Influence of Different Ceramics on Resin Cement Knoop Hardness Number

Borges, Gilberto Antônio; Agarwal, Parul Mour; Miranzi, Benito André Silveira; Platt, Jeffrey A.; Valentino, Thiago Assunção; Santos, Paulo Henrique dos

doi:10.2341/07-155

Cited by 35 publications

(57 citation statements)

References 20 publications

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“…The effect of the ceramic microstructure on the properties of resin cements has also been previously reported in the literature. 18 The opacity, rather than the thickness, seems to be the main factor accounting for the differences found in DC and KHN among the groups in the present study. However, the thickness of indirect materials interposed during photo-activation is a key factor for light attenuation, and polymerization generally decreases as thickness increases.…”

Section: Discussionmentioning

confidence: 58%

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Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

et al. 2013

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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 photoactivated through ceramics [feldspathic porcelain (FP); lithium disilicate glass-ceramics of low translucency (e.max-LT), medium opacity (e.max-MO) and high translucency (e.max-HT); glass-infiltrated alumina composite (IC) and polycrystalline zirconia (ZR)] with thicknesses of 1.5 and 2.0 mm. DC was analyzed by Fourier transform infrared (FTIR) spectroscopy. Two protocols were used to obtain the spectra of the uncured materials: I) base and catalyst pastes were mixed, and II) thin films of base and catalyst pastes were obtained separately, and an average was obtained. KHN assessment was performed with cylindrical specimens. The results were analyzed by ANOVA and Tukey's test (α = 0.05). The light-cured cement showed higher DC (61.9%) than the dual-cured cement (55.7%). The DC varied as follows: FP (65.4%), e.max-HT (65.1%), e.max-LT (61.8%), e.max-MO (60.9%), ZR (54.8%), and IC (44.9%). The light-cured cement showed lower KHN (22.0) than the dual-cured (25.6) cement. The cements cured under 1.5 mm spacers showed higher KHN (26.2) than when polymerized under 2.0 mm ceramics (21.3). Regarding the two protocols, there were significant differences only in three groups. Thus, both methods can be considered appropriate. The physical and mechanical properties of resin cements may be affected by the thickness and microstructure of the ceramic material interposed during photo-activation.

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Section: Discussionmentioning

confidence: 58%

“…3,18,21,22 Overall, they correlated low KHN to low values of DC. However, in addition to the C = C conversion, indirect activation through ceramic materials may affect hardness by reducing the intensity of the light reaching the cement, favoring the formation of polymers with a small number of cross-link bonds.…”

Section: Discussionmentioning

confidence: 99%

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

et al. 2013

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“…Isso está relacionado ao modo de ativação da luz à quantidade e à eficiência do componente químico 12 . Além disso, características relacionadas com a cerâmica, tais como espessura do material, translucidez, índice de refração e composição cristalina da cerâmica, são capazes de influenciar a intensidade de luz que alcança o cimento resinoso, alterando, consequentemente, o seu grau de conversão 3,13 .…”

Section: Discussionunclassified

Efeito da intensidade de fontes de luz e barreiras de cerâmica na microdureza de cimento resinoso dual

Fonseca

Correia

Griza

et al. 2015

Rev. odontol. UNESP

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<title>Resumo</title><sec><title>Introdução</title>O cimento resinoso dual é o principal material para cimentação de cerâmicas. Contudo, fatores, como fonte de luz, podem influenciar no desempenho do cimento.</sec><sec><title>Objetivo</title>Avaliar a influência de duas fontes de luz de diferentes intensidades sobre a microdureza de um cimento resinoso quando fotoativado sob diferentes cerâmicas.</sec><sec><title>Material e método</title>Foram fotoativados 40 espécimes de cimento resinoso dual (10 mm × 1,0 mm) por meio de duas fontes de luz LED, com intensidades de 1.000 mW/cm² e 800 mW/cm² durante 40 segundos, sob cerâmicas (15 mm × 2 mm) à base de zircônia, espinélio MgAl2O4 e dissilicato de lítio. No grupo controle, foi utilizada uma placa de vidro de mesma dimensão. As amostras tiveram a superfície regularizada com lixa d`água (600 e 1200). Após armazenagem a seco no escuro (24 h), foram realizadas as medidas de microdureza Vickers (HMV Shimadzu - 50g/10 segundos). Os dados foram submetidos à Anova fatorial e ao teste de Tukey com nível de significância de 5%.</sec><sec><title>Resultado</title>O cimento polimerizado apresentou valor médio de microdureza e desvio padrão para o grupo controle de 43,9±1,5 e 43,4±1,3, para as intensidades de 1.000 mW/cm2 e 800 mW/cm2, respectivamente. O menor valor de microdureza do cimento foi observado para a cerâmica à base de espinélio MgAl2O4, polimerizado a 800 mW/cm², com valor de 34,3±3,3.</sec><sec><title>Conclusão</title>O tipo de cerâmica e a intensidade da fonte de luz influenciam na microdureza do cimento. A intensidade de 1.000 mW/cm2 sobre as cerâmicas à base de zircônia e espinélio MgAl2O4 resultaram na melhor combinação de valores de dureza do cimento.</sec>

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“…1 The advent of new ceramic materials has led to a greater demand for their use as they enhance biometric qualities such as enamel structure, biocompatibility, longevity, mechanical strength, and chemical stability. 2 In some situations where the dental structure is absent or has little coronal structure remaining, it may be necessary to recommend a crown. One can consider metal-free crowns to obtain a better esthetic, using reinforced ceramic (with alumina, zirconia, or lithium disilicate, among others), which provides more mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Ceramic Fragments and Metal-free Full Crowns: A Conservative Esthetic Option for Closing Diastemas and Rehabilitating Smiles

Miranda

Olivieri

Rigolin

et al. 2013

Operative Dentistry

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SUMMARY Dental ceramics make it possible to restore anterior teeth that have been esthetically compromised, presenting a high resistance to wear, biocompatibility, color stability, and low thermal conductivity. The development of different types of ceramic and techniques for adhesive cementation have made it possible to produce more conservative restorations without involving the healthy dental structure and with minimally invasive preparation, such as the bonding of ceramic fragments. The purpose of this article is to describe a clinical case in which diastemas were closed by using nanofluorapatite ceramic (e.max Ceram, Ivoclar-Vivadent) fragments on teeth 7 and 10 with minimal tooth preparation and metal-free ceramic crowns (e-max Ceram) reinforced with zirconia copings through a computer-aided design/computer-aided manufacturing system (Lava, 3M-ESPE) on teeth 8 and 9.

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Influence of Different Ceramics on Resin Cement Knoop Hardness Number

Abstract: SUMMARY

Cited by 35 publications

References 20 publications

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

Influence of the interposition of ceramic spacers on the degree of conversion and the hardness of resin cements

Efeito da intensidade de fontes de luz e barreiras de cerâmica na microdureza de cimento resinoso dual

Ceramic Fragments and Metal-free Full Crowns: A Conservative Esthetic Option for Closing Diastemas and Rehabilitating Smiles

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