Polymerization Efficiency of LED Curing Lights

Leonard, Daniel L.; Charlton, David; Roberts, Howard W.; Cohen, Mark E.

doi:10.1111/j.1708-8240.2002.tb00524.x

Cited by 112 publications

(119 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…9 Despite having different levels of irradiance than halogen lamps (QTH), light-emitting diodes (LEDs) present irradiance concentrated around 470 nm, coincident with the absorption peak of camphorquinone. 8,10 In some situations, this characteristic favors the improved DC of dental adhesives. 11 However, the influence of different irradiances on the DC of composite resins is questionable.…”

Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of different shades and LED irradiance on the degree of conversion of composite resins

et al. 2012

View full text Add to dashboard Cite

The aim of this study was to evaluate the degree of conversion (DC) of two composite resins with different shades that were light cured by light-emitting diodes (LEDs) of different irradiances. Specimens (5 mm × 2 mm) were prepared with a nanofilled (Filtek Supreme -A2E, A2D, and WE) or microhybrid resin (Opallis -A2E, A2D, and EBleach Low) and were randomly divided into 12 groups (n = 5 each) according to the composite resin and light-curing unit (Elipar FreeLight 2, 1250 mW/ cm²; Ultralume 5, 850 mW/cm²). After 24 h, the DC was measured on two surfaces (top and bottom) with Fourier Transform infrared spectroscopy (FTIR). Data were statistically analyzed with two-way ANOVA and Tukey test (α = 0.05). Statistical differences among the surfaces were observed in all experimental conditions, with higher values on the top surface. The microhybrid resin presented the highest DCs for shades A2E and A2D on the top surface. The LED with higher irradiance promoted better DCs. Taken together, the data indicate that the shade of a composite resin and the irradiance of the light source affect the monomeric conversion of the restorative material.

show abstract

Section: Declaration Of Interestsmentioning

confidence: 99%

Influence of different shades and LED irradiance on the degree of conversion of composite resins

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The composite resin polymerization depth of a curing unit with 27 LEDs set at 350 mW/cm 2 was 20% smaller than that of halogen light 12 . Exposure time needed by LEDs for an adequate composite resin polymerization was longer than that required by halogen light 14 . The composite resin mechanical properties obtained after polymerization with LEDs set at 300 mW/ cm 2 were inferior or similar to those obtained with halogen light, however the LED results fulfilled the requirements set by the International Standards Organization (ISO) 1 .…”

Section: Discussionmentioning

confidence: 98%

“…Some studies have related a worse performance of LEDs when compared to that of halogen light 1,12,14 . Therefore there is the necessity of more studies to evaluate LEDs' performance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED

Carvalho

Turbino

2005

Braz. oral res.

View full text Add to dashboard Cite

ABSTRACT:With the development of composite resin polymerization techniques, LEDs were introduced to the market place. Based on the studied literature, the aim of this study was to evaluate, through microtensile testing, the bond strength to enamel of a composite resin associated to a conventional (multi-bottle) adhesive system or to a self etching primer adhesive system, polymerized by halogen light or LED (light emitting diode). Bovine teeth were divided into 4 groups with 10 teeth each (n = 10). Then the adhesives Scotchbond Multipurpose Plus (3M-ESPE) and Clearfil SE Bond (Kuraray) were applied following the manufacturers' instructions. Both systems were polymerized for 10 s by halogen light (Degulux Soft Start -Degussa Hulls) set at 550 mW/cm 2 or by LED (Kerr Demetron) set at 600 mW/cm 2 . The composite resin Filtek Z-250 was applied in four 1 mm increments with the aid of a square, condensation silicon, 5 mm x 5 mm matrix, and polymerized by either of light sources for 40 s. Scotchbond Multipurpose Plus polymerized by halogen light presented the highest bond strength values (39.69 ± 7.07 MPa), and the other groups did not present statistically significant differences: Scotchbond Multipurpose Plus polymerized by LED (22.28 ± 2.63 MPa), Clearfil SE Bond polymerized by halogen light (27.82 ± 2.65 MPa) and by LED (22.89 ± 5.09 MPa). DESCRIPTORS: Adhesives; Dental bonding; Polymerization; Light-emitting diode (LED). RESUMO:Com a grande busca pelo desenvolvimento das técnicas de polimerização das resinas compostas e dos sistemas adesivos, foram introduzidos no mercado os LEDs. Com base na literatura estudada, neste trabalho é avaliada a força de união da resina composta ao esmalte associado a um sistema adesivo convencional e a um sistema autocondicionante polimerizados por luz halógena e LED, por meio do teste de microtração. Os dentes bovinos foram divididos em 4 grupos com 10 dentes em cada um (n = 10), para aplicação do adesivo Scotchbond Multipurpose Plus (3M-ESPE) e do Clearfil SE Bond (Kuraray) conforme orientação do fabricante, ambos polimerizados por 10 s tanto pela luz halógena (Degulux Soft Start -Degussa Hulls) com potência de 550 mW/cm 2 como pelo LED (Kerr Demetron) com potência de 600 mW/cm 2 . A resina composta Filtek Z-250 foi aplicada em 4 incrementos de 1 mm com auxílio de uma matriz de silicona de condensação de formato quadrado com dimensões de 5 mm x 5 mm; sendo polimerizada tanto pela luz halógena como pelo LED por 40 s. O adesivo Scotchbond Multipurpose Plus polimerizado com luz halógena apresentou os maiores valores de adesão (39,69 ± 7,07 MPa) e os outros grupos não apresentaram diferença estatisticamente significante entre si: Scotchbond Multipurpose Plus polimerizado por LED (22,28 ± 2,63 MPa), Clearfil SE Bond polimerizado por luz halógena (27,82 ± 2,65 MPa) e por LED (22,89 ± 5,09 MPa).

show abstract

“…[12][13][14] Since that time, the search for more effective LEDs has produced the second-generation LED curing lights that provide higher light output. 15 Unlike first generation LEDs, heat generation can be an issue, and cooling fans, along with heat-sink features, were incorporated into the units to increase the life of the LEDs.…”

Section: Introductionmentioning

confidence: 99%

Should My New Curing Light Be An LED?

Antonson¹,

Antonson²,

Hardigan³

2008

Operative Dentistry

View full text Add to dashboard Cite

INTRODUCTIONA major factor in the success and predictability of resin composite restorations is the degree of resin polymerization achieved during restoration placement. The polymerization of resin composites depends on many intrinsic conditions, such as the type of the photo initiator, composition of the filler particles, shade and degree of translucency of the material. Additionally, the combination of the curing light unit's effective spectral output, wavelength and exposure duration is required for adequate polymerization. 1-2 The physical properties of restorations will be compromised if all of these parameters are not met, and early failure may be SA Antonson • DE Antonson • PC Hardigan Clinical RelevanceThis study provides information concerning curing light unit purchase decision criteria and supporting evidence to compare various curing light units that are on the market.

show abstract

Polymerization Efficiency of LED Curing Lights

Abstract: The first-generation LED-based curing lights in this study required considerably longer exposure durations than the QTH curing light to adequately polymerize a hybrid and a microfill resin composite.

Cited by 112 publications

References 19 publications

Influence of different shades and LED irradiance on the degree of conversion of composite resins

Influence of different shades and LED irradiance on the degree of conversion of composite resins

Analysis of the microtensile bond strength to enamel of two adhesive systems polymerized by halogen light or LED

Should My New Curing Light Be An LED?

Contact Info

Product

Resources

About