Dental Resins
Mostrando 49-60 de 131 artigos, teses e dissertações.
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49. Influence of light energy density on heat generation during photoactivation of dental composites with different dentin and composite thickness
OBJECTIVE: The aim of this study was to determine the influence of different energy densities on the heat generated during photoactivation of Filtek Z250 (3M/ESPE) and Z100 (3M/ESPE) composite resins with different dentin and composite thickness. MATERIAL AND METHODS: The temperature increase was registered with a type-K thermocouple connected to a digital t
Journal of Applied Oral Science. Publicado em: 2009-08
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50. The interaction of polyacid-modified composite resins ("compomers") with aqueous fluoride solutions
OBJECTIVE : The aim of this study was to investigate how the release of fluoride from two compomers and a fluoridated composite resin was affected by exposure to KF solution. MATERIAL AND METHODS: Two compomers (Dyract AP and Compoglass F) and one fluoridated composite (Wave) were prepared as discs (6 mm diameter and 2 mm thick), curing with a standard denta
Journal of Applied Oral Science. Publicado em: 2009-06
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51. Resistencia ao impacto da união dente-resina acrilica sob efeito da desinfecção simulada por energia de microondas / Effect of simulated microwave disinfection on bond strength of acry teeth and denture base resins
The aim of this study was to evaluate the effect of microwave disinfection in bond strength of acrylic teeth and a denture base resin. A hundred sixty rectangular wax patterns (30x15x5mm) were embedded in flasks with type III dental stone. After cristalization, the resulting moulds were filled with laboratorial silicone (Zetalabor), in which a molar acrylic
Publicado em: 2009
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52. Efeito do tempo e tipo de fotoativação e da ciclagem mecanica e termica na infiltração marginal de restaurações adesivas / Effect of light polimerization mode, time and mechanical and thermal load cycling on microleakage in adhesive restorations
The maintenance of the bond integrity between tooth and resin systems is important for the clinical success of composite resin restorations. Thus, the aim of this "in vitro" study composed of two manuscripts, was to evaluate the microleakage of Class II dental restorations: 1) made with an adhesive system and a dental composite, varying light curing time and
Publicado em: 2009
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53. Influence of shade on light trannmission and mechanics propriety of resin composite / Influencia da cor na passagem de luz e relação com propriedades mecanicas de compositos
For many types and shades of resin, a high degree of cure is not achieved through a 2 mm thickness photo-activated resin composite. The study was divided into two Chapters in order to make the objectives clearer. Chapter 1: The aim was to investigate the influence of different composite resin shades on light transmission through the composite and the differe
Publicado em: 2009
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54. In vitro shear bond strenght evaluation of lingual brackets bonding with different resin thicknesses. / AVALIAÇÃO IN VITRO DA RESISTÊNCIA DA COLAGEM DE BRAQUETES LINGUAIS COM DIFERENTES ESPESSURAS DE RESINA
Este estudo avaliou a colagem de braquetes linguais nas faces linguais de pré-molares superiores com diferentes espessuras de PADs, confeccionados com a resina fotopolimerizável Transbond XT nas espessuras de 1,0 mm e 2,0 mm e comparando-os com a menor espessura possível. Foi utilizado o adesivo Sondhi Rapid Set para a colagem indireta. Avaliou-se a forç
Publicado em: 2009
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55. DUREZA KNOOP DE UMA RESINA COMPOSTA: INFLUÊNCIA DA FOTOATIVAÇÃO POR LUZ HALÓGENA OU LED, DO TEMPO DE ARMAZENAGEM E DO LOCAL DE MEDIÇÃO / Composite Microhardness: Halogen or LED Fotoactivation, Elapsed Time and Microhardness Reading Location influence
This study aimed to investigate the influence of the reading location, expended time and light source on the Knoop hardness values of a composite resin. For that purpose, an hybrid composite Filtek Z250 - UD (3M/ESPE) was used. The preparation of 40 Cylindrical samples, 6mm in diameter and 2mm high was carried out in a stainless steel matrix. Samples was fot
Publicado em: 2009
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56. Shrinkage reduction in dental resins and composites by addition of polymeric crosslinked nanoparticles / Redução da contração de polimerização em resinas e compositos odontologicos pela adição de nanoparticulas polimericas reticuladas
Neste estudo foi avaliado o efeito da adição de nanopartículas poliméricas reticuladas (nanogéis) em resinas e compósitos odontológicos baseados em dimetacrilatos na contração volumétrica de polimerização. As partículas poliméricas foram sintetizadas utilizando mistura dos monômeros uretano dimetacrilato e isobornil metacrilato (razão 30:70 m
Publicado em: 2009
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57. Effect of the artificial accelerated aging on optical properties and conversion degree of expired composites / Efeito do envelhecimento artificial acelerado sobre as propriedades opticas e a conversão monomerica de compositos vencidos
Presently, the excellent aesthetic results obtained with composites require the dentist to use several composite resin hues to make a restoration. Nonetheless, to do this, little material is used, and many times, due to this low usage, the composite reaches its expiration date with material remaining in the packaging. The purpose of this study was to evaluat
Publicado em: 2009
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58. Avaliação da retenção de pinos de fibra de vidro reembasados (pinos anatomicos) e não reembasados cimentados em diferentes condições / Evaluation of relined (anatomic post) and non relined fiber glass posts retention cemented in different conditions
This study evaluated the effect of the relining (anatomic posts), of type cements and the length of the luting on the retention of fiber glass posts. One hundred and eighty bovine incisors were selected, their coronary portion removed, and the canals endodontically treated. After endodontic treatment, the canals were extended with diamonds burs nº 4138 and
Publicado em: 2009
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59. Analise fotoelastica da tensão de contração ocorrida na polimerização de compositos resinosos / Photoelastic analysis of polymerization shrinkage stress in resin composites
O objetivo deste trabalho foi comparar a tensão de contração de polimerização gerada por compósitos resinosos em diferentes tempos após a fotoativação, por meio de análise fotoelástica. Três compósitos experimentais com diferentes tipos de fotoiniciadores, e dois compósitos comerciais, sendo um à base de monômeros metacrilatos e o outro à ba
Publicado em: 2009
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60. Investigação na resitencia da união de sistemas adesivos dentarios irradiados com diferentes radiações ionizantes / Investigation of bond strength of dental adhesive systems irradiated with ionizing radiations
No presente estudo, materiais adesivos com diferentes modos de aplicação foram submetidos à ação de radiações ionizantes de diferentes energias com o objetivo de verificar a resistência adesiva após irradiação, por meio do ensaio de microcisalhamento, avaliando o padrão de fratura, considerando se as radiações utilizadas podem ser agentes exter
Publicado em: 2009