Evaluation of Vickers hardness and depth of cure of six composite resins photo-activated with different polymerization modes

Poggio, Claudio; Lombardini, Marco; Gaviati, S; Chiesa, Marco

doi:10.4103/0972-0707.97946

Cited by 87 publications

(90 citation statements)

References 19 publications

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“…Higher ARI values are favorable for avoiding damage to the enamel, as the residue may be safely removed with suitable rotary instruments 31) . Hardness is defined as the resistance of a material to indentation or penetration 32) . VHN and CD were recorded "in situ" in our study, allowing us to detect differences among the cements with regard to bracket type.…”

Section: Discussionmentioning

confidence: 99%

Influence of the bracket on bonding and physical behavior of orthodontic resin cements

et al. 2015

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The aim of the study is to determine the influence of the type of bracket, on bond strength, microhardness and conversion degree (CD) of four resin orthodontic cements. Micro-tensile bond strength (µTBS) test between the bracket base and the cement was carried out on glass-hour-shaped specimens (n=20). Vickers Hardness Number (VHN) and micro-Raman spectra were recorded in situ under the bracket base. Weibull distribution, ANOVA and non-parametric test were applied for data analysis (p<0.05). The highest values of ή as well as the β Weibull parameter were obtained for metallic brackets with Transbond™ plastic brackets with the self-curing cement showing the worst performance. The CD was from 80% to 62.5%.

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Section: Discussionmentioning

confidence: 99%

Influence of the bracket on bonding and physical behavior of orthodontic resin cements

et al. 2015

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“…Para o método Convencional e Pulse delay as duas superfícies tiveram um comportamento estatisticamente semelhante. Resultados semelhantes foram encontrados por Poggio et al [19] . Para estes autores resultados assim dependem da quantidade total de energia que atinge a camada de compósito e na composição química dos mesmos.…”

Section: Discussionunclassified

Influência de três modos de fotopolimerização sobre a microdureza de três resinas compostas

et al. 2016

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ResumoA adequada fotopolimerização das resinas compostas é fundamental para obtenção de uma boa dureza capaz de resistir aos esforços mastigatórios. Assim, o objetivo deste estudo foi avaliar a influência das técnicas de fotopolimerização -Convencional (CONV), Soft-start (SS) e Pulso atrasado (PA) na microdureza Knoop de três resinas compostas. Para a confecção dos corpos-de-prova foram utilizadas as resinas compostas Filtek Z350 (3M ESPE), Empress Direct (IvoclarVivadent) e P90 (3M ESPE). Foram obtidos nove grupos experimentais em função da técnica de polimerização e resina composta. Vinte e quatro horas após a fotopolimerização foi realizado o teste de microdureza Knoop nas superfícies de base e topo de cada corpo-de-prova. Assim, os valores obtidos foram submetidos ao teste de Kruskall Wallis, seguido do teste de Dunn, p < 0,05. A eficácia da polimerização na superfície de topo das resinas compostas testadas não foi afetada pelos diferentes modos de polimerização. A resina composta Empress Direct apresentou os mais baixos valores de dureza para todos os modos de polimerização quando comparada às demais resinas compostas avaliadas. Palavras-chave: fotopolimerização, dureza knoop, resina composta. AbstractProper curing of composites is critical to obtaining good toughness able to withstand masticatory forces. The objective of this study was to evaluate the influence of curing techniques -conventional (CONV), Soft -start (SS) and Pulse delayed (PA) in microhardness of three composites. To make up the body-of -evidence were used composites Filtek Z350 (3M ESPE), Empress Direct (IvoclarVivadent) and P90 (3M ESPE). Nine experimental groups were obtained according to the polymerization technique and composite resin. Twenty -four hours after curing was performed Knoop microhardness test surfaces of base and top of each body -of -evidence. Thus, the values obtained were subjected to the Kruskal Wallis test followed by Dunn's test, p < 0.05. The effectiveness of the polymerization on the top surface of the composites tested was not affected by different modes of polymerization. The Empress Direct composite resin showed the lowest hardness values for all modes of polymerization compared to other composites evaluated.

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“…The depth of cure was assessed by calculating the hardness ratio of the bottom to the top surface (%) [22]. Statistical data tests were conducted using one-way ANOVA followed by post hoc Fisher's LSD with a significance value of p<0.05 for light-curing distance treatment and resin thickness treatment.…”

Section: Research Articlementioning

confidence: 99%

Light-Curing Distance and Resin Thickness Effects on the Shortfiber–reinforced Resin Composites’ Depth of Cure

et al. 2018

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Objective: This study evaluated the light-curing distance and resin thickness effects on the depth of cure of short fiber-reinforced resin composites (SFRCs). Methods:Fifteen SFRC specimens with a diameter of 6 mm and thickness of 4 mm were divided into groups (n=5) with light-curing distances of 0, 2, and 4 mm. Another 15 specimens with a diameter of 6 mm and thicknesses of 3, 4, and 5 mm (n=5) were subjected to a 0-mm light-curing distance. Microhardness tests were conducted using a Vickers hardness tester (load: 200 g; dwell time: 15 s), and the depth of cure was assessed by calculating the hardness ratio of the bottom to the top surface (%). Statistical tests included one-way analysis of variance (ANOVA) followed by post hoc Fisher's LSD tests. Results:The depths of cure with 0-, 2-, and 4-mm light-curing distances were 79.0±0.7%, 77.0±0.6%, and 75.0±0.8%, while those with thicknesses of 3, 4, and 5 mm were 81.0±1.0%, 78.2±1.0%, and 34.4±2.0%, respectively. Significant differences (p<0.05) in the depth of cure were found in all groups. Conclusion:A depth of cure >80% was only attained with a 3-mm resin thickness and 0-mm light-curing distance.

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Evaluation of Vickers hardness and depth of cure of six composite resins photo-activated with different polymerization modes

Cited by 87 publications

References 19 publications

Influence of the bracket on bonding and physical behavior of orthodontic resin cements

Influence of the bracket on bonding and physical behavior of orthodontic resin cements

Influência de três modos de fotopolimerização sobre a microdureza de três resinas compostas

Light-Curing Distance and Resin Thickness Effects on the Shortfiber–reinforced Resin Composites’ Depth of Cure

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