Light curing through glass ceramics: effect of curing mode on micromechanical properties of dual-curing resin cements

Flury, Simon; Lussi, Adrian; Hickel, Reinhard; Ilie, Nicoleta

doi:10.1007/s00784-013-1051-y

Cited by 27 publications

(29 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The specimens were kept in the box at 100% humidity in an incubator at 37°C (Memmert UM 500, Schwabach, Germany) for 15 min, allowing time for the autocuring polymerization process of the dual-curing materials to proceed. The first measurement of the micromechanical properties Vickers hardness ( H V ) and indentation modulus ( E IT ) were then made, and H V (in N/mm 2 ) and E IT (in GPa) were determined simultaneously with an automatic microhardness indenter device (Fischerscope HM2000, Helmut Fischer GmbH, Sindelfingen, Germany) in analogy to DIN 50359-1:1997-10 [15] and as previously described [16, 17]. All measurements were performed in force-controlled mode for 50 s with the test load increasing and decreasing between 0.4 and 500 mN at constant speed.…”

Section: Methodsmentioning

confidence: 99%

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Peutzfeldt

Lussi

Flury

2016

BioMed Research International

Self Cite

View full text Add to dashboard Cite

This study investigated the influence of light-curing at high irradiances on micromechanical properties of resin cements. Three dual-curing resin cements and a light-curing flowable resin composite were light-cured with an LED curing unit in Standard mode (SM), High Power mode (HPM), or Xtra Power mode (XPM). Maximum irradiances were determined using a MARC PS radiometer, and exposure duration was varied to obtain two or three levels of radiant exposure (SM: 13.2 and 27.2 J/cm2; HPM: 15.0 and 30.4 J/cm2; XPM: 9.5, 19.3, and 29.7 J/cm2) (n = 17). Vickers hardness (H V) and indentation modulus (E IT) were measured at 15 min and 1 week. Data were analyzed with nonparametric ANOVA, Wilcoxon-Mann-Whitney tests, and Spearman correlation analyses (α = 0.05). Irradiation protocol, resin-based material, and storage time and all interactions influenced H V and E IT significantly (p ≤ 0.0001). Statistically significant correlations between radiant exposure and H V or E IT were found, indicating that high-irradiance light-curing has no detrimental effect on the polymerization of resin-based materials (p ≤ 0.0021). However, one resin cement was sensitive to the combination of irradiance and exposure duration, with high-irradiance light-curing resulting in a 20% drop in micromechanical properties. The results highlight the importance of manufacturers issuing specific recommendations for the light-curing procedure of each resin cement.

show abstract

Section: Methodsmentioning

confidence: 99%

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Peutzfeldt

Lussi

Flury

2016

BioMed Research International

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although the curing time is shortened thanks to the use of multiple diodes, one major negative feature of this third-generation unit is its high power intensity. Flury et al10 noted that most LCUs utilize LED technology with a single high-powered diode (second-generation), which typically reaches irradiances of 1,200 to 1,500 mW/cm 2 ; however, VALO® shows irradiances of up to 3,200 mW/cm 2 when using the plasma curing mode. Spranley et al11 reported that this VALO® caused curing-light burns to soft tissues, whereupon patients had lip burns after routine restorative treatments, despite their lips being covered by rubber dams.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the bonding strengths of second- and third-generation light-emitting diode light-curing units

et al. 2016

View full text Add to dashboard Cite

ObjectiveWith the introduction of third-generation light-emitting diodes (LEDs) in dental practice, it is necessary to compare their bracket-bonding effects, safety, and efficacy with those of the second-generation units.MethodsIn this study, 80 extracted human premolars were randomly divided into eight groups of 10 samples each. Metal or polycrystalline ceramic brackets were bonded on the teeth using second- or third-generation LED light-curing units (LCUs), according to the manufacturers’ instructions. The shear bond strengths were measured using the universal testing machine, and the adhesive remnant index (ARI) was scored by assessing the residual resin on the surfaces of debonded teeth using a scanning electron microscope. In addition, curing times were also measured.ResultsThe shear bond strengths in all experimental groups were higher than the acceptable clinical shear bond strengths, regardless of the curing unit used. In both LED LCU groups, all ceramic bracket groups showed significantly higher shear bond strengths than did the metal bracket groups except the plasma emulation group which showed no significant difference. When comparing units within the same bracket type, no differences in shear bond strength were observed between the second- and third-generation unit groups. Additionally, no significant differences were observed among the groups for the ARI.ConclusionsThe bracket-bonding effects and ARIs of second- and third-generation LED LCUs showed few differences, and most were without statistical significance; however, the curing time was shorter for the second-generation unit.

show abstract

“…A dureza superficial é uma das propriedades físicas mais importantes dos materiais dentários e é definida como a resistência de um material a indentação ou penetração. 9 O teste de dureza é geralmente utilizado por ser um método simples e confiável para indicar, de forma indireta, o grau de conversão e resistência à penetração do material a ser investigado 4,9,17 . Substancialmente, materiais resinosos, quando expostos à fotopolimerização inadequada, consequentemente apresentarão menor grau de conversão, o que implicará em valores de dureza reduzidos.…”

Section: Discussionunclassified

“…Embora o advento dos cimentos duais tenha contribuído de forma significativa para os procedimentos adesivos das restaurações cerâmicas, as fontes de luz visível também têm sido investigadas quanto à sua eficiência na polimerização dos materiais à base de resina 3,[7][8][9] . Especificamente, para as fontes de luz visível, alguns fatores podem interferir na eficiência de polimerização dos materiais à base de resina, tais como: tipo de luz (LEDs, halógena e arco de plasma), comprimento de onda, tempo de emissão e intensidade da luz visível 4,7 .…”

Section: Introductionunclassified

“…Em condições clínicas específicas, a intensidade da luz visível pode ser alterada pela presença de barreiras físicas, como, por exemplo, restaurações cerâmicas 4 . Estudo recente tem demonstrado que restaurações de cerâmica, simuladas em laboratório, são capazes de interferir na passagem de luz e resultar em baixos valores de microdureza dos cimentos resinosos duais 9 . Esse fato está diretamente relacionado com o grau de translucidez/opacidade que o material cerâmico apresenta.…”

Section: Introductionunclassified

See 1 more Smart Citation

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

View full text Add to dashboard Cite

<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>

show abstract

Light curing through glass ceramics: effect of curing mode on micromechanical properties of dual-curing resin cements

Abstract: When light curing resin cements through thick glass ceramic restorations, clinicians should consider to prolong the light curing times even with LED curing units providing high irradiances.

Cited by 27 publications

References 20 publications

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Effect of High-Irradiance Light-Curing on Micromechanical Properties of Resin Cements

Comparison of the bonding strengths of second- and third-generation light-emitting diode light-curing units

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

Contact Info

Product

Resources

About