Dissertations / Theses on the topic 'Cemento de ionómero de vidrio'
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Severino, Lazo Raisa Jordana Geraldine. "Sorción y solubilidad del cemento ionómero de vidrio y el cemento ionómero de vidrio modificado con resina." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4452.
Full text--- The aim of this study was to determine differences in sorption and solubility of a conventional glass ionomer cement and a resin-modified glass ionomer cement at 7, 15 and 30 days. Materials and Methods: 24 discs of each material were prepared and divided into 3 subgroups (7, 15 and 30 days) of 8 discs, randomly selected. The protocol established by the ISO 4049 for water sorption and solubility test was used. The discs were placed in an oven at 37 °C to constant mass (m1), then were immersed in 10 ml of distilled water. The discs were removed from the distilled water on the days indicated, and weighed (m2), then dried and re-weighed (m3). At the end of these process, their morphology was evaluated in a scanning electron microscope. Results and Conclusions: The sorption and solubility calculation was performed using mathematical expressions interrelated. The Krustal Wallis test, T-Student and U. de Mann-Whitney (p<0,05) showed statistically significant differences in both groups for both sorption and solubility. The resin-modified glass ionomer cement showed the highest sorption values (142,3195 ± 13,9402), while the conventional ionomer obtained the highest solubility values (36,4286 ± 14,5941) Keywords: Sorption, solubility, glass ionomer cement, resin-modified glass ionomer cement.
Tesis
Dávila, Ramírez Carolina Melky, and Calderón Bruno Barandiarán. "Comparación in vitro de la resistencia a la compresión de diferentes marcas de cemento ionómero de vidrio autocurable en la técnica de art." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/625025.
Full textTesis
Pantoja, Huaynate Sayumi Jazmin. "Evaluación in vitro de la microfiltración del silicato de calcio usado como base cavitaria en dientes permanentes." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2018. https://hdl.handle.net/20.500.12672/8653.
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Gil, Barreda Arlet Angelita, and Calero Olga Beatriz García. "Actividad antibacteriana de tres ionómeros de vidrio Ion Z®, Ketac Molar Easymix® y Fuji IX GP® sobre cultivos de Streptococcus mutans (ATCC 35668) y Lactobacillus acidophilus (ATCC 4366)." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2018. http://hdl.handle.net/10757/625106.
Full textObjective: To evaluate the antibacterial activity of three glass ionomers cements (Ion Z®, Ketac Molar Easymix® and Fuji IX GP®) on Streptococcus mutans (ATCC 35668) and Lactobacillus acidophilus (ATCC 4366). Materials and methods: The present study was experimental in vitro. It was made out using the direct contact method and optical density with a microplate, using six wells for each glass ionomer cement. Later, 150 ul of Streptococcus mutans and Lactobacillus acidophilus were independently added on BHI agar. The samples were incubated at 37 °C under conditions of controlled anaerobiosis. In the case of bacterial viability, the MTT assay was used. Results: It was found that the antibacterial effect of Ketac Molar Easymix® against the strain of Streptococcus mutans had 0.06 ± 0.01, while in Z® it was 0.16 ± 0.03 before the strain of Lactobacillus acidophilus, presenting statistically significant differences. Regarding the bacterial viability of Streptococcus mutans against Ketac Molar Easymix® obtained 0.92 ± 0.02, what corresponds to 29% of viable bacteria, whereas Lactobacillus acidophilus against Ion Z® had 0.31± 16, which represents 19% of viable bacteria. Conclusions: The three glass ionomers cements showed antibacterial activity. Ketac Molar Easymix® demonstrated greater antibacterial effect against Streptococcus mutans; on the other hand, it was evidenced that Ion Z® was more effective against Lactobacillus acidophilus.
Tesis
Basurto, Sampedrano Katherine Elizabeth, and Salazar Nathaly Carolina Barragán. "Comparación de la microfiltración del Ketac™ Molar e Ionofil Molar® con centrix y espátula TRA." Universidad Peruana de Ciencias Aplicadas (UPC), 2016. http://hdl.handle.net/10757/621122.
Full textZambrano, Capcha Shirley Liseth. "Influencia de dos revestimientos protectores sobre la propiedad de liberación de flúor del ionómero de vidrio convencional tipo II." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2017. https://hdl.handle.net/20.500.12672/6764.
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Quispe, Ampuero Johana Milagro. "Influencia del grabado ácido en la resistencia a la compresión del ionómero de vidrio base convencional e híbrido." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4318.
Full textThe aim of this study was to determine the influence of acid etching on the compressive strength of convencional glass ionomer base (Ketac Bond) and hybrid glass ionomer base (Vitrebond). 40 specimens were elaborated of 5 mm in diameter by 10 mm in height and they were prepared in a plastic mold; divided into two groups according to the type of glass ionomer base and also, subdivided into two groups according to the etching. The preparation of the ionomer was performed under the manufacturer. The acid etching was performed with phosphoric acid 37%, for 15 seconds, on the upper surface of the specimen, then he proceeded to washing with distilled water for 20 seconds and then the surface wiped with paper towel. Subsequently, measures of the specimens were calibrated with a vernier and parallelism of the surfaces was found, and then be stored for 24 hours in an oven at 37⁰ C until the time of the test, which took place in the universal testing machine (Mark J. AMSLER). The results of resistance average compression for each group was: conventional glass ionomer base with acid etching was 27.22 MPa, conventional glass ionomer base without acid etching was 31.51 MPa, hybrid glass ionomer base with acid etching was 72.46 MPa and hybrid glass ionomer without acid etching was 95.54 MPa. The results were analyzed by two-way ANOVA and comparisons between groups, the Student t test was used. It was concluded that etching and glass ionomer type influence on the compressive strength. Keywords: Compressive strength, conventional glass ionomer base, hybrid glass ionomer base, acid etching.
Tesis
Luna, Bastías Melisa Sofía. "Estudio comparativo in vitro del sellado marginal de dos tipos de vidrio ionómero modificados con resina." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/117465.
Full textSe realizó un estudio comparativo in vitro con el objetivo de evaluar la microfiltración marginal de dos cementos de vidrio ionómero modificados con resina. En el grupo (A) se realizaron restauraciones con el vidrio ionómero modificado con resina Fuji II LC® (GC America Inc., IL, USA) y en el otro grupo (B) se realizaron obturaciones con el vidrio ionómero modificado con resina Geristore® (Den-Mat Corporation, CA, USA). Para evaluar la microfiltración marginal se utilizaron 30 terceros molares sanos, recientemente extraídos a los cuales se les realizaron dos cavidades operatorias clase V estandarizadas, ubicadas en las caras vestibular (grupo A) y palatino/lingual (grupo B), con el margen gingival 1 mm sobre el límite amelocementario y el margen oclusal en esmalte. Posteriormente se obturaron las cavidades con los cementos de vidrio ionómero modificados con resina Fuji II LC® en las caras vestibulares y Geristore® en las caras palatino/ linguales de cada molar. Una vez realizadas las obturaciones se procedió a impermeabilizar las raíces de las piezas dentarias con cianocrilato, barniz y resina acrílica. Con el objetivo de visualizar el grado de microfiltración marginal de las restauraciones sometidas a prueba, los molares estudiados fueron expuestos a un proceso de termociclado entre 5° C-55° C en una solución acuosa de azul de metileno al 1% durante 100 ciclos. Cuarenta y ocho horas después de realizados los 100 ciclos las muestras fueron cortadas transversalmente pasando por la mitad de las restauraciones para así exponer la interfase diente restauración. Los cortes transversales se observaron en el microscopio óptico para medir el grado de microfiltración de azul de metileno en la interfase diente restauración. Los resultados obtenidos en porcentajes de los grupos de prueba, se sometieron al análisis estadístico con la prueba no paramétrica de U de Mann- Whitney, encontrándose que no hay diferencias significativas entre ambos.
Olivares, Núñez Sergio David. "Estudio in vitro de la resistencia a la tracción de cilindros colados cementados a análogos de pilar de implantes con tres tipos de ionomero de vidrio." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2015. https://hdl.handle.net/20.500.12672/4545.
Full text--- The purpose of this study was to compare in vitro the resistance to the traction of cylinder casts, cemented to the implant abutment analogue utilizing 3 different ionomer cementations (GC Fuji I, Ketac Cem™ Easy Mix and RelyX™ Luting 2). For this, we prepared 18 specimens made up of implant abutment analogues and cylinder cast, which were divided randomly into 3 groups (n=6) for each of the ionomers studied. The cylinder casts were cemented on each abutment analogue respectively utilizing the ionomer cement corresponding to its group. Then the specimens of each group were subject to the traction test utilizing a universal rehearsal machine (zwickiLine by Zwick/Roell), until the cement failed. The results that were obtained by the machine were registered in the computer for later analysis. Next we made the corresponding statistical tests, determining that there was no significant statistical difference between the 3 types of ionomers. Presenting from greater to lesser resistance to the traction; the glass ionomer cement modified with resin RelyX™ Luting 2, the glass ionomer of cementation GC Fuji I and the glass ionomer of cementation Ketac Cem™ Easy Mix respectively. Key words: ionomer – resistance to traction - abutment – cylinder cast - dental implant
Tesis
Sepúlveda, Rebaudo Gabriela. "Evaluación de la bioactividad del cemento Biodentine TM modificado con nanopartículas de vidrio bioactivo." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/137670.
Full textLa obtención de un adecuado sellado marginal diente/restauración, es una de las condiciones más relevantes para predecir éxito al reemplazar tejido dentario con un material dental (Masih y cols. 2011). Las brechas en la interfaz material-dentina son responsables de la sensibilidad post operatoria y caries secundarias que pueden llevar al fracaso de una restauración(Pashley y cols. 2002) (Mjor y Toffenetti 2000). Por años se ha estado en búsqueda de un material que enfrente el desafío de reemplazar denti na, logrando a su vez un buen sellado marginal, por lo que se han desarrollado diferentes tipos y estrategias, por ejemplo: los cementos de vidrio ionómero y su unión química con el tejido dentario , los sistema adhesivos de las resinas compuestas que forman una capa híbrida con tejidos dentarios (Camilleri 2013) (Raju y cols. 2014) (Auschill y cols. 2009). Sin embargo, ninguno de estos materiales permite obtener un sellado adecuado en situaciones donde no es posible controlar la humedad.
Saavedra, Brunod Sebastián Alejandro. "Estudio comparativo ex-vivo de la resistencia al cizallamiento de probetas de vidrio ionómero convencional en superficie dentaria grabada versus superficie dentaria no grabada." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/117276.
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El propósito de este trabajo fue evaluar y comparar la resistencia al cizallamiento entre un cemento de vidrio ionómero convencional y la superficie dentaria tratada con grabado ácido previo y sin grabado ácido previo. Para este estudio se utilizaron 24 terceros molares sanos y recientemente extraídos, donde cada uno fue dividido en dos mitades, obteniéndose 48 segmentos con esmalte y dentina, y cuya superficie interna fue alisada. Estas muestras fueron separadas en dos grupos experimentales, en uno de los grupos se adhirieron probetas cilíndricas de vidrio ionómero convencional (Riva self cure, SDI) sobre la superficie interna del diente, la cual fue previamente grabada con ácido fosfórico al 37% por 20 segundos en el esmalte y 10 segundos en dentina; en el otro grupo se adhirieron probetas idénticas de vidrio ionómero pero la superficie dentaria no fue tratada con grabado ácido. Luego, a cada muestra se le confeccionó un vástago y posteriormente fueron almacenadas en una estufa a 37° C y a 100% de humedad relativa durante 7 días. Los 48 cuerpos fueron testeados en una máquina de ensayos universales Tinius Olsen y los valores obtenidos fueron analizados estadísticamente. El análisis de los resultados, mediante el t test, indicó que existen diferencias estadísticamente significativas (p-valor < 0,05) entre los 2 grupos experimentales. El grupo en que se realizó un grabado ácido previo obtuvo mayores valores promedio (1,97 MPa) de resistencia al cizallamiento que el grupo donde no se efectuó un grabado ácido previo (1,29 MPa). Se concluyó que existen diferencias estadísticamente significativas en la resistencia al cizallamiento entre el vidrio ionómero convencional y la superficie dentaria grabada y superficie dentaria no grabada.
Díaz, Rojas María Jesús. "Análisis exvivo de la microfiltración de restauraciones de resina compuesta con base cavitaria de vidrio ionómero modificado con resina al establecer una variación en la secuencia de grabado ácido." Tesis, Universidad de Chile, 2014. http://repositorio.uchile.cl/handle/2250/131280.
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El propósito de este estudio fue evaluar y comparar el grado de microfiltración exvivo, de restauraciones de resina compuesta con base cavitaria de vidrio ionómero modificado con resina, al realizar la técnica de grabado ácido antes y después de la colocación de ésta. Para dicho estudio se utilizaron 25 terceros molares sanos y recientemente extraídos, donde a cada uno le fueron realizadas 2 restauraciones clase V, una de ellas con base de vidrio ionómero modificado con resina colocado antes del grabado ácido y la segunda con el vidrio ionómero insertado en la cavidad posterior al proceso de grabado ácido. Se obtuvieron así 50 muestras, que para ser analizadas debieron ser selladas (con vidrio ionómero, cianocrilato y acrílico naranjo), para luego ser sometidas a un proceso de termociclado, consistente en su inmersión durante 100 ciclos en solución acuosa de azul de metileno al 1% a 4º C, temperatura ambiente y 60ºC. Se procedió a cortar las piezas dentarias con discos carburundum y a realizar las mediciones correspondientes del grado de microfiltración de las restauraciones, de acuerdo al porcentaje de tinción de las muestras. Los datos obtenidos se sometieron a análisis estadístico, descriptivo y análisis inferencial, en donde se determinó que no existen diferencias estadísticamente significativas entre ambos grupos estudiados. Se concluye que la diferencia no es estadísticamente significativa entre los grupos estudiados ya que ambas técnicas presentan el mismo grado de microfiltración.
Enriquez, Vivanco Jaime Gabriel Jesús, and Giagun Kioshi Alberto Shimabukuro. "Diseño de mezcla de concreto f’cr 210 kg/cm2 mediante la adición de vidrio molido reciclado en reemplazo parcial de cemento tipo I en Lima-Perú." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2019. http://hdl.handle.net/10757/628155.
Full textThis project aims to inform the reader about a way in which wasted glass can be used in the construction sector providing benefits for civil engineering. This investigation is carried out using recycled ground glass as an addition to concrete and achieving a mix design with a required compressive strength of 210 kg / cm2 after 28 days of curing and a 3-4 inch slump. To find out the advantages of using recycled ground glass as an addition to concrete, it is necessary to make a comparison between a standard concrete and those added with glass powder. Three types of concrete were proposed with different doses of partial replacement of Type I cement with glass dust, these are 0%, 10% and 20%. Multiple mixing designs were made until reaching the final designs, which comply with a 3 to 4 inch slump and a f’cr of 210 kg / cm2 at 28 days. Then, a unit price analysis for the final designs is carried out and these are compared. Finally, the results show that concrete with 20% replacement has a lower production cost than the rest. Another important result is that, the more glass added to the concrete, the lower its resistance at an early age. In summary, by replacing 20% of the cement with glass dust, an economic benefit can be obtained.
Tesis
Tauquino, Álvarez Jaime Franco. "Evaluación in vitro de la microdureza superficial de una resina compuesta microhíbrida, una resina compuesta fluída y un cemento ionómero vitreo de restauración frente a la acción de una bebida carbonatada." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2002. https://hdl.handle.net/20.500.12672/1135.
Full textIn this study the “in vitro” effect of a carbonated beverage on the superficial microhardness of three restorative esthetic material for direct restorations, a microhybrid composite, a fluid composite and a restorations glass ionomer was analyzed. Eight 4mm diameter and 2mm high cylindrical blocks were elaborated of each material in study. Four of them were stored in an isotonic solution and taken as a control group. The four ones left were submitted to the effect of a carbonated beverage 10 minutes for 7 days at environmental temperature, and while the experiment wasn’t made they were stored in an isotonic solution at environmental temperature. An initial and final superficial microhardness measurement were made to analyze if there was any variation. To determinate if the variations found were significant, the T- STUDENT test were applied, and to compare variations between the three materials the ANOVA test were used. This study concluded that there were significant decrease on superficial microhardness of all tested materials submitted to the carbonated beverage effect. But despite of microhybrid composite shows a greater decrease than the other two materials the difference is not significant.
Tesis
Campos, Concha María Pilar. "Análisis in vitro de la efectividad de la transmisión de la luz a través de postes de fibra de vidrio en la polimerización de un cemento de resina compuesta." Tesis, Universidad de Chile, 2011. http://repositorio.uchile.cl/handle/2250/132049.
Full textAutor no autoriza el acceso a texto completo de su documento
Introducción: El objetivo de los postes de fibra de vidrio translúcidos es transmitir la luz a lo largo del conducto radicular, permitiendo una óptima polimerización del sistema adhesivo y de cemento de resina compuesta. El propósito de este estudio es determinar si los postes de fibra de vidrio translúcidos transmiten luz en intensidad suficiente para activar el cemento de resina compuesta a nivel apical. Materiales y métodos: Se realizó un estudio descriptivo. Se utilizó un segmento de raíz de 8 mm, teñido de negro y moldeado con silicona de impresión de consistencia masilla. Este molde se utilizó para posicionar tres postes de fibra de vidrio translúcidos: ParaPost Taper Lux, RelyX Fiber Post y Tenax Fiber White. Se realizaron fotografías de la luz que se proyectó en apical al iluminar mediante una lámpara de fotocurado la raíz sola y con cada poste. Se evaluó la profundidad de polimerización del cemento de resina compuesta RelyX ARC iluminando a través del conducto sin poste y con cada poste en distintos tiempos de polimerización, una muestra de 1mm de grosor de cemento de resina compuesta. Luego se realizó la técnica de raspado para obtener el valor ISO 4049 de las muestras. Los datos obtenidos fueron analizados de manera descriptiva. Resultados: En la comparación fotográfica se observaron diferencias entre la luz emitida entre los distintos postes. De acuerdo a los valores ISO 4049 obtenidos, a los 40, 60 y 90 segundos, el conducto sin el poste logró una polimerización de un 36%, 42% y 49% respectivamente. El poste ParaPost Taper Lux a los 60 y 90 segundos logró polimerizar en un 32% y un 46% respectivamente, Tenax Fiber White y RelyX Fiber Post no lograron polimerizar a nivel apical a ninguno de los tiempos sometidos. Conclusiones: 1.- Existen diferencias en la transmisión de la luz entre distintos postes de fibra de vidrio. 2.- Al aumentar el tiempo de fotopolimerización se logró mayor grosor de polimerización del cemento de resina compuesta, en el control sin el poste y el poste ParaPost Taper Lux.
Lalinde, Castrillón Luis Felipe. "Estudio de compuestos de GRC y adiciones activas: Propiedades mecánicas, envejecimiento acelerado y durabilidad." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/157637.
Full text[CAT] En l'àmbit dels materials compostos o compòsits per a la construcció, el ciment reforçat amb fibres de vidre (GRC, de l'anglès glass fiber reinforced cement) és el més extensament utilitzat, per les seves excel·lents propietats mecàniques (resistència a flexió i tenacitat). No obstant això, la durabilitat d'aquests compòsits s'ha demostrat crítica, i cal proposar alternatives. Les fibres usades, de caràcter àlcali-resistent (fibres AR, formades per agrupació de filaments), són atacades pel medi agressiu que imposa el ciment hidratat. Una alternativa interessant des del punt de vista tecnològic és la incorporació de materials cimentants suplementaris de caràcter putzolànic. L'objectiu d'aquest treball és estudiar la influència de les diferents addicions actives en morters de GRC, observant el comportament dels elements constitutius del material en condicions normals de curat, i també quan son sotmesos a processos d'envelliment controlat. Així mateix, s'analitza el comportament dels nous compòsits sotmesos a diferents mitjans agressius, avaluant la durabilitat i la millora dels compostos mitjançant la determinació de les seves propietats mecàniques, químiques i físiques. S'han elaborat provetes de GRC a través del procediment de mescla prèvia (premix) i s'ha determinat les seves propietats mecàniques (resistència a flexió, tenacitat, mòdul d'elasticitat). Addicionalment s'han quantificat els guanys de resistència al comparar compòsits GRC basats en ciment Portland (espècimens control) amb altres en què s'ha substituït fins al 60% d'aquest ciment per materials putzolànics. A l'objecte de millorar la reactivitat de les putzolanes, en alguns casos s'ha implementat un augment de la seva finor a través de la mòlta (cendres volants mòltes, CVm) o de processos de sonicació (fum de sílice sonicat, HSS). Els espècimens de GRC han estat sotmesos a un procés d'envelliment (tractament en aigua a 55ºC durant un període prolongat) i s'ha observat l'empitjorament molt significatiu de la resistència a flexió i la tenacitat d'aquells que posseeixen solament ciment Pòrtland com a component cimentant. Els compòsits GRC que contenen quantitats elevades de putzolana (60% de CVm) o mescles de putzolanes (50% CVm / 10% HSS, 50% CVm / 10% FCC) presenten una millora substancial de les propietats mecàniques respecte als GRC control. La millora d'aquests sistemes GRC amb elevats percentatges de putzolanes reactives s'han confirmat a través d'estudis físics i fisicoquímics: avaluació de densitat, absorció, estudis microscòpics (lupa i microscòpia electrònica de rastreig) i anàlisi termogravimètric. Pel que fa a la resposta dels compòsits GRC enfront de diferents dissolucions agressives, s'ha demostrat l'efecte beneficiós de la presència de putzolanes. Després de l'exposició dels morters de GRC a una dissolució de NH4Cl, el comportament mecànic dels morters putzolànics es millor que el morter GRC control: això es deu a la relació directa existent amb l'increment de la densitat i la disminució del grau d'absorció del compòsit amb la putzolana. Quan s¿ha avaluat les propietats dels morters de GRC després de la seva exposició a una dissolució H2SO4, s'observen diferències molt importants en l'evolució de la massa, resistència a flexió i tenacitat: els compòsits control són més afectats per l'acidesa del medi, de manera que la pèrdua de massa és molt significativa si es compara amb els GRC que presenten putzolanes. L'estada a l'empresa Saint Gobain Vetrotex, ha permès confirmar una gran similitud en els resultats obtinguts mitjançant els procediments seguits en el laboratori de la UPV (compostos de GRC amb premescla) comparats amb les pràctiques desenvolupades pel laboratori de materials de l'empresa (compostos de GRC projectat). S'han avaluat prototips per a la indústria de l'GRC projectat.
[EN] In the field of composite materials for construction, glass fiber reinforced cement (GRC) is the most widely used, due to its excellent mechanical properties (resistance to bending and toughness). However, the durability of these composites has been demonstrated to be critical and alternatives need to be proposed. The used fibers, alkali-resistant (AR fibers, formed by grouping of filaments), are attacked by the aggressive medium imposed by the hydrated cement. An interesting alternative, from a technological point of view, is the incorporation of supplementary cementitious materials of pozzolanic behaviour. The purpose of this research is to study the influence of the different mineral additions in GRC mortars, observing the behaviour of the constituent elements of the material under normal curing conditions and controlled aging processes. Likewise, the behaviour of new composites subjected to different aggressive environments is analyzed, evaluating the durability and improvement of the compounds by determining their mechanical, chemical and physical properties. GRC specimens have been produced through the premix procedure and their mechanical properties (flexural strength, toughness, and modulus of elasticity) have been determined. Additionally, resistance gains have been quantified when comparing GRC composites based on Portland cement (control specimens) with others in which up to 60% of that cement has been replaced by pozzolanic additions. In order to improve the reactivity of pozzolans, in some cases an increase in its fineness has been implemented through grinding (ground fly ash, CVm) or sonication processes (sonicated silica fume, HSS). The GRC specimens have been subjected to an aging process (treatment in water at 55ºC for an extended period) and worsening of the flexural strength and toughness of those who only have Portland cement as cementitious component has been observed. GRC composites containing high amounts of pozzolan (60% CVm) or mixtures of pozzolans (50% CVm / 10% HSS, 50% CVm / 10% FCC) show a substantial improvement in mechanical properties compared to the control GRC. The improvement of these GRC systems with high percentages of reactive pozzolans have been confirmed through physical and physical-chemical studies: evaluation of density, absorption, microscopic studies (magnifying glass and scanning electron microscopy), and thermogravimetric analysis. Regarding the response of GRC composites against different aggressive solutions, the beneficial effect of the presence of pozzolans has been demonstrated. After the exposure of the GRC mortars to a NH4Cl solution, the mechanical behavior of pozzolanic mortars remains above that of the control GRC mortar: this is due to the direct relationship existing with the increase in density and the decrease in the absorption of the composite with the pozzolanic replacement. When evaluating the properties of GRC mortars after exposure to an H2SO4 solution, very important differences are observed in the evolution of the mass, flexural strength and toughness: the control composites are more affected by the acidity of the medium, so that the loss of mass is very significant when compared to the GRCs that present pozzolans. The stay at the Saint Gobain Vetrotex company has confirmed a great similarity to the results obtained by the procedures followed at the UPV laboratory (premixed GRC compounds) compared to the practices developed by the company's materials laboratory (composites of projected GRC). Scalable prototypes have been assessed for the projected GRC industry.
Lalinde Castrillón, LF. (2020). Estudio de compuestos de GRC y adiciones activas: Propiedades mecánicas, envejecimiento acelerado y durabilidad [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/157637
TESIS
Castillo, Alva Guillermo Ricardo. "Fuerza de adhesión a la dentina radicular de dos cementos resinosos para postes de fibra de vidrio en conductos tratados con un cemento sellador de endodoncia a base de bálsamo del Perú." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2012. https://hdl.handle.net/20.500.12672/2815.
Full textTesis
Uribe, Echevarria Leonardo. "Interfaces de adhesión a dentina de cementos de ionómeros de vidrio convencionales, de alta viscosidad y modificados con resinas, composición química, acción del ácido fosfórico y técnica laminar." Doctoral thesis, 2017. http://hdl.handle.net/11086/4789.
Full textCosta, Nuno Miguel Garrido Santos. "Alterações microestruturais de materiais restauradores sujeitos a bebidas gaseificadas." Master's thesis, 2017. http://hdl.handle.net/10316/82763.
Full textO estudo tem como propósito analisar a variabilidade de características dentárias como a dureza, rugosidade e peso, em função da absorção de um material restaurador estético, quando sujeito a condições ambientais como a imersão em cerveja, em refrigerante gaseificado e água. Filtek Supreme XTE™ (3M ESPE, St. Paul, MN, EUA), resina composta nanoparticulada, e Ketac Universal Aplicap™, ionómero de vidro, são os materiais selecionados para a consecução do estudo. O método aplicado no estudo foi análise comparativa, utilizando dados qualitativos e quantitativos das características dos espécimes selecionados. Trinta espécimes paralelepípedos (6 mm x 13 mm x 4 mm) de cada composto foram preparados, polidos e armazenados numa estufa a 37° C durante 336 horas (14 dias). Os espécimes foram divididos em 6 grupos (n = 60). Grupos 1, 2: armazenados em água (Penacova®). Grupos 3, 4: em cerveja (Super Bock®). Grupos 5, 6: em refrigerante gaseificado (Coca Cola®). Foi realizada uma primeira avaliação após 7 dias (168 horas); e uma segunda avaliação após 14 dias (336 horas). Em cada avaliação foi registado a rugosidade superficial num rugosímetro, o peso numa balança de precisão e a dureza num durómetro. Os dados foram registados em tabelas e transcritos para gráficos específicos. Foram utilizados métodos One-Way-ANOVA, Tukey e Bonferroni com um nível de significância de 5% para a análise estatística.Para o Filtek Supreme XTETM houve uma diminuição considerável da microdureza em todos os grupos. Para o Ketac Universal Aplicap™ houve uma grande diminuição da microdureza. Relativamente à rugosidade, o parâmetro da média de rugosidade (Ra), da profundidade de rugosidade única (Rz), de rugosidade da média quadrática da raiz (Rq) e de skweness (Rsk) apresentaram-se constantes para todos os grupos de Filtek Supreme XTETM. No entanto, os parâmetros Ra e Rq registaram um aumento significativo nos grupos de Ketac Universal Aplicap™, sujeitos à cerveja e Coca-cola® (grupo 3, 5). O contrário foi registado para o Rsk, onde houve uma diminuição significativa dos valores. O Rz não foi considerado para o Ketac Universal Aplicap™ devido à sua inviabilidade. O Filtek Supreme XTE™ apresenta maior resistência à erosão por bebidas gaseificadas e consegue manter as suas propriedades microestruturais, quando comparado com o Ketac Universal Aplicap™.
The purpose of this study was to analyze the variability of dental characteristics such as hardness, roughness and weight, due to the absorption of an aesthetic restorative material, when subjected to environmental conditions such as immersion in beer, carbonated refrigerant and water. Filtek Supreme XTE ™ (3M ESPE, St. Paul, MN, USA), nanofilled composite resin, and Ketac Universal Aplicap ™, glass ionomer, are the materials selected for the study. The method applied in the study was comparative analysis, using qualitative and quantitative data of the characteristics of the selected specimens. Thirty parallelepiped specimens (6 mm x 13 mm x 4 mm) of each compound were prepared, polished and stored in an oven at 37 ° C for 336 hours (14 days). The specimens were divided into 6 groups (n = 60). Groups 1, 2: stored in water (Penacova®). Groups 3, 4: in beer (Super Bock®). Groups 5, 6: in carbonated refrigerant (Coca Cola®). A first evaluation was performed after 7 days (168 hours); And a second evaluation after 14 days (336 hours). In each evaluation the surface roughness was recorded in a rugosimeter, the weight in a precision scale and the hardness in a durometer. Data were recorded in tables and transcripts for specific graphs. One-Way-ANOVA, Tukey and Bonferroni methods were used with a significance level of 5% for statistical analysis. For Filtek Supreme XTE there was a considerable decrease in microhardness in all groups. For Ketac Universal Aplicap there was a large decrease in microhardness. In relation to the roughness, the parameter of the roughness average (Ra), the single roughness depth (Rz), root mean square roughness (Rq) and skweness (Rsk) were constant for all Filtek Supreme groups XTE. However, the Ra and Rq parameters registered a significant increase in the Ketac Universal Aplicap groups, subject to beer and Coca-Cola® (group 3, 5). The opposite was recorded for Rsk, where there was a significant decrease in values. Rz was not considered for Ketac Universal Aplicap due to its non-viability. Filtek Supreme XTE ™ is more resistant to erosion by carbonated beverages and can maintain its microstructural properties when compared to Ketac Universal Aplicap ™.
Salciarini, Rafael Nascimento. "Tratamento restaurador atraumático: uma intervenção resolutiva em crianças sem acesso ao tratamento dentário convencional." Master's thesis, 2019. http://hdl.handle.net/10284/8846.
Full textThe goal of this work was to gather scientific information about the use of dental atraumatic restorative treatment in children without access to conventional dental treatment. The used methodology consisted in a narrative bibliographic review, based on the analysis of publications available in the PubMed database, performing an exploratory, selective and interpretative reading of the selected material. The main topic was the dental atraumatic restorative treatment, used in oral health prevention and promotion of children living in areas with difficult access to dental care services. The atraumatic restorative treatment is a minimal intervention approach to treat decayed teeth, using hand instruments only and the high-viscosity glass ionomer cement as the adhesive restorative material to the tooth structures. It is a less traumatic approach than conventional dental treatment and is therefore more acceptable by children, providing them less pain and the interruption of dental caries progress.
Montero, Eduardo. "Protocolos para a colocação e remoção de espigões." Master's thesis, 2016. http://hdl.handle.net/10284/5577.
Full textThe use of Posts in endodontically treated teeth is one of the most studied topics in dentistry. Opinions are divergent with respect to clinical procedures and materials to be used for placement and removal of Posts. The aim of this study was a literature review order to arrange concepts and clinical principles to clarify the factors that determine the need for placement, use and choose to Post type, your cementation and techniques for removal. The characteristics and properties of zinc phosphate cement, glass ionomer, resin cements chemical curing, dual curing, photo-curing and etch and rinse, self etch and self adhesive bonding agents were analyzed. Also, techniques for removing Posts cemented with different cements and adhesive systems and then access the remaining “gutta-percha” for the endodontic retreatment. A literature search was made in the electronic database PubMed, Google Scholar e RCAAP with the following keywords: “Espigões”; “Retratamento Endodôntico”; “Ionómero de Vidro”; “Fosfato de Zinco”; “Cimentos Resinosos”; “Posts”; “Endodontic Retreatment”; “Glass Ionomer”; Zinc-phosphate”; “Resin Cements"; “Push Out Test”; “Posts AND Removal”. It was concluded that the cement fiber Posts with resin cements dual curing associated with the self etch adhesive systems are gradually replacing other types of Posts and other cements and allow restoring the tooth proper and lasting manner. And the use of ultrasound is more effective and safe Posts removal.
Ermida, Edgar Cavalheiro. "Avaliação do desempenho clínico de restaurações cervicais de lesões não-cariosas em dentes com e sem desgaste oclusal efetuadas por alunos do MIMD da UCP." Master's thesis, 2015. http://hdl.handle.net/10400.14/18804.
Full textIntroduction: Non-carious cervical lesions are defined by the loss of tooth structure related to non-carious processes. Despite its questionable aetiology in literature, it is believed to be caused by many factors that often arise combined and which can act in synergy. It is considered that abrasion, erosion and abfraction have key roles in the origin of these conditions. The main forms of treatments use glass ionomer cements and composite resins with adhesive systems. However, such restorative treatments, do not demonstrate long-term effectiveness due not only to the characteristics of these lesions, but also the properties of the materials themselves. Objectives: This study aims to assess the clinical performance of restorations in non-carious cervical lesions using composite resins and glass ionomer cements in terms of aesthetic, functional and biological performance and their association with the presence or absence of occlusal wear facets. Materials and Methods: A total of 32 vital teeth with non-carious cervical lesions, with and without occlusal wear facets were restored, using a nanohybrid composite resin (Synergy D6 (Coltene®)) and a conventional glass ionomer cement (Ketac ™ Fil Plus Aplicap ™ (3M ESPE)), randomly. Reviews were made at baseline and after 3 months-recall, carried out using the USPHS criteria. Statistically, the results were evaluated using the Wilcoxon test. Results: After 3 months, 6 restorations were lost. The results in term of Alfa score for composite and glass ionomer cement were, respectively: retention (100%; 83.3%), marginal discoloration (85.7%; 75%), marginal adaptation (50%; 58.3%), wear (92.9%; 75%), post-operative sensitivity (71.4%; 83.3%) and secondary caries (100%, 100%). By analysing the presence/absence of wear facet, it was found that the performance of both materials was similar, meaning that this feature didn’t influence significantly the results. Conclusion: Both materials showed similar performances, but in general, glass ionomer cement showed slightly higher quality losses.