Depth of cure and compressive strength of dental composites cured with blue light emitting diodes (LEDs)

Jandt, Klaus D.; Mills, Robin W.; Blackwell, Gordon B.; Ashworth, Stephen H.

doi:10.1016/s0109-5641(99)00083-4

Cited by 245 publications

(267 citation statements)

References 16 publications

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“…Some mechanical and physical properties of resin composites light-cured by LED have been reported, such as compressive and flexural strength, hardness, degree of conversion and depth of cure. Although LED polymerization technology tends to reach the performance level of halogen LCUs (3)(4)(5)(6), additional studies are needed to determine the degree of conversion of dental resin-based materials (7,8).…”

Section: Introductionmentioning

confidence: 99%

Degree of conversion of adhesive systems light-cured by LED and halogen light

Arrais

Pontes²,

Santos³

et al. 2007

Braz. Dent. J.

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This study evaluated the effect of blue light emitting diode (LED) and quartz tungsten halogen (QTH) on the degree of conversion (DC) of an etch-and-rinse Single Bond adhesive system (SB) and a mixture composed of primer solution and resin bond from Clearfil SE Bond self-etching adhesive system (CB) using Fourier transform infrared analysis (FTIR). Adhesives were applied to potassium bromide pellet surfaces and FTIR analyses were performed before and after photo-activation for 10 s with either LED (Freelight 1 -400 mw/ cm 2 ) or QTH (XL 3000 -630 mw/cm 2 ) light-curing units (n=8). Additional FTIR spectra were obtained from photo-activated samples stored in distilled water for 1 week. The DC was calculated by comparing the spectra obtained from adhesive resins before and after photo-activation. The results were analyzed by two-way split-plot ANOVA and Tukey's test (p<0.05). Both adhesive systems exhibited low DC (%) immediately after photo-activation (SB/QTH: 18.7 ± 3.9; SB/LED: 13.5 ± 3.3; CF/QTH: 13.6 ± 1.9; CF/LED: 6.1 ± 1.0). The DC of samples light-cured with LED was lower than DC of those light-cured with QTH, immediately after light curing and after 1 week (SB/QTH: 51.3 ± 6.6; SB/LED: 50.3 ± 4.8; CF/QTH: 56.5 ± 2.9; CF/LED: 49.2 ± 4.9). The LED curing unit used to photo-activate the adhesive resins promoted lower DC than the QTH curing unit both immediately after light curing and 1 week after storage in water.

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Section: Introductionmentioning

confidence: 99%

Degree of conversion of adhesive systems light-cured by LED and halogen light

Arrais

Pontes²,

Santos³

et al. 2007

Braz. Dent. J.

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“…This result was probably due to high light transmission through the ZR adherend. It was reported that the polymerization efficiency of dual-cure resins was affected by numerous factors: irradiation duration 24) , light intensity 25) , light transmission 26,27) , and ceramic shade 26) and thickness 28,29) . Specifically, a translucent ceramic which allowed more light to transmit through the material, as compared to an opaque ceramic, resulted in improved mechanical properties of dual-cure resin cement placed under the restorative material 30) .…”

Section: Vickers Hardness Of Resin Cement Placed Under Zr Restorationmentioning

confidence: 99%

“…Nonetheless, the high light intensity of the light curing unit (900 mW/cm 2 ) 25) , coupled with the high light transmission property of ZR 27) , enabled the polymerization of dual-cure resin cement placed under the ZR restoration.…”

Section: Vickers Hardness Of Resin Cement Placed Under Zr Restorationmentioning

confidence: 99%

Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

et al. 2013

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This study evaluated, by measuring Vickers hardness (Hv), the effects of these factors on the degree of polymerization of dual-cure cement (Panavia F2.0) placed under a restoration: light transmission property of restoratives materials, distance from the directly irradiated surface, and elapsed time after light irradiation. Two materials were used for the restoration: silver-palladium-copper-gold alloy (Alloy) versus zirconia (ZR). Restorations were cemented on bovine enamel by dual-cure cement. At 30 min, 2 h, 6 h, 1 day, and 1 week after definitive irradiation, Hv values at the enamel side of cement were evaluated at three measuring points: two points at the left and right margins and one point at the center. Data were analyzed by two-way ANOVA with Bonferroni correction (α=0.05). With the Alloy restoration, Hv value at the center was significantly lower than those at the margins at 30 min after irradiation. For both Alloy and ZR restorations, Hv value at each measuring point continued to increase significantly up to 6 h.

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“…É de suma importância uma polimerização de qualidade para obter-se o máximo de resistência para cada material 3 . Por esses motivos, novos estudos procuram encontrar a proporção adequada de densidade de potência necessária para uma eficiente conversão dos monômeros resinosos em polímeros, que trará como consequência a melhoria de suas propriedades físicas e químicas 4 .…”

Section: Introductionunclassified

Avaliação do grau de conversão de resinas compostas fotoativadas em diferentes tempos e potências

Lima¹,

Souza²,

Amorim³

et al. 2016

Rev. da Fac. de Odontologia, UPF

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Introdução: uma polimerização adequada é crucial para a obtenção das propriedades físicas ideais e o desempenho clínico das resinas compostas. Objetivo: avaliar o grau de conversão (GC) e dureza de resinas IntroduçãoDesenvolvidas por Bowen durante a década de 1960, as resinas compostas à base de BisGMA passaram por transformações com o intuito de melhorar suas propriedades mecânicas e estéticas 1 . Concomitantemente à evolução desses materiais, os pacientes buscam cada vez mais a excelência estética ao sorrir, o que leva ao desenvolvimento de resinas que, além de devolver a forma e função do dente, favoreçam a harmonia do sorriso de maneira natural. Sendo assim, por proporcionar ao profissional a capacidade de restabelecer a estética do sorriso, confeccionar restaurações em dentes posteriores, além do seu baixo custo, quando comparadas

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Depth of cure and compressive strength of dental composites cured with blue light emitting diodes (LEDs)

Cited by 245 publications

References 16 publications

Degree of conversion of adhesive systems light-cured by LED and halogen light

Degree of conversion of adhesive systems light-cured by LED and halogen light

Influence of light irradiation on Vickers hardness of dual-cure cement polymerized under restorations

Avaliação do grau de conversão de resinas compostas fotoativadas em diferentes tempos e potências

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