Volumetric Shrinkage
Mostrando 1-12 de 21 artigos, teses e dissertações.
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1. Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
Abstract High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In thi
J. Appl. Oral Sci.. Publicado em: 18/06/2018
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2. A comparative study of bulk-fill composites: degree of conversion, post-gel shrinkage and cytotoxicity
Abstract: Bulk-fill composites are claimed to be restorative materials used in deep preparations and effectively photoactivated in layers up to 4 mm. The aim of the present study was to evaluate the degree of conversion, post-gel volumetric shrinkage, and cytotoxicity of six bulk-fill and two conventional composites. Degree of conversion was determined by FT
Braz. oral res.. Publicado em: 08/03/2018
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3. Hybrid Approach of Aortic Diseases: Zone 1 Delivery and Volumetric Analysis on the Descending Aorta
Abstract Introduction: Conventional techniques of surgical correction of arch and descending aortic diseases remains as high-risk procedures. Endovascular treatments of abdominal and descending thoracic aorta have lower surgical risk. Evolution of both techniques - open debranching of the arch and endovascular approach of the descending aorta - may extend a
Braz. J. Cardiovasc. Surg.. Publicado em: 2017-10
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4. Marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS)
Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations. Objective To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS). Material and Methods A base composite (B) was produced with an organic matrix with UDMA/
J. Appl. Oral Sci.. Publicado em: 2015-10
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5. Study of hygral behavior of non-asbestos fiber cement made by similar hatschek process
Fiber cement, similarly to all cementitious materials, undergoes dimensional and volumetric changes when it is exposed to dry and wet environments. When exposed to natural weathering, cement-based materials absorbs and may also release water to their surroundings via a very complex inherent pore structure. In this work initialized a few years ago, some prope
Mat. Res.. Publicado em: 05/11/2013
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6. Silorane- and high filled-based"low-shrinkage" resin composites: shrinkage, flexural strength and modulus
This study compared the volumetric shrinkage (VS), flexural strength (FS) and flexural modulus (FM) properties of the low-shrinkage resin composite Aelite LS (Bisco) to those of Filtek LS (3M ESPE) and two regular dimethacrylate-based resin composites, the microfilled Heliomolar (Ivoclar Vivadent) and the microhybrid Aelite Universal (Bisco). The composites
Braz. oral res.. Publicado em: 01/03/2013
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7. Propriedades de madeiras termorretificadas / Properties of thermalrectified wood
Heat treatment applied to the wood leads to the degradation and/or rearrangement of its principal chemical constituents, especially cellulose, hemicelluloses, and lignin, improving some properties such as dimensional stability, resistance to attack by wood decay organisms, and reducing the hygroscopicity. This occurs mainly by the OH groups degradation prese
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/05/2010
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8. Influência do consumo de água, do teor de adição de microfibras de polipropileno, e do tipo de cimento no fenômeno da retração por secagem em concretos empregados em pisos / Influence of water consumption, the addition content of polypropylene staple fibers and the kind of cement in the volumetric changes of concretes used in floors
Mudanças volumétricas presentes na matriz cimentícia, oriundas dos processos de hidratação e de secagem do compósito cimentício, geram uma tendência de fissuração no material. Em pisos de concreto, a presença de tal manifestação patológica, decorrente do fenômeno da retração por secagem, é extremamente preocupante. Desta forma, a realizaç�
Publicado em: 2010
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9. Surface Characterization Techniques applied in heat-treated wood / Utilização de técnicas de caracterização de superfícies em madeiras tratadas termicamente
The main aim of this work was the characterization of changes of properties occurred on the surface and structure of heat-treated wood in response to thermal treatments. In order to cover different types of heat-treated wood, two species were elected as models for two great groups of woods, the so-called hard and soft woods. The samples were thermally treate
Publicado em: 2009
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10. Influência dos teores de lignina, holocelulose e extrativos na densidade básica e na contração da madeira e no rendimento e densidade do carvão vegetal de cinco espécies lenhosas do cerrado
The objective of this study was to evaluate the influence of the chemical properties (content of lignin, holocellulose and extratives) of five species of woody cerrado (Pterodon pubescens, Dalbergia miscolobium, Sclerolobium paniculatum, Stryphnodendron adstringens and Vochysia thyrsoidea) on the density and shrinkage the wood in income and apparent density
Publicado em: 2008
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11. Agrupamento de 41 espécies de madeiras da Amazônia para secagem baseado em características anatômicas e físicas
This work aims to propose a method for grouping 41 Amazonian wood species for drying. Besides, it specifically aims: 1) to select from literature which physical and mechanical characteristics affect the drying process and to determine these selected properties for the 41 wood species; 2) to establish any meaningful correlation between the studied properties
Publicado em: 2008
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12. Volumetric polymerization shrinkage of contemporary composite resins
The polymerization shrinkage of composite resins may affect negatively the clinical outcome of the restoration. Extensive research has been carried out to develop new formulations of composite resins in order to provide good handling characteristics and some dimensional stability during polymerization. The purpose of this study was to analyze, in vitro, the
Journal of Applied Oral Science. Publicado em: 2007-10