RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD

REVISIÓN DEL ESTADO ACTUAL DE RESINAS COMPUESTAS BULK-FILL key words: "Bulk Fill", "Bulk Fill Resin", "Bulk Fill Composite(s)", "Bulk Fill Dental". La mayoría de los composites de uso en Odontología corresponden Palabras clave: Resinas compuestas, relleno inorgánico, matriz. RESINAS FLUIDAS Y CONDENSABLES RESINA FLUIDA: Son materiales de baja viscosidad, que contienen partículas de relleno pequeñas.


RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD

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RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD


Y por ultimo, el efecto de la agitacion, condicion en la que cuando se agitan violentamente, forman espuma por la baja tension superficial que presentan las soluciones de proteinas, lo que hace que se favorezca su desnaturalizacion.

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Louis, USA en nuestro medio, pues fue evidente su elevado costo y dificultad de consecucion, al igual que ocurre con cualquier tipo de enzima antioxidante de caracteristicas similares como la catalasa u otros tipos de peroxidasa derivadas de sangre, levadura o habichuela.

La presentacion de resinas compuestas en odontologia peroxidasa de polvo liofilizado requirio una preparacion en una solucion amortiguadora de fosfato, a pH de 7 como medio estable para que hiciera su accion catalitica sin desnaturalizarse, y poder conseguir una preparacion liquida o gel de facil aplicacion, ademas fue necesario el riguroso almacenamiento a [grados]C, transporte cuidadoso de la enzima, y el tiempo de resinas compuestas en odontologia prolongado para el envio del producto a nuestro pais; estas limitaciones hacen sugerir la posibilidad de busqueda de nuevas resinas compuestas en odontologia para la produccion de la enzima a menor costo, con facilidades de adquisicion y distribucion, aislando la enzima directamente de productos que se puedan obtener de forma practica o con un proceso sencillo de separacion de la misma en el laboratorio.

Los hallazgos se consideran importantes en cuanto a su alcance, ya que aportan evidencia significativa para resinas compuestas en odontologia en procedimientos clinicos que disminuyan los efectos nocivos de los agentes blanqueadores, pues pese a las multiples investigaciones que demuestran las alteraciones resinas compuestas en odontologia niveles fisiologico, quimico, 7, 9, 54 mecanico 1,13, 20, 55 y estructural6, 12 por accion de peroxidos, sigue siendo uno de los tratamientos esteticos mas solicitados por los pacientes y mas ejecutados por los odontologos en la actualidad.

A rational and responsible use of such agents has been promoted, as well as selecting products that have been thoroughly resinas compuestas en odontologia, in order to provide safe and successful treatments while minimizing side unwanted effects.

Enamel alterations reported by some studies include increased porosity, fissure formation, surface erosion, and demineralization zones at interprismatic areas, as well as alterations in terms of chemical composition and mechanical properties.

RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD

Nevertheless, some methods for neutralizing residual oxygen free radicals have been tested in order to reverse the unwanted physicochemical effects on resinas compuestas en odontologia dental structure and enamel substrate adhesion.

The samples were stored in proper conditions for a period no greater than three months. Ethical considerations of sample collection, handling and disposal were respected, thus complying with Ministry of Health Resolution of23 which considers this study to be of minimum risk; patients provided a signed consent for donating their teeth specifically for this study, which was approved by the Ethics Committee of Universidad Nacional de Colombia's Resinas compuestas en odontologia of Dentistry.

RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD

The samples were fixed on 0. The teeth were introduced in acrylic resin casts in resinas compuestas en odontologia to shape cube-like supports that later facilitated their insertion in the Shimadzu AG-SI Series testing machine.

The adhesive area was previously delimited by means of a Contact[R] paper circle with a central hole of 2 mm in diameter.

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The samples were sorted out in three groups: This solution was stored at a temperature of [degrees]C until it was used; at that moment, a thin layer of it was applied to the dental surface, letting it work for 15 min. Distilled water was used to rinse the samples; their resinas compuestas en odontologia were dried with paper towels, and a conventional adhesion process was resinas compuestas en odontologia.

After surface treatment and composite resin adhesion, each sample was tested at the Shimadzu AG-IS Series universal testing machine, setting the section sheet at 0,5 mm from the adhesive interface.

Surface treatment per group and adhesion to dental enamel shear bond strength in Mpa. Data analysis was performed by means of a nonparametric test based on ANOVA Kruskal-Wallis one-way ranks in order to contrast the hypothesis of equality of treatment medians, and later with a non-parametric Mann-Whitney test to contrast the hypothesis of equality of the groups under study, by using the Social Sciences Statistical Package SPSS, Central tendency measures mean and standard resinas compuestas en odontologia were used to condense data presentation per group.

These results show that group 1 adhesion presented a greater shear bond strength, resinas compuestas en odontologia a value of Application of peroxidase after whitening in group 3 produced a recovery of The tests demonstrated a shear bond strength decrease of 8.

This proves that using whitening agents with high concentrations of hydrogen peroxide during the times indicated by manufacturers reduces the composite resin's bond strength to dental enamel.

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This phenomenon has been analyzed by authors such resinas compuestas en odontologia Bulut et al, 24 Miles et al, 25 resinas compuestas en odontologia McGuckin et al, 26 who have explained this effect by the presence of residual peroxide or oxygen released by whitening agents-which inhibit the polymerization process of adhesion systems and composite resins-as well as by alterations of the enamel surface structure associated to erosion of the aprismatic layer and to lack of calcium and phosphorous.

And this includes fluoride ions which favor the formation of crystals, thus providing a more stable base for adhesion. Moreover, the concentration gradients of the enamel mineralization solution are small, which explains the slow diffusion inside the structure; 32 this is why it seems reasonable to wait the time recommended by authors such as Shinohara et al, 29 Basting et al, 33 and Cavalli et al 34 in resinas compuestas en odontologia to recover an enamel surface with less apparent changes.

Clinical situations such as old restorations in the anterior sector-that affect aesthetic appearance-- the need of starting orthodontic treatment or simply patient's availability for a cosmetic treatment that requires adhesive post-whitening precedures, 25, 35 mean a difficult situation to the clinician at the moment of deciding whether to perform restorative treatment instead of waiting for some reasonable time to proceed with post-whitening adhesion.

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In consequence, dentists need to find resinas compuestas en odontologia way of performing adhesive restorations right after the whitening procedure without risk of failing.

Villarreal resinas compuestas en odontologia al 15 maintain that the concomitant use of antioxidant substances reduces the adverse effect on resins' bond strength to enamel as well as morphological and chemical changes.

Lai et al, 39 Turkun et al, 19 and Feiz et al 38 demonstrated that submerging samples in water for 24 hours 39 and using an antioxidant agent as sodium ascorbate inhibits the decrease of composite resins bond strength after whitening.

RESINAS COMPUESTAS EN ODONTOLOGIA PDF DOWNLOAD

Peroxidase has also been tested in studies by Bowles et al 40 and Gimeno et al, 41 who demonstrated that its use during or immediately after whitening with hydrogen peroxide may prevent harmful effects on soft tissues of resinas compuestas en odontologia oral cavity and the pulp canal.

The studies by Masakiet al, 42 Spector et al, 43 and Bjorkman et al 44 on fibroblasts, resinas compuestas en odontologia and thyroid cell cultures demonstrated a protective effect on tissues thanks to the use of catalase and peroxidase in presence of oxygen free radicals.

Being a molecule of They explain this finding by the catalase's mode of action, which requires a reduced number of molecules to produce its enzymatic effect. However, the authors point out that none of resinas compuestas en odontologia two enzymes has the capacity of entirely neutralize harmful effects, as bond strength was significantly lower than in the negative control group, thus concluding that using a more concentrated solution might yield better results.