Variables that affect speed of cutting include air pressure, particle size, powder flow, tip?s size, angle and distance from the tooth. It has been proposed that air abrasion can be used to diagnose early occlusal-surface lesions and treat them with minimal tooth preparation using magnifier. Reported advantages of air abrasion include reduced noise, vibration and sensitivity. Air abrasion cavity preparations have more rounded internal contours than those prepared with straight burs. This may increase the longevity of placed restorations because it reduces the incidence of fractures and a consequence of decreased internal stresses. However, air abrasion cannot be used for all patients, i.e. in cases involving severe dust allergy, asthma, chronic obstructive lung disease, recent extraction or other oral surgery, open wounds, advanced periodontal disease, recent placement of orthodontic appliances and oral abrasions, or subgingival caries removal. Many of these conditions increase the risk of air embolism in the oral soft tissues. Dust control is a challenge, and it necessitates the use of rubber dam, high-volume evacuation, protective masks and safety eyewear for both the patient and the therapist.
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Rainey, J. Tim. "MICRO-AIR-ABRASION DENTISTRY." Journal of the American Dental Association 131, no. 12 (December 2000): 1672–73. http://dx.doi.org/10.14219/jada.archive.2000.0104.
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Snaer, William R. "MORE ON AIR ABRASION." Journal of the American Dental Association 132, no. 11 (November 2001): 1503–4. http://dx.doi.org/10.14219/jada.archive.2001.0074.
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Hoopingarner, C. R., and Donald Coluzzi. "LASERS AND AIR ABRASION." Journal of the American Dental Association 141, no. 7 (July 2010): 831. http://dx.doi.org/10.14219/jada.archive.2010.0272.
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Forcella, Frank. "Soybean Seedlings Tolerate Abrasion from Air-Propelled Grit." Weed Technology 27, no. 3 (September 2013): 631–35. http://dx.doi.org/10.1614/wt-d-12-00192.1.
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New tools for controlling weeds would be useful for soybean production in organic systems. Air-propelled abrasive grit is one such tool that performs well for in-row weed control in corn, but crop safety in soybean is unknown. Responses to abrasion by corn-cob grit of soybean seedlings were examined at VE, VC, VU, V1, V2 (emergence, cotyledon, unifoliate, first trifoliate, and second trifoliate, respectively) and combinations of these growth stages, in both greenhouse and field settings. Seedling leaf areas and dry weights in greenhouse experiments were reduced by treatments that included abrasion at VC, with the primary effect expressed through reductions in the size of the unifoliate leaf. In the field, soybean stand also was reduced by grit applications at VC, especially if followed by a second application at VU or V1. However, soybean yield was not reduced by grit applied at any soybean stage of growth. End-of-season weed dry weights did not differ from hand-weeded checks, and weeds did not impact soybean yields. Thus, abrasive grit for in-row weed control can be applied at least twice at VE through V2 growth stages without lowering soybean yield, but applications at VC probably should be avoided.
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Hamilton, James C., and Joseph B. Dennison. "AIR-ABRASION TREATMENT: Authors' response." Journal of the American Dental Association 132, no. 11 (November 2001): 1503. http://dx.doi.org/10.14219/jada.archive.2001.0073.
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Forcella, Frank. "Air-Propelled Abrasive Grit for Postemergence In-Row Weed Control in Field Corn." Weed Technology 26, no. 1 (March 2012): 161–64. http://dx.doi.org/10.1614/wt-d-11-00051.1.
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Organic growers need additional tools for weed control. A new technique using abrasive grit propelled by compressed air was tested in field plots. Grit derived from corncobs was directed at seedlings of summer annual weeds growing at the bases of corn plants when the corn was at differing early stages of leaf development. Season-long, in-row weed control exceeded 90% when two or three abrasion events were coupled with between-row cultivation. Timing of weed abrasion was critical, with highest levels of control corresponding to the one- and five-leaf stages or the one-, three-, and five-leaf stages of corn development. Corn yields associated with these treatments were equivalent to those of hand-weeded controls in which no abrasive grit was applied. Thus, air-propelled abrasive grit applications at the one-, three-, and five-leaf stages of corn controlled weeds sufficiently to prevent weed-induced reductions in corn grain. Additionally, these applications were not harmful to corn plants. This new concept for weed control may be of interest to organic crop managers.
Dissertations / Theses on the topic "Air abrasion"
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Milly, Hussam. "The physico-chemical characterisation of bioactive glass air-abrasion on human enamel." Thesis, King's College London (University of London), 2014. http://kclpure.kcl.ac.uk/portal/en/theses/the-physicochemical-characterisation-of-bioactive-glass-airabrasion-on-human-enamel(93206812-6ff0-456b-8d10-4b9fc31a960a).html.
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Objectives: This research aimed to characterise the physico-chemical interaction of bioactive glass 45S5 (BAG) air-abrasion with human enamel including the controlled and selective removal of substrates and the remineralisation of enamel white spot lesions (WSLs). Materials and methods: The effect of six operating parameters on air-abrasion dynamic cutting efficiency/patterns was assessed using an enamel analogue material (MacorTM) and white light profilometry. Standardised resin composite restorations created within MacorTM blocks, were removed in simulated clinical conditions and scanned using triangulation laser profilometry to investigate the effect of operating parameters on the selective resin composite removal using BAG air-abrasion. The remineralisation of artificial enamel WSLs treated using BAG mixtures were evaluated using Raman micro-spectroscopy, microhardness and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectrometry (EDX). The physical and optical changes in WSLs pre-conditioned using air-abrasion with BAG-polyacrylic acid (PAA-BAG) powder were detected using non-contact profilometry and optical coherence tomography (OCT). All comparisons were considered statistically significant if p < 0.05. Results: Significant differences in air-abrasion cutting efficiency / pattern were observed according to the tested parameters. BAG air-abrasion removed resin composite more selectively than conventional alumina air-abrasion and the effect of altering the unit’s operating parameters was significant. Enamel WSLs treated with BAG mixtures exhibited a significantly higher Knoop microhardness compared to the negative control. Raman micro-spectroscopy detected significantly higher phosphate content and the SEM images revealed mineral depositions on the surface of treated lesions. Pre-conditioning WSL surfaces with PAA-BAG air-abrasion increased WSL surface area. This pre-treatment increased Knoop microhardness and the mineral content of remineralised WSLs. Conclusions: The ultraconservative clinical applications of BAG air-abrasion can be improved by altering the operating parameters. BAG and PAA-BAG can remineralise enamel WSLs. Pre-conditioning the lesion surface with PAA-BAG air-abrasion modifies the lesion surface physically and consequently enhances remineralisation using BAG 45S5 therapy.
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Martins, Samira Branco. "Influência do tamanho da partícula, do jateamento prévio à sinterização e do envelhecimento na resistência mecânica de uma zircônia estabilizada por ítria." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/155943.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Pouco se sabe sobre o efeito do jateamento pré-sinterização da zircônia na sua resistência mecânica, sob condições de envelhecimento. Este estudo avaliou a influência do tamanho da partícula, do momento do jateamento e do envelhecimento na resistência mecânica de uma zircônia estabilizada por ítria. Quatrocentos discos de uma zircônia estabilizada por ítria pré-sinterizados foram alocados como segue: sem jateamento; jateamento com partículas de óxido de alumínio (Al2O3) de 50 µm ou 120 µm antes (50/PRÉ ou 120/PRÉ) ou após (50/PÓS ou 120/PÓS) sua sinterização. Os discos foram não envelhecidos (24h) ou envelhecidos por: ciclagem mecânica (CM); envelhecimento hidrotérmico (EH) ou CM+EH, totalizando 20 grupos (n=20). Os espécimes foram submetidos ao teste de resistência à flexão biaxial (RFB) e, posteriormente, foram analisados fractograficamente. A análise de difração de raios-X (DRX) foi realizada em determinadas condições para caracterizar cristalograficamente o efeito do jateamento na zircônia. Os dados de RFB (MPa) foram analisados por ANOVA a 3 fatores e pós teste de Games Howell (α=0,05). Também foi realizada análise de Weibull. A RFB e a resistência característica (σ0) dos grupos 120/PÓS, envelhecidos ou não, foram significativamente maiores que as dos demais grupos jateados, e estatisticamente similares ou maiores que as dos respectivos grupos sem jateamento. Em contrapartida, o grupo 120/PRÉ/não envelhecido e todos os grupos 50/PRÉ apresentaram os menores valores. Em todos os grupos, o defeito inicial se originou na superfície submetida à tração. Nem o jateamento, nem o envelhecimento (exceto o grupo 50/PÓS/CM+EH) reduziram a confiabilidade da zircônia em relação à dos respectivos grupos controles. O jateamento promoveu um aumento do conteúdo de fase monoclínica, enquanto a sinterização zerou essa fase. O jateamento da zircônia antes da sinterização teve pior desempenho para RFB em comparação ao realizado após sua sinterização, sob os meios de envelhecimentos. A RFB e σ0 foram fortemente determinadas pelo tamanho da partícula e pelo momento do jateamento, enquanto o envelhecimento agiu apenas quando a zircônia foi jateada antes da sinterização.
Little is known about the effect of air-abrasion before zirconia sintering on its strength, under aging challenge. This study aimed to verify the influence of the air-abrasion moment (before or after zirconia sintering), particle size (50 or 120 μm) and aging on the mechanical strength of a Y-TZP ceramic. Four hundred pre-sintered zirconia discs were allocated as follows: non-air-abraded; air-abraded with 50 μm or 120 μm Al2O3 particles before (50/BS or 120/BS) or after sintering (50/AS or 120/AS). The discs were non-aged (24h) or aged by: mechanical cycling (MC); hydrothermal aging (HA) or by both methods (MC+HA), totaling 20 groups (n=20). Specimens were subjected to biaxial flexural strength test (BFS). Fractographic analysis was performed to identify the fracture origin. The X-ray diffraction analysis (XRD) was performed under certain conditions to characterize the crystallographic effect of air-abrasion on the zirconia. The BFS data (MPa) were analyzed by ANOVA and Games Howell post hoc test (α=.05). Weibull statistics was also applied. The BFS and the characteristic resistance (σ0) of the 120/AS groups, aged or not, were significantly higher than those of the other air-abraded groups, and statistically similar or higher than the respective groups without air-abrasion. In contrast, the 120/BS/non-aged group and all those 50/BS presented the lowest values. In all groups, the initial defect had its origin on the tensile stress side. Neither air-abrasion nor aging (except for 50/AS/MC+HA) reduced the zirconia reliability compared with the respective controls. Air-abrasion promotes an increase in the monoclinic phase content, while sintering zeroed this phase. Air-abrasion before zirconia sintering yields worse performance for BFS than after sintering, under aging challenges. The BFS and σ0 were strongly determined by the particle size and air-abrasion moment, while aging acted only when the zirconia was air-abraded before sintering.
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Katz, Elliott. "Effect of Air-abrasion Preparation on Shear Bond Strength of Orthodontic Brackets to Enamel Surface." Thesis, NSUWorks, 2018. https://nsuworks.nova.edu/hpd_cdm_stuetd/75.
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Introduction: An optimal orthodontic bonding system must minimize damage to the enamel during conditioning, have enough bond strength to prevent bracket de-bonding during treatment, and allow bracket removal at treatment completion, such that minimal damage is inflicted to the tooth.1 Pumice followed by acid etching has been the standard for many years; however, Groman Inc. (Margate, FL, USA) has stated that using their air-abrasion product will result in a tripling of bond strength. This method claims a three-fold increase in bond strength compared to traditional acid etching techniques by substituting air-abrasion using the EtchMaster® (Groman Inc., Margate, FL) 50 μm aluminum oxide in place of pumice prophy prior to acid etching. The purpose of this study is to see if this combination does in fact triple shear bond strength, and if so, what impact it has on the residual enamel surface after bracket removal, or de-bonding. Methods: Ninety recently extracted bovine incisors were randomly divided into three groups. Each of the three groups underwent different conditioning methods prior to bracket bonding. Group A: pumice + acid etch (N=30), Group B: air-abrasion + acid etch (N=30), and Group C: air-abrasion only (N=30). Enamel surface conditions were characterized using a Quanta 200 Scanning Electron Microscope (SEM) (FEI, Hillsboro, OR) and a SZX7 Stereomicroscope System (Olympus, Center Valley, PA). American Orthodontics Master Series System twin MBT mandibular incisor brackets (Sheboygan, WI, USA) were then bonded to each tooth. Following bonding, teeth were stored for twenty-four hours in water at 37°C +/- 2°C. All groups then underwent thermocycling of five hundred cycles in water baths set at five and fifty-five degrees Celsius. Next, the samples were mounted in dental stone and brackets de-bonded using a universal testing machine (Instron, Canton, MA) to obtain shear bond strength (SBS) values. SEM and optical stereomicroscopy were again utilized to evaluate the enamel surface and determine the adhesive remnant index (ARI) was score of each specimen. Results: The mean of Group A (pumice + acid etch) was 21.52 MPa with a standard deviation of 4.97 MPa. The mean of Group B (air-abrasion + acid etch) was 21.83 MPa with a standard deviation of 7.55 Mpa. The mean of Group C (air-abrasion only) was 8.12 MPa with a standard deviation of 3.05 MPa. Analysis of variance showed a main effect of Group on MPa, F(2, 87) = 60.66, p < 0.001, ηp2= 0.58. Post-hoc analyses using Tukey’s HSD indicated that SBS values were higher for teeth in Group A than for those in Group C (p < 0.001), teeth in Group B had higher SBS values than those in Group C (p < 0.001), but no difference was found for SBS between teeth in Group A and Group B (p =0.981). Results from the Fisher’s Exact test, where we controlled the Type I error using a Bonferroni correction, reveals that ARI scores differed by group (p < 0.001). Stereomicroscope images at 38.75x magnification obtained following enamel conditioning show Groups A (P+AE) and B (AA+AE) are almost indistinguishable; however, Group C (AA) has visual differences. Group C had a speckled reflective property that appeared to be residual aluminum oxide particles. Following de-bond, stereomicroscopic and SEM images showed no enamel defects on the tooth. Conclusions: SBS was not significantly different between Group A (pumice + acid etch) and Group B (air-abrasion + acid etch). SBS was significantly different between Groups A and B, and Group C (air-abrasion only). This means there is not a three-fold increase in SBS when using air-abrasion and acid etch, when compared to pumice and acid etch, as claimed by the manufacturer of the air-abrasion unit used in this study. Additionally, the air-abrasion only group displayed a significantly lower SBS than Group A and B. Air-abrasion only is not a suitable enamel preparation method for orthodontic bonding. Images obtained from the stereomicroscope and SEM reveal no observational damage to the enamel surface topography after de-bonding for any group.
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Scannavino, Fábio Luiz Ferreira. "Análise quantitativa das partículas de óxido de alumínio geradas na abrasão a ar em consultório odontológico /." Araraquara : [s.n.], 2005. http://hdl.handle.net/11449/95503.
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Orientador: Lourdes Aparecida Martins dos Santos-PintoBanca: Celso Luiz de Angelis Porto
Banca: Maria Cristina Borsatto
Resumo: O sistema de abrasão a ar funciona por meio de energia cinética produzida por um jato pressurizado de partículas de óxido de alumínio, que tem a finalidade de abrasionar a superfície dentária. O objetivo deste estudo foi avaliar a efetividade do sistema de sucção, disponível em consultório odontológico, na captação das partículas de óxido de alumínio emitidas pelo aparelho de abrasão a ar. Um dispositivo metálico, que reproduzia as posições e as distâncias de trabalho do cirurgião-dentista, foi elaborado para a deposição das partículas de óxido de alumínio presentes no campo operatório durante a utilização do sistema de abrasão a ar. Para a aspiração do pó de óxido de alumínio foram empregadas as sucções de alta potência e odontológica convencional com sugadores convencional e modificado por funil. A quantificação das partículas foi obtida pela massa de óxido de alumínio depositada após a aplicação do aparelho de abrasão a ar. Os resultados obtidos pela estatística descritiva gráfica revelaram que a maior deposição das partículas ocorreu a 20 cm do centro da cavidade bucal e na posição de trabalho 9 horas, quando se utilizou o sugador convencional em alta potência de sucção.
Abstract: The air abrasion system works using kinetic energy produced by pressurized air with aluminum oxide particles resulting in abrasion of the dental surface. The aim of this study was to compare the efficacy of high-volume evacuation (HVE) and conventional dental suction (CDS) in aluminum oxide particles evacuation. A metallic device was elaborated to reproduce the dentist operatory positions and to aluminum oxide particles deposition. The dust collection was made by conventional saliva ejector and modified ejector by funnel-shaped. The amount of particles showed that the greatest abrasive particles deposition occurred at the 20cm of distance from the center of the mouth at 9 o'clock operatory position with the conventional saliva ejector attached to high-volume evacuation (HVE).
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Scannavino, Fábio Luiz Ferreira [UNESP]. "Análise quantitativa das partículas de óxido de alumínio geradas na abrasão a ar em consultório odontológico." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/95503.
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O sistema de abrasão a ar funciona por meio de energia cinética produzida por um jato pressurizado de partículas de óxido de alumínio, que tem a finalidade de abrasionar a superfície dentária. O objetivo deste estudo foi avaliar a efetividade do sistema de sucção, disponível em consultório odontológico, na captação das partículas de óxido de alumínio emitidas pelo aparelho de abrasão a ar. Um dispositivo metálico, que reproduzia as posições e as distâncias de trabalho do cirurgião-dentista, foi elaborado para a deposição das partículas de óxido de alumínio presentes no campo operatório durante a utilização do sistema de abrasão a ar. Para a aspiração do pó de óxido de alumínio foram empregadas as sucções de alta potência e odontológica convencional com sugadores convencional e modificado por funil. A quantificação das partículas foi obtida pela massa de óxido de alumínio depositada após a aplicação do aparelho de abrasão a ar. Os resultados obtidos pela estatística descritiva gráfica revelaram que a maior deposição das partículas ocorreu a 20 cm do centro da cavidade bucal e na posição de trabalho 9 horas, quando se utilizou o sugador convencional em alta potência de sucção.
The air abrasion system works using kinetic energy produced by pressurized air with aluminum oxide particles resulting in abrasion of the dental surface. The aim of this study was to compare the efficacy of high-volume evacuation (HVE) and conventional dental suction (CDS) in aluminum oxide particles evacuation. A metallic device was elaborated to reproduce the dentist operatory positions and to aluminum oxide particles deposition. The dust collection was made by conventional saliva ejector and modified ejector by funnel-shaped. The amount of particles showed that the greatest abrasive particles deposition occurred at the 20cm of distance from the center of the mouth at 9 o'clock operatory position with the conventional saliva ejector attached to high-volume evacuation (HVE).
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Guarda, Guilherme Bottene 1987. "Efeito do tratamento da superfície, ciclagem térmica e fadiga mecânica na resitência de união entre uma cerâmica reforçada por dissilicato de lítio e em cimento resinoso." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289605.
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Orientadores: Lourenço Correr Sobrinho, Mário Alexandre Coelho SinhoretiDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo neste estudo foi investigar o efeito de diferentes tratamentos de superfície, fadiga mecânica e termociclagem na resistência da união à microtração da cerâmica IPS e.max (Ivoclar) e do cimento resinoso de ativação dupla. Métodos: 18 blocos de cerâmica (10 mm de comprimento x 7 mm de largura x 3 mm de espessura) foram confeccionados e divididos em 6 grupos (n=3): Grupos 1, 2 e 3 - jateamento por 5 segundos com partículas de óxido de alumínio de 50?m; Grupos 4, 5 e 6 - condicionamento com acido hidrofluorídrico à 10% por 20 segundos. O silano Rely X Ceramic Primer foi aplicado sobre todos os espécimes e seco por 5 minutos. Após, os blocos de cerâmica foram unidos à blocos de compósito restaurador Tetric N-Ceram (Ivoclar-Vivadent) com cimento resinoso RelyX ARC (3M ESPE), sob carga estática de 500 gf por 2 minutos. O excesso de cimento foi removido com micropincel e fotoativado por 160 segundos (40 s cada face) com um aparelho de LED (UltraLume 5, Ultradent). Os espécimes dos grupos 1 e 4 foram armazenados em água destilada a 37°C por 24 h. Nos grupos 2 e 5, os espécimes foram submetidos a 3.000 ciclos térmicos entre 5°C e 55°C. Para os grupos 3 e 6, os espécimes foram submetidos ao ensaio de fadiga mecânica por 100.000 ciclos com 2 Hz. Os espécimes foram seccionados perpendiculares a área de união para obtenção de palitos com área seccional de 1mm2 (25 palitos por grupo) e submetidos ao ensaio de resistência de união à microtração em máquina de teste universal (EZ Test - Shimadzu) com velocidade de 0,5 mm/min. Foi utilizado para verificar o padrão de fratura uma lupa estereoscópica (Olympus) com aumento de 40x. Os dados foram submetidos à Análise de Variância de 2 fatores e ao teste de Tukey (p<0,05). Os valores de resistência de união à microtração (MPa) foram: 26,9 ± 6,9, 22,2 ± 7,8 e 21,2 ± 9,1 para os Grupos 1 a 3 e 35,0 ± 9,6, 24,3 ± 8,9 e 23,9 ± 6,3 para os Grupos 4 a 6. O grupo controle submetido ao teste de fadiga e termociclado mostrou predominância de padrão de fratura adesiva para o tratamento de superfície com acido hidrofluorídrico a 10% e padrões adesiva e mista para tratamento de superfície com 50um de oxido de alumínio. Concluindo a fadiga e a termociclagem diminuíram significantemente a resistência de união à microtração para ambos os tratamentos de superfície das cerâmicas comparada ao grupo controle. Condicionamento com acido hidrofluorídrico a 10% aumentou a resistência de união à microtração para o grupo controle
Abstract: The aim of this study was to investigate the effect of surface treatments, mechanic fatigue and thermocycling tested on the microtensile bond strength of the ceramic IPS e.max Press (Ivoclar Vivadent) luted with dual-cured resin cement. Eighteen ceramic bars (10mm length x 7mm width x 3.0mm thickness) were fabricated, and divided into 6 groups (n=3): Groups 1, 2 and 3 - air particle abraded for 5 s with 50?m aluminum oxide particles; Groups 4, 5 and 6 - acid etched with 10% hydrofluoric acid for 20 s. Coupling agent silane was applied on to all bond surface specimens and allowed to dry for 5 s and the ceramic bars were bonded to a block of composite resin Tetric N-Ceram (Ivoclar-Vivadent) with Rely X ARC (3M ESPE) resin cement and placed under a 500 g static load for 2 min. The cement excess was removed with a disposable microbrush and 40 s light-activation (four activations) were performed using a LED curing unit (UltraLume LED 5, Ultradent). The specimens of the groups 1 and 4 were stored in distilled water at 37°C for 24 hours, groups 2 and 5 were submitted to 3,000 thermocycles between 5°C and 55°C and groups 3 and 6 submitted to a fatigue test for 100,000 cycles with 2 HZ. Specimens were sectioned perpendicular to the bonding area to obtain 1mm2 sectional area beams (25 beams per group) and submitted to a microtensile bond strength test in a universal testing machine (EZ Test - Shimadzu), at a crosshead speed of 0.5mm/min. The fracture specimens were observed under optical microscopy (Olympus) at a 40x magnification. Data were submitted to ANOVA and Tukey's test (p?0.05). Results: The microtensile bond strength values (MPa) were: 26.9 ± 6.9, 22.2 ± 7.8 and 21.2 ± 9.1 for G1-G3 and 35.0 ± 9.6, 24.3 ± 8.9 and 23.9 ± 6.3 for G4-G6. The control group, fatigue tested and thermocycled groups showed a predominance of failure adhesive for surface treatment with 10% hydrofluoric acid and adhesive and mixed for surface treatment with 50 ?m Al2O3. In conclusion the fatigue and thermocycling decreased significantly the microtensile bond strength for both ceramic surface treatments compared to control groups. Etching with 10% hydrofluoric acid increased the microtensile bond strength for the control group
Mestrado
Materiais Dentarios
Mestre em Materiais Dentários
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Silva, Vlamir Oliveira da [UNESP]. "Influência da técnica de preparo cavitário na microinfiltração marginal em restaurações de dentes decíduos." Universidade Estadual Paulista (UNESP), 2000. http://hdl.handle.net/11449/104285.
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silva_vo_dr_arafo.pdf: 540803 bytes, checksum: 7326794dd51a361dd48b2e7c4b355170 (MD5)O objetivo desse trabalho foi avaliar a influência da forma do preparo cavitário na microinfiltração marginal em restaurações em dentes decíduos. Foram preparadas canaletas medindo 2,0 mm nas faces vestibular e lingual de molares decíduos que foram divididas aleatoriamente em 3 grupos de acordo com a técnica de preparo cavitário: Grupo I - alta rotação associado à ponta diamantada; Grupo II - sistema de abrasão a ar; e Grupo III - laser Er:YAG. Após o condicionamento com ácido fosfórico por 15 segundos, foi utilizado o adesivo Single Bond (3M) e a resina Filtek Flow (3M) para restaurar as canaletas. Os espécimes foram então mantidos em estufa a 37ºC por 6 dias, termociclados (500 ciclos com temperatura variando entre 5 e 55ºC), isolados e colocados em solução de fucsina básica à 0,5% durante 24 horas. Após serem seccionados a microinfiltração foi avaliada em microscópio ótico ligado a uma câmera de vídeo com 10 X de aumento. Para se avaliar a forma das cavidades medimos os ângulos oclusal, cervical e de abertura das cavidades, bem como a largura e a profundidade das mesmas por meio de fotomicrografias obtidas em MEV. Os resultados demonstraram semelhança estatística entre as larguras dos preparos cavitários, porém os ângulos oclusal, cervical e de abertura das cavidades apresentaram-se diferentes estatisticamente e que não houve microinfiltração marginal em nenhum dos grupos avaliados e que a diferença na forma de preparo das cavidades não influenciou na microinfiltração marginal dos espécimes estudados.
The aim of this research was the evaluation of the cavity prepare technique on the marginal microleakage in deciduous teeth. Cavities measuring 2.0 mm were prepared on the buccal and lingual faces and were divided into three groups according to the cavity prepare technique: Group I - High speed associated to diamond bur; Group II - air abrasion system; and Group III - Er:YAG laser. After the phosphoric acid etching for 15 seconds, the Single Bond (3M) adhesive and te Filtek Flow (3M) were used for the restoration of the cavities. Then the sample was stored at 37ºC for 6 days, termocycled (500 cycles with temperature varying from 5 to 55º C), isolated and immersed in a 0.5% funcsin solution for 24 hours. After being sectioned the microleakage was examined with a magnification optical microscope connected to a color video camera. In order to evaluate the shape of the cavities the occlusal, cervical and cavity opening angles were measured, as well as the width and depth of then, using SEM photographs. The results showed that there was no marginal microleakage in any of the evaluated groups and that the difference in the cavity shape did not influence the marginal infiltration on the studied samples.
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Gabarrone, Lilian Rocha. "Avaliação da superfície do esmalte após diferentes tempos de jateamento de óxido de alumínio indicados para a colagem de braquetes." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/23/23151/tde-30092016-153400/.
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Objetivo: avaliar e comparar os efeitos do jato de óxido de alumínio sobre a superfície do esmalte, quando aplicados por tempos diferentes. Material e métodos: 110 pré-molares foram obtidos por meio de doações do Banco de Dentes da FOUSP. Os dentes foram divididos aleatoriamente em 5 grupos (n=22) para a aplicação de jato de óxido de alumínio por diferentes períodos de tempo. Nos grupos A, B, C, D e E o jato de óxido de alumínio de 50 ?m foi aplicado, respectivamente, por 01, 03, 05, 07 e 10 segundos. Avaliações quantitativas da superfície do esmalte foram realizadas pelas análises das alterações do perfil e da rugosidade (Sa) da superfície vestibular antes e após o seu jateamento, por meio do medidor de perfil Form Talysurf Intra (Taylor Hobson - AMETEK Inc, Pennsylvania) e do interferômetro a laser Talysurf CCl Lite (Taylor Hobson - AMETEK Inc, Pennsylvania), respectivamente. Uma avaliação qualitativa da superfície do esmalte foi realizada por meio da microscopia eletrônica de varredura (MEV). Para esta última análise, um exemplar de cada grupo foi selecionado aleatoriamente para que as superfícies de esmalte jateadas fossem devidamente preparadas para as suas leituras. Os dados quantitativos foram comparados pelo teste ANOVA, seguido do teste post hoc de Tukey, adotando-se um nível de significância de 5% (p= 0,05). Resultados: observou-se maior alteração do perfil e da rugosidade conforme se aumentou o tempo de aplicação do jato de óxido de alumínio. Porém, com relação à alteração do perfil, diferenças estatisticamente significantes foram observadas somente entre o grupo A (1s) quando comparado aos grupos D (7s) e E (10s), e entre o grupo B (3s) quando comparado com o grupo E (10s). Quanto à rugosidade, verificou-se diferença estatisticamente significante apenas entre o grupo E (10s) quando comparado aos demais grupos. As cinco imagens obtidas pelo microscópio eletrônico de varredura (MEV) demonstraram bastante semelhança entre si, com padrão de condicionamento marcado por picos e vales, porém as imagens dos esmaltes jateados por 1 e 3 segundos apresentaram esses picos e vales em menor quantidade. Conclusão: a perda de estrutura dentária e a rugosidade da superfície do esmalte aumentaram conforme se aumentou o tempo de aplicação do jato de óxido de alumínio; a aplicação do jato de óxido de alumínio por 1 e 3 segundos promove menos perda de estrutura de esmalte do que quando se jateia o esmalte por 10 segundos; maior rugosidade pode ser obtida com o jateamento de óxido de alumínio por 10 segundos; entretanto, o aspecto morfológico do esmalte dentário é bastante similar, independentemente do tempo de jateamento.Objective: To evaluate and compare the effects of aluminium oxide sandblasting on enamel surface when applied at different times. Materials & Methods: 110 premolars were obtained from the local tooth bank. The teeth were randomly divided into 5 groups (n = 22) for application of aluminium oxide sandblasting at different times. In Groups A, B, C, D and E, sandblasting with 50-?m aluminium oxide particles was applied for 01, 03, 05, 07 and 10 seconds, respectively. Quantitative assessments of enamel surface were performed by analysing changes in the profile and roughness (Sa) of the buccal surface before and after sandblasting application by using a profile gauge (Form Talysurf Intra, Taylor Hobson - AMETEK Inc, Pennsylvania, USA) and a laser interferometer (Talysurf CCl Lite, Taylor Hobson - AMETEK Inc, Pennsylvania, USA), respectively. A qualitative assessment of enamel surface was performed by means of scanning electron microscopy (SEM). For this latter analysis, a sample of each group was randomly chosen so that the sandblasted enamel surfaces could be adequately prepared to be evaluated. The quantitative data were compared by using ANOVA test, followed by post-hoc Tukey\'s test, at a significance level of 5% (P = 0.05). Results: Profile and roughness were found to be more altered as the sandblasting application time increased. With regard to the profile, however, statistically significant differences were found only in Group A (1s) compared to Groups D (7s) and E (10s), as well as in Group B (3s) compared to Group E (10s). With regard to the roughness, statistically significant difference was also observed only in Group E (10s) compared to the other groups. Five SEM images were demonstrated to be very similar to each other, with the conditioning pattern being marked by peaks and valleys, although SEM images of enamel blasted for 1 and 3 seconds showed peaks and valleys in lesser amount. Conclusion: Both loss of dental structure and enamel roughness increased as the time for application of aluminum oxide sandblasting also increased; application of aluminum oxide sandblasting for 1 and 3 seconds produced less loss of enamel structure compared to the 10-second application; more roughness can be obtained with application of aluminum oxide sandblasting for 10 seconds; however, the morphological aspect of the tooth enamel is very similar, regardless of the application time.
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Rajitrangson, Phitakphong. "Effect of surface conditioning methods on repair bond strength of microhybrid resin matrix composite." Connect to resource online, 2010. http://hdl.handle.net/1805/2138.
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Thesis (M.S.D.)--Indiana University School of Dentistry, 2010Title from PDF t. p. (viewed May 12, 2010) Advisor(s): Michael A. Cochran, Chair of the Research Committee, Jeffrey A. Platt, Bruce A. Matis, Carlos Gonzalez-Cabezas, Sopanis D. Cho. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 64-69).
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Taha, Ayam Ali Hassoon. "Development of a novel bioactive glass propelled via air-abrasion to remove orthodontic bonding materials and promote remineralisation of white spot lesions." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/43997.
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Enamel damage and demineralisation are common complications associated with fixed orthodontic appliances. In particular, the clean-up of adhesive remnants after debonding is a recognised cause of enamel damage. Furthermore, fixed attachments offer retentive areas for accumulation of cariogenic bacteria leading to enamel demineralisation and formation of white spot lesions (WSLs). Bioactive glasses may be used to remove adhesives, preserving the integrity of the enamel surface, while also having the potential to induce enamel remineralisation, although their efficacy in both respects has received little attention. A systematic review evaluating the remineralisation potential of bioactive glasses was first undertaken. No prospective clinical studies were identified; however, a range of in vitro studies with heterogeneous designs were identified, largely providing encouraging results. A series of glasses was prepared with molar compositions similar to 45S5 (SylcTM; proprietary bioactive glass) but with constant fluoride, reduced silica and increased sodium and phosphate contents. These glasses were characterised in several tests and the most promising selected. This was designed with hardness lower than that of enamel and higher than orthodontic adhesives. Its effectiveness in terms of removal of composite- and glass ionomer- based orthodontic adhesives was evaluated against SylcTM and a tungsten carbide (TC) bur. This novel glass was subsequently used for remineralisation of artificially-induced orthodontic WSLs on extracted human teeth. The novel glass propelled via the air-abrasion system selectively removed adhesives without inducing tangible physical enamel damage compared to SylcTM and the conventional TC bur. It also remineralised WSLs with surface roughness and intensity of light backscattering similar to sound enamel. In addition, mineral deposits were detected on remineralised enamel surfaces; these acted as a protective layer on the enamel surface and improved its hardness. This layer was rich in calcium, phosphate, and fluoride; 19F MAS-NMR, confirmed the formation of fluorapatite. This is particularly beneficial since fluorapatite is more chemically stable than hydroxyapatite and has more resistance to acid attack. Hence, a promising bioactive glass has been developed.
Books on the topic "Air abrasion"
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Natoli, Steve. Air abrasion in dentistry. Chicago, IL: American Dental Assistants Association, 1998.
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Dagdigian, Chris. Abrasive blasting, high pressure washing and lead-based paint in San Francisco. [San Francisco: The Bureau], 1994.
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Dagdigian, Chris. Abrasive blasting, high pressure washing and lead-based paint in San Francisco. [San Francisco: The Bureau], 1994.
Find full textBook chapters on the topic "Air abrasion"
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Guo, Zhong Ning, J. W. Liu, and F. Z. Zeng. "A Study of Surface Integrity in WEDM-HS with Air Medium." In Advances in Abrasive Technology VIII, 555–60. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-974-1.555.
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Wang, Lie Ding, Jun Sheng Liang, C. Liu, and Gong Quan Sun. "Development of a Silicon Based Air-Breathing Micro Direct Methanol Fuel Cell." In Advances in Abrasive Technology IX, 607–12. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-416-2.607.
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Fan, Jing Ming, Cheng Yong Wang, Jun Wang, and Guo Sheng Luo. "Effect of Nozzle Type and Abrasive on Machinablity in Micro Abrasive Air Jet Machining of Glass." In Advances in Grinding and Abrasive Technology XIV, 404–8. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-459-6.404.
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Gao, Hang, Y. G. Zheng, W. G. Liu, and Jian Hui Li. "Development of Vitrified Bond CBN Wheel for Internal Precision Grinding of the Air-Conditioner Compressor Piston Hole." In Advances in Grinding and Abrasive Technology XIII, 29–32. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-986-5.29.
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Huang, Chuan Zhen, Rong Guo Hou, Zeng Wen Liu, Quan Lai Li, and Hong Tao Zhu. "Two Domensional Simulation of Velocity Field of Two-Phase Flow for Gas and Solid in the Abrasive Air Jet Nozzle." In Advances in Grinding and Abrasive Technology XIV, 465–69. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-459-6.465.
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Wu, Yan, A. G. Sun, Bo Zhao, and Xun Sheng Zhu. "Modeling of High Efficiency Removal in the Grinding of Aluminal/ZrO2 Nanocomposites with the Aid of Two-Dimensional Ultrasonic Vibration." In Advances in Abrasive Technology IX, 451–58. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-416-2.451.
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Xiang, Dao Hui, Y. P. Ma, Bo Zhao, and Ming Chen. "Study on Critical Ductile Grinding Depth of Nano ZrO2 Ceramics by the Aid of Ultrasonic Vibration." In Advances in Grinding and Abrasive Technology XIII, 232–35. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-986-5.232.
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Cook, Richard J., Alex Azzopardi, Ian D. Thompson, and Timothy F. Watson. "A Method for Real-Time Confocal Imaging of Substrate Surfaces During Active Air Abrasion Cutting: The Cutting Edge of Air Abrasion." In Multi-Modality Microscopy, 197–218. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812774620_0009.
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Chapman, Stephen J., Grace V. Robinson, Rahul Shrimanker, Chris D. Turnbull, and John M. Wrightson. "Pleurodesis." In Oxford Handbook of Respiratory Medicine, edited by Stephen J. Chapman, Grace V. Robinson, Rahul Shrimanker, Chris D. Turnbull, and John M. Wrightson, 875–80. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198837114.003.0068.
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The aim of pleurodesis is to seal visceral to parietal pleura with adhesions to prevent pleural fluid or air accumulating. Pleurodesis is dependent upon lung re-expansion following removal of pleural fluid or air, which allows the apposition of visceral and parietal pleura. This may be encouraged by applying suction to an intercostal drain. Inflammation of the pleural surfaces and local activation of coagulation, required to produce pleural fibrosis and adhesions. May be induced by chemical sclerosing agent or by mechanical pleural abrasion at VATS.
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Leon, Albertine, Luiza Ungureanu, and Cristina Puscasu. "Air Abrasion: Interdisciplinary Modern Technologies— Approach to Minimally Invasive Treatment of Dental Caries." In Proceedings of the International Conference on Interdisciplinary Studies (ICIS 2016) - Interdisciplinarity and Creativity in the Knowledge Society. InTech, 2016. http://dx.doi.org/10.5772/65419.
Full textConference papers on the topic "Air abrasion"
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Schneider, O., F. K. Benra, H. J. Dohmen, and K. Jarzombek. "A Contribution to the Abrasive Effect of Particles in a Gas Turbine Pre-Swirl Cooling Air System." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68188.
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With the increase of cooling air passing through the internal air system of modern gas turbines, a greater number of airborne particles is transported to the film cooling holes in the turbine blade surface. In spite of their small size, these holes are critical for airflow and must be free of blockage. A test rig has been designed to study the quantity of separated particles at various critical areas of the internal air system. Former publications for this conference gave detailed insight into the test rig, the flow structure and the particle motion during separation. The process of separation generates abrasion on the rotating and stationary parts of the system. When considering service and maintenance or even unexpected operation faults of the gas turbine, it is important to know the location and abrasion rate of these critical areas. The flow structure within the pre-swirl cooling air system results in locally focused abrasion regions, which are investigated in this paper. New simulations, taking additional physical effects into account, are discussed in the paper. The simulation results are compared to results obtained by measurements and observations within the test rig. Qualitative and quantitative results show the ability to predict the quantity of abrasion during operation on various critical areas of the system.
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White, Joel M. "Ablation rate, caries removal, and restoration using Nd:YAG and Er:YAG lasers and air abrasion." In BiOS '98 International Biomedical Optics Symposium, edited by John D. B. Featherstone, Peter Rechmann, and Daniel Fried. SPIE, 1998. http://dx.doi.org/10.1117/12.306013.
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Varacalle, D. J., E. Acosta, J. Figert, M. Syma, J. Worthington, and D. Carrillo. "Experimental/Analytical Investigations of Air Plasma Spray Tungsten Carbide-Cobalt Coatings at Kelly Air Force Base." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0699.
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Abstract Air plasma sprayed tungsten carbide-cobalt coatings are being used at Kelly Air Force Base for a fretting application for convergent seals in aircraft engines. Experimental and analytical studies were conducted to investigate the plasma spraying of two powders for this application. Statistical processing schemes were accomplished in conjunction with analytical modeling of the air plasma spray (APS) process. Classical and statistically designed experiments (SDE) chosen to be conducted were determined by analytical modeling. The coatings were characterized for composition, hardness, porosity, surface roughness, deposition efficiency, and microstructure. Attributes of the coatings are correlated with the changes in operating parameters. Wear screening of the coatings from the experiments was conducted using an abrasion tester based on ASTM Standard Test B611-85.
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Khan, M. S. A., and T. W. Clyne. "Microstructure and Abrasion Resistance of Plasma Sprayed Cermet Coatings." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0113.
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Abstract Cermet (WC-Co) coatings have been produced on steel substrates by plasma spraying in vacuum and in air. These have been examined microstructurally and characterised in terms of porosity content, stiffness, microhardness and abrasion resistance. Particular attention has been paid to the phase constitution, as revealed by X-ray diffraction and scanning electron microscopy. High precision densitometry has been used to study porosity levels. Coatings with three different metal contents (9, 12 and 17wt.%Co) have been examined. There is a strong tendency for chemical reactions to occur within the plasma plume, particularly for spraying in air. These reactions can result in the formation of various carbides and even of metallic tungsten. Thermodynamic and kinetic aspects of the reactions involved are briefly examined. Such reactions are strongly promoted by the presence of oxygen, and are much less marked during vacuum plasma spraying. Plasma power and substrate temperature have secondary effects on the degree of reaction which occurs. A marked correlation was observed between degree of reaction and resistance to abrasive wear. This is consistent with the reaction products being brittle and causing poor interfacial cohesion. It was also found that wear resistance was greater for the coatings with lower metal contents. This behaviour can be attributed to the wear occurring predominantly by ploughing of the metallic phase and consequent release of ceramic particles. This occurred more readily when the metal content was higher. In coatings which had undergone pronounced chemical reaction, however, metal had been replaced by reaction products which conferred poor cohesive strength, leading to poor wear resistance.
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Giovannetti, Iacopo, Manuele Bigi, Massimo Giannozzi, Dieter R. Sporer, Filippo Cappuccini, and Marco Romanelli. "Clearance Reduction and Performance Gain Using Abradable Material in Gas Turbines." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50290.
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An improvement in the energy efficiency of industrial gas turbines can be accomplished by developing abradable seals to reduce the stator/rotor gap to decrease the tip leakage flow of gases in the hot gas components of the turbine. “ABRANEW” is a project funded by the European Commission aimed at developing a high temperature abradable material capable of controlled abrasion and resistant to erosion and oxidation. In order to define the basic parameters such as the component shape, the existing gap, the expected gap reduction, the seal thickness and other geometric parameters, a comprehensive review of the design of the blade/shroud/casing system was performed.
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Dadouche, A., M. J. Conlon, W. Dmochowski, B. Liko, and J. P. Bedard. "Experimental Evaluation of Abradable Seal Performance at High Temperature." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51228.
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Abradable seals have been used in aero-engines and land-based gas turbines for more than three decades. They are applied to various sections of the engine in order to reduce gas leakage by optimizing the gap between rotating and stationary parts. This optimization represents a significant increase in efficiency and decrease in fuel consumption. Performance evaluation of any abradable seal includes measurement of its mechanical properties, abradability tests and (ultimately) tests in engines. The aim of this paper is to study the effect of temperature on the rub performance of abradable seals. A series of experiments has been carried out in order to evaluate a commercially available seal material at different operating conditions. The effect of operating temperature on contact force, abrasion scar appearance and blade wear is examined and analyzed. A microstructural analysis of the rub scar has also been performed.
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Heinze, Kay, Konrad Vogeler, and Winfried-Hagen Friedl. "The Impact of Geometric Scatter on High-Cycle-Fatigue of Compressor Blades." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22083.
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The geometric parameters of manufactured compressor blades do not exactly comply with the design intention. These deviations result from the abrasion of the forging and milling machines as well as variations of the material properties or the blank part geometries. Using probabilistic methods, the geometric deviations can be considered within the design process. This paper presents the results of a probabilistic High-Cycle-Fatigue investigation under consideration of the geometric parameter scatter of the entire compressor blade. Based on a previous paper of the authors, the geometric parametrization as well as the process chain to apply the geometric scatter to an existing FE-mesh was supplemented by the radii and the geometric dimensions of the compressor blade root. Thus, the impact of all geometric parameter scatter on the High-Cycle-Fatigue strength, the eigenfrequencies and the mode shapes can be evaluated.
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Liu, Hou-lin, Man-hui Cao, Jie Chen, Yong Wang, and Cheng-bin Wang. "Experimental Study on Abrasion and Cavitation Resistance of Non-Metallic Coating Materials for Pump." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5003.
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Abstract The protection of the flow-passage components of pump by using coating is an important method to increase wear resistance. This paper aims at examining abrasion resistance and cavitation erosion resistance of three typical non-metallic coating materials for pump including epoxy resin mortar, composite resin mortar and polyurethane. A wear-resistance test bench was built, using ultrasonic vibrating air eroding machine. Meanwhile, the main relative raw materials and formulas were introduced. The results indicate that: (1) The accumulated volume reduction of abrasion of composite resin mortar changes in an oblique waveform, and its abrasion resistance is better than that of epoxy resin mortar in a short period of time. The wear rate of epoxy resin mortar and composite resin mortar is higher than that of polyurethane. The total wear volume of epoxy resin mortar, composite resin mortar and polyurethane is decreased by 8.74%, 9.89% and 0.58% respectively within 30h of anti-wear test time; (2) The accumulated volume reduction of cavitation erosion of epoxy resin mortar is proportional to the time. In anti-cavitation erosion test time of 26 h, the erosion volume of composite resin mortar, polyurethane and epoxy resin mortar cavitation is reduced by 0.44%, 0.29% and 0.35%, respectively. It shows that cavitation erosion resistance of three coating materials is similar, while polyurethane materials have the best abrasion resistance.
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Dallaire, S. "Hard Arc-Sprayed Coating with Enhanced Erosion and Abrasion Wear Resistance." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0575.
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Abstract Exposed to particle erosion environments, metal-sprayed coatings are damaged by micro-machining and ploughing at low impact angles. The generation and propagation of subsurface lateral cracks at high impacting angles damage single-phase ceramic coatings. Therefore, multicomponent coatings deposited by high-energy processes have been widely used to provide wear protection in most of the applications. As commercial arc-sprayed coatings have been used to a limited extent in applications involving erosion and abrasion wear, developing attractive wear resistant arc-sprayed coatings has been found necessary. A cored wire formulation, referred to as Alpha-1800, has been developed to produce tailored arc-sprayed coatings that are tough enough to resist particle impacts at 90° and sufficiently hard to deflect eroding particles at low impact angles. Typical 1 mm-thick coatings composed of ductile and hard phases with Knoop hardness reaching 1800 kg/mm2 were easily produced by arc spraying the cored wire with air. Coatings were: 1) erosion tested at 25°C and higher temperatures at impact angles of 25° and 90° in a gas-blast erosion rig, 2) slurry erosion tested at impact angles of 25° and 90°, 3) abrasion wear tested using the ASTM G-65 test procedure. Results show that coatings produced with the new cored wire are at least 5 times more erosion resistant and 10 times more abrasion resistant than coatings produced by arc spraying commercial cored wires. The performance of the new arc-sprayed coating can be compared with that of high-energy WC-based coatings. Being thermally stable up to 850°C, arc-sprayed coatings produced with the new cored wire are attractive for applications in many industrial sectors up to high temperatures.
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Ueno, Souichi, Akihiro Tsuji, Hiroyuki Adachi, and Tatsuya Naito. "Stress Improvement by Laser Peening in the Air." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66754.
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Underwater laser peening (LP) system has been developed for the purpose of preventing occurrence of Stress Corrosion Cracking. Toshiba has already applied LP for actual nuclear reactors, such as Control-Rot Drive housings in BWR and bottom mounted instrumentations in PWR and so on. At the same time, LP system in the air is expected since Reactor Vessel Head (RVH) is set on an operating floor during outage. In this study, LP system in the air was proposed which employs laser beam irradiation with concentric water jet. LP uses shock waves made by underwater confinement of plasma generated during laser abrasion which enables to induce compressive residual stress at 1mm in depth by optimizing laser energy, laser spot diameter and pulse density. A water jet has the functions of transmitting a laser beam without attenuating power and creating partial under water environment in the air. Hence potential core, which has no disturbance area in a water jet, should be increased in diameter and longer in distance from nozzle exit. LP tests in the air were performed by using the developed nozzles and measurements of residual stress were conducted. Test conditions are below; 70 mJ in laser energy, 1.0 mm in spot diameter, more than 30 mm in distance from nozzle exit to irradiation point, 36 shot/mm2 in pulse density, 90 degree in irradiation angle between laser axis and surface direction of irradiated area. Material of specimens was Alloy 600 nickel based alloy. Residual stress was measured by X-ray diffraction. It was confirmed that stress state at 1.0 mm in depth from the surface indicates compressive stress. These results concluded that LP in the air was conducted successfully.
Reports on the topic "Air abrasion"
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Health hazard evaluation report: HETA-2001-0279-3163, evaluation of air sampling methods for abrasive blasting - Louisiana. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, September 2012. http://dx.doi.org/10.26616/nioshheta200102793163.
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