Evaluating Intensity Output of Curing Lights in Private Dental Offices

Barghi, Nasser; Berry, T. G.; Hatton, Carolyn

doi:10.14219/jada.archive.1994.0204

Cited by 109 publications

(106 citation statements)

References 13 publications

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“…There are numerous factors that can affect the efficiency of light curing units that include the age of the curing light, the condition of the bulb and filter, the contamination of the light guide and autoclave-induced damage to the fibre-optic bundle. 12,13 The results of this study suggest that disposable infection control barriers can have a significant reduction on power output of LCUs and LCTs. However, this is dependent on the LCU, disposable barrier and physical damage to the tip.…”

Section: Discussionmentioning

confidence: 77%

The effect of disposable infection control barriers and physical damage on the power output of light curing units and light curing tips

et al. 2011

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Section: Discussionmentioning

confidence: 77%

The effect of disposable infection control barriers and physical damage on the power output of light curing units and light curing tips

et al. 2011

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“…The result is a reduction of the LCU's effectiveness to cure dental composites. 4 The clinical implication of this for the dentist is a negative effect on the physical properties of composites with an increased risk of premature failure of restorations. Martin et al 5 and others 4,6 have shown that many halogen LCUs used by dental practitioners do not produce their optimum power output.…”

Section: Researchmentioning

confidence: 99%

“…4 The clinical implication of this for the dentist is a negative effect on the physical properties of composites with an increased risk of premature failure of restorations. Martin et al 5 and others 4,6 have shown that many halogen LCUs used by dental practitioners do not produce their optimum power output. A reduced output of LCUs is due to a lack of maintenance, such as changing the filter and/or the halogen bulb from time to time, and checking the LCU's irradiance.…”

Section: Researchmentioning

confidence: 99%

Dental composite depth of cure with halogen and blue light emitting diode technology

1999

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Objectives To test the hypothesis that a blue light emitting diode (LED) light curing unit (LCU) can produce an equal dental composite depth of cure to a halogen LCU adjusted to give an irradiance of 300 mWcm–2 and to characterise the LCU's light outputs. Materials and methods Depth of cure for three popular composites was determined using a penetrometer. The Student's t test was used to analyse the depth of cure results. A power meter and a spectrometer measured the light output. Results The spectral distribution of the LCUs differed strongly. The irradiance for the LED and halogen LCUs were 290 mWcm–2 and 455 mWcm–2, when calculated from the scientific power meter measurements. The LED LCU cured all three dental composites to a significantly greater (P < 0.05) depth than the halogen LCU. Conclusions An LED LCU with an irradiance 64% of a halogen LCU achieved a significantly greater depth of cure. The LCU's spectral distribution of emitted light should be considered in addition to irradiance as a performance indicator. LED LCUs may have a potential for use in dental practice because their performance does not significantly reduce with time as do conventional halogen LCUs

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“…Pesquisa prévia constatou diversas falhas nos aparelhos fotopolimerizadores que podem interferir na qualidade da polimerização 3 . Alguns aparelhos novos de luz halógena não se apresentam adequados para o uso e dos antigos poucos apresentam uma relação favorável entre irradiação de calor e intensidade de luz 2,9 . Os aparelhos de LED foram introduzidos com o intuito de suprir as debilidades dos aparelhos de luz halógena e podem ter um grande potencial para o uso odontológico, pois a sua performance não reduz significativamente com o tempo como ocorre com os aparelhos de luz halógena 17 .…”

Section: Discussionunclassified

Influência da Fotopolimerização e da Cor da Resina Composta na Microdureza

FIROOZMAND¹

2009

Pesq Bras Odontoped Clin Integr

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Objetivo: Verificar a influência da opacidade de cor e tipos de aparelhos fotopolimerizadores (luz halogena X led azul) na microdureza da resina composta. Método: A resina composta Esthet-X (Dentsply), nas cores A2 e A2-O, foi inserida em uma matriz de aço-inoxidável com cavidades de 5mm de diâmetro e 2mm de profundidade e fotopolimerizadas por aparelhos; de luz halógena, XL 3000 (3M) ou de LED azul, Optilight LD II (Gnatus), por 40s. Formaram-se 8 grupos com quinze amostras cada, sendo estes divididos conforme; as fontes polimerizadoras utilizadas, a área de exposição (superfície e a base) e a opacidade da resina composta empregada, perfazendo um total de 120 amostras de estudo. Estas foram armazenadas em água destilada, por 24h e embutidas em resina acrílica ativada quimicamente (RAAQ), sendo posteriormente realizados o acabamento e polimento com discos de lixa e de feltro. Realizou-se a leitura da microdureza em Microdurômetro Digital Vickers, utilizando 50g de carga por 30s de permanência. As médias das amostras foram submetidas aos testes estatísticos de análise de variância (ANOVA) e ao teste de comparação múltipla de Tukey (5%). Resultados: A microdureza da superfície foi sempre maior que a da base independente do aparelho polimerizador utilizado; o aparelho de luz halógena apresentou maiores valores médios de microdureza da resina composta (57,61HV) em relação ao aparelho de LED (42,53HV); foram encontradas diferenças significantes entre os valores médios de microdureza ao se variar a opacidade, sendo que em profundidade obteve-se os menores valores com a resina A2-O. Conclusão: A opacidade da resina, bem como, o aparelho fotopolimerizador influenciam no grau de microdureza da resina composta.Resinas compostas; Dureza; Aparelho fotopolimerizador. Objective:To study the influence of color opacity and light-curing systems (halogen light vs blue LED) on the microhardness of a composite resin. Methods: Esthet-X composite resin (Dentsply), shades A2 and A2-O, was inserted in a stainless steel matrix (5 mm diameter and 2 mm deep) and was light cured for 40 seconds with a halogen light source (XL 3000; 3M/ESPE) or a blue LED (Optilight LD II; Gnatus). Eight groups of 15 specimens each were formed, and were further divided according to the light-curing systems, the exposed area (base and surface), and the opacity of the composite resin, producing 120 specimens. The specimens were next stored in distilled water for 24 hours, embedded in a chemically activated acrylic resin, then subjected to finishing and polishing with sandpaper and felt discs. Microhardness was measured with a Vickers Digital Microhardness meter, with a 50 g load for 30 seconds. The obtained microhardness means were analyzed by ANOVA and Tukey's multiple-comparison test at 5% significance level. Results: The surface microhardness was always greater than the base microhardness, regardless of the light-curing source. The halogen light lamp produced significantly higher composite resin microhardness means than the blue LED (57.61 vs. 42.53 HV) (p<...

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Evaluating Intensity Output of Curing Lights in Private Dental Offices

Cited by 109 publications

References 13 publications

The effect of disposable infection control barriers and physical damage on the power output of light curing units and light curing tips

The effect of disposable infection control barriers and physical damage on the power output of light curing units and light curing tips

Dental composite depth of cure with halogen and blue light emitting diode technology

Influência da Fotopolimerização e da Cor da Resina Composta na Microdureza

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