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1.
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1558090

RESUMO

Dental composite resins may release bisphenol-A or similar molecules affecting patient health and the environment. This study measured bisphenol-A release from three commonly used in patients composite resins (Filtek™ Z350 XT, Filtek™ P60, Filtek™ Bulk Fill) immersed in three liquid mediums (artificial saliva, 0.001 M lactic acid and 15% ethanol) and assessed the changes in the surface micromorphology.The released BPA was measured by HPLC at basal time (t=0), 1 h, 1 d, 7 d and 30 d. Topographic analysis of specimens was performed by scanning electron microscopy (SEM). The data were analyzed using one-way ANOVA and Tukey post-hoc test (P < 0.05). BPA in solution increased significantly in the three DCRs immersed in 0.001 M lactic acid at all times. SEM micrographs of the specimen in 0.001 M lactic acid disclosed more structural defects than others. The surface of the three composite resins was morphologically affected by their immersion in all solutions. SEM evidenced that the dental materials underwent erosion and cracks with filler particles protruding from the surface. The morphological changes in tested dental materials produced by exposure to these solutions are potentially dangerous to patients by causing caries, infections, and partial loss of dental material.

2.
Rev. cuba. estomatol ; 52(3): 293-313, jul.-set. 2015. ilus
Artigo em Espanhol | LILACS | ID: lil-765766

RESUMO

Introducción: la población, solicita con frecuencia restauraciones compatibles con los estándares de la estética dental y ello en ocasiones se dificulta dada la diversidad de materiales restauradores existentes y técnicas para su aplicación. Objetivo: proponer recomendaciones para el empleo práctico de las resinas compuestas fotopolimerizables en restauraciones estéticas de dientes anteriores y posteriores. Métodos: se realizó un estudio de revisión bibliográfica sobre técnicas para el empleo de resinas compuestas en restauraciones estéticas. Esto se llevó a cabo a través de Scopus, SciELO, Hinari, Medline y 45 revistas científicas indexadas de manera manual. El estudio se circunscribió a 89 artículos y 3 libros que enfocaron esta temática de manera más integral. Se reagruparon todos los documentos revisados y se procesaron según revista científica de origen y año de publicación. Integración de la información: las recomendaciones incluyeron la valoración individual de la estética del paciente, selección del tipo de resina a emplear, selección del color, profilaxis y pulido de la superficie de trabajo, preparaciones cavitarias con o sin confección de biseles, protección o no del complejo dentino pulpar, grabado ácido, lavado y enjuague del ácido grabador, aplicación del adhesivo, inserción y manipulación de la resina compuesta, polimerización y acabado de la restauración. Consideraciones finales: los tratamientos curativos y estéticos son muy variado en el campo de las resinas compuestas fotopolimerizables, por lo cual resulta útil seguir, entre otras, las recomendaciones de realizar limpieza de la superficie de trabajo, seleccionar el color y tipo de resina indicados en cada caso, realizar preparaciones cavitarias mínimas con biseles (si es necesario), emplear incrementos en la realización de las restauraciones, polimerizar evitando grandes reacciones de contracción, y pulir adecuadamente las restauraciones(AU)


Introduction: patients often request the performance of restorations compatible with the standards of dental esthetics. This is sometimes hampered by the great variety of restoring materials and techniques for their application. Objective: propose recommendations for the use of photopolymerizable composite resins in esthetic restorations of anterior and posterior teeth. Methods: a bibliographic review was performed about techniques for the use of composite resins in esthetic restorations. The search was conducted in the databases Scopus, SciELO, Hinari and Medline, as well as 45 manually indexed scientific journals. The reviewers selected the 89 papers and 3 books which approached the topic in a more comprehensive manner. All the documents reviewed were arranged and processed by scientific journal and year of publication. Data integration: recommendations included the following topics: individual assessment of the patient's esthetic considerations, selection of the resin type to use, selection of color, prophylaxis and polishing of the work surface, cavity preparation with or without beveling, protection or not of the dentin-pulp complex, acid engraving, washing and rinsing of the engraving acid, application of the adhesive, insertion and manipulation of the composite resin, polymerization and finishing of the restoration. Final considerations: there is a great variety of curative and esthetic treatments based on the use of photopolymerizable composite resins. Therefore, it would be advisable to follow these recommendations, among others: clean the work surface, select the appropriate resin color and type, perform as few beveled cavity preparations as possible (only if required), apply increments while carrying out the restoration, polymerize avoiding great contraction reactions, and polish the restorations appropriately(AU)


Assuntos
Humanos , Resinas Compostas/uso terapêutico , Restauração Dentária Permanente/métodos , Estética Dentária , Literatura de Revisão como Assunto , Artigo de Revista
3.
Artigo em Espanhol | LILACS | ID: lil-708826

RESUMO

La técnica de grabado ácido en esmalte representa el hito que marca la puerta de entrada para el establecimiento de la odontología adhesiva. Producto de que el sustrato adamantino pudiese presentar comportamiento refractario a la técnica convencional de grabado ácido es que se plantea una técnica en dos tiempos operatorios, la cual pudiese disminuir dicho comportamiento resistente al grabado ácido y combatir así el fenómeno de la filtración marginal de las resinas compuestas. En este estudio se utilizaron 30 terceros molares sanos, en los cuales se realizaron cavidades clases V en las caras vestibulares y linguales/palatinas, las cuales fueron obturadas con resina compuestas utilizando técnica de grabado ácido convencional y técnica de grabado ácido en dos tiempos operatorios, respectivamente. Estos especímenes fueron sometidos a un proceso de termociclado en presencia de un agente colorante marcador. Luego de un proceso de termociclado, las muestras fueron cortadas transversalmente para evaluar el porcentaje de penetración del agente marcador. El análisis de los resultados demostró que las restauraciones realizadas con técnica de grabado ácido en dos tiempos operatorios presentaron menores valores de filtración marginal, existiendo diferencias significativas entre ambos grupos estudiados.


The acid etch technique is the fact that marks the starting point for the establishment of the adhesive dentistry era. But as the enamel structure may have a resistant behavior towards the conventional acid etch technique ,a two-step acid etch technique is presented. This would diminish the aforementioned resistant behavior of enamel to the conventional acid etch technique, and minimize as well, the marginal leakage phenomenon of the composite materials. In this study 30 sound recently extracted molars were used. Equal class V cavities preparations were made in the buccal and palatal/lingual faces of each tooth. Buccal cavities were filled with composite before the use of the conventional acid etch technique, as adhesive method, while in the lingual/palatal faces the two-step acid etch technique was used. The samples were subjected to thermal cycles in the presence of a dying agent. After the thermocycling process, the samples were cut transversely to assess the percentage of penetration of the staining agent. The analysis of the results showed that there was a significant statistical difference between both groups. Moreover the restorations made with the two-step acid etch technique presented lower values of marginal leakage.


Assuntos
Humanos , Infiltração Dentária , Condicionamento Ácido do Dente/métodos , Resinas Compostas/química , Técnicas In Vitro
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