Knoop Hardness
Mostrando 13-24 de 127 artigos, teses e dissertações.
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13. Influence of polymeric matrix on the physical and chemical properties of experimental composites
Nowadays, the main reasons for replacement of resin-based composite restorations are fracture or problems with the integrity of their interface, such as marginal staining, microleakage, or secondary caries. The aim of the present study was to evaluate the influence of the organic matrix on polymerization stress (PS), degree of conversion (DC), elastic modulu
Braz. oral res.. Publicado em: 2015
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14. Long-term bond strength, degree of conversion and resistance to degradation of a HEMA-free model adhesive
Aim: To evaluate the long-term bond strength, degree of conversion and resistance to degradation in ethanol of HEMA-containing and HEMA-free model adhesive resins of a three-step etch-and-rinse adhesive system. Methods: The superficial dentin of 16 bovine incisor teeth was exposed, and the teeth were divided in two groups according to the HEMA concentration
Braz. J. Oral Sci.. Publicado em: 2014-12
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15. Influence of mouthwashes on the physical properties of orthodontic acrylic resin
AIM: The aim of this study was to evaluate the influence of acrylic resin immersion in different mouthwashes on hardness, roughness and color. METHODS: Specimens of an orthodontic self-cured acrylic resin (Orto Clas(r)) were produced and immersed in five mouthwashes: Plax(r) Classic (Colgate(r)); Plax(r) alcohol-free (Colgate(r)); Listerine(r) (Johnson
Braz. J. Oral Sci.. Publicado em: 2014-09
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16. Radiant exposure effects on physical properties of methacrylate - and silorane-composites
AIM: To evaluate the effect of different radiant exposures on the degree of conversion (DC), Knoop hardness number (KHN), plasticization (P), water sorption (WS), and solubility (S) of different monomer resin-based composites. METHODS: Circular specimens (5 x 2 mm) were manufactured from methacrylate and silorane composite resins, and light-cured at 19
Braz. J. Oral Sci.. Publicado em: 2014-09
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17. Influence of light-exposure methods and depths of cavity on the microhardness of dual-cured core build-up resin composites
Objective: The purpose of this study was to evaluate the Knoop hardness number (KHN) of dual-cured core build-up resin composites (DCBRCs) at 6 depths of cavity after 3 post-irradiation times by 4 light-exposure methods. Material and Methods: Five specimens each of DCBRCs (Clearfil DC Core Plus [DCP] and Unifil Core EM [UCE]) were filled in acrylic resi
J. Appl. Oral Sci.. Publicado em: 2014-01
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18. Do new matrix formulations improve resin composite resistance to degradation processes?
The aim of this study was to determine the degradation resistance of three new formulations-silorane-, Ormocer- and dimer-acid-based materials-and compare them to the traditional dimethacrylate-based materials. One silorane- (Filtek P90, P90), one Ormocer- (Ceram-X, CX), one dimer-acid- (N'Durance, ND) and two dimethacrylate-based (Filtek P60, P60; Tetric Ce
Braz. oral res.. Publicado em: 2013-09
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19. Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements
This study evaluated: I) the effect of photo-activation through ceramics on the degree of conversion (DC) and on the Knoop hardness (KHN) of light- and dual-cured resin cements; and II) two different protocols for obtaining the spectra of uncured materials, to determine the DC of a dual-cured resin cement. Thin films of cements were photo-activated through c
Braz. oral res.. Publicado em: 2013-09
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20. Performance of digital radiography with enhancement filters for the diagnosis of proximal caries
Enhancement filters are potentially supposed to improve the diagnostic performance of digital images. Thus, the aim of this study was to compare the performance of digital radiography with and without enhancement filters for the detection of induced proximal caries lesions. The total sample consisted of 120 sound human teeth (40 premolars, 80 molars). Enamel
Braz. oral res.. Publicado em: 2013-06
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21. Erosive potential of industrial orange beverage in deciduous enamel and glass ionomer cements (in vitro) / POTENCIAL EROSIVO DE BEBIDAS INDUSTRIALIZADAS DE LARANJA SOBRE O ESMALTE DECÍDUO E CIMENTOS IONOMÉRICOS (IN VITRO)
Este estudo, in vitro, tem por objetivo determinar o potencial erosivo de bebidas industrializadas de laranja sobre o esmalte decíduo, cimento de ionômero de vidro de alta viscosidade Ketac Molar EasyMixTM - (CIV) e cimento de ionômero de vidro modificado por resina - VitremerTM - (CIV-MR), através da alteração da microdureza e rugosidade superficial.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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22. Análise das propriedades de materiais infiltrantes em função da composição : monômeros base e antimicrobiano / Analysis of composition properties of infiltrant materials : base monomers and antimicrobial
Esta dissertação foi dividida em dois capítulos: Capítulo 1 avaliou a atividade antimicrobiana de misturas não polimerizadas e polimerizadas por meio da mensuração da zona de inibição após difusão em ágar (Pour Plate); e determinou a Concentração Inibitória Mínima (CIM) e Concentração Mínima Bactericida (CMB) de misturas resinosas experime
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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23. Maximum tensile strength and hardness of conventional glass ionomer materials and resin-modified. / Resistência à tração máxima e microdureza de materias ionoméricos convencionais e modificados por resina.
Este estudo avaliou a resistência à tração máxima (RTmax) e microdureza (μKH) de materiais ionoméricos convencionais (CO) e modificados por resina (RM). Sendo nove espécimes para RTMAX e doze para μdur, foram avaliadas as seguintes marcas: Resiglass (Biodinâmica), Ionoseal (Voco), Vitremer (3M ESPE - MR), Chemfil Rock (Dentsply Caulk), Vitr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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24. INFLUÊNCIA DE DIFERENTES TRANSLUCIDEZ DAS CERÂMICAS SOBRE O GRAU DE CONVERSÃO E MICRODUREZA DE UM CIMENTO RESINOSO DUAL / Influence of different ceramic translucency on the degree of conversion and microhardness of dual resin cement
The proposition of this study was to evaluate the influence of different ceramic translucency on the degree of conversion and Knoop microhardness of dual resin cement. It was made 150 samples of the resin cement dual cured Variolink II (shade A3; 5 mm in diameter and 1 mm thick) were created with interposing ceramic discs with 8 mm in diameter and 1.5 mm thi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/02/2012