Effect of Distance on the Power Density from Two Light Guides

Price, Richard; Dérand, Tore; Sedarous, Mary; Andreou, Pantelis; Loney, Robert W.

doi:10.1111/j.1708-8240.2000.tb00241.x

Cited by 90 publications

(78 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus the irradiance received by the restoration can be very different than at the tip of the light 48 and some curing lights deliver only 25% or less of the irradiance measured at the tip at a distance of just 8 mm away from the tip. [49][50][51][52][53] Consequently, the dentist should know how clinically relevant distances will affect the irradiance delivered by their curing light to the restoration (Figure 35). This information is highly relevant at the gingival margin region that is at high-risk for recurrent caries .54 This region is the most difficult to reach with the curing light and is furthest away from the light source.…”

Section: Effect Of Light Tip To Resin Distancementioning

confidence: 99%

Light curing in dentistry and clinical implications: a literature review

et al. 2017

View full text Add to dashboard Cite

Contemporary dentistry literally cannot be performed without use of resin-based restorative materials. With the success of bonding resin materials to tooth structures, an even wider scope of clinical applications has arisen for these lines of products. Understanding of the basic events occurring in any dental polymerization mechanism, regardless of the mode of activating the process, will allow clinicians to both better appreciate the tremendous improvements that have been made over the years, and will also provide valuable information on differences among strategies manufacturers use to optimize product performance, as well as factors under the control of the clinician, whereby they can influence the longterm outcome of their restorative procedures.

show abstract

Section: Effect Of Light Tip To Resin Distancementioning

confidence: 99%

Light curing in dentistry and clinical implications: a literature review

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The distance between the light tip and the gingival floor of a typical Class II preparation is about 7 mm. 17,21,22 This distance could have a significant influence on the polymerization of the first resin composite increment. In such situations, increasing light-curing time has been recommended.…”

Section: Introductionmentioning

confidence: 99%

Curing Efficiency of Three Different Curing Modes at Different Distances for Four Composites

Zhu¹,

Platt²

2011

Operative Dentistry

View full text Add to dashboard Cite

Doubling the exposure time of a high-intensity light-emitting diode curing light with a turbo tip and autofocus capability does not predictably compensate for distance in deep cavities. SUMMARYThis study investigated the influence of the different curing distances with three polymerization modes in terms of the surface microhardness of four resin composites as a function of energy density. A hybrid resin composite and flowable composite from each of two manufacturers were evaluated. The specimens were polymerized with one of two light-curing units: 1) Mini LED AutoFocus (1500 mW/cm 2 ) with a fast curing mode, for which two polymerization regimens were used: a) one AutoFocus function cycle and b) two AutoFocus function cycles, and 2) LEDemetron I (950 mW/ cm 2 ) with a 20-second curing time. Polymerization was performed with the curing tip at a distance of 0 mm, 3.0 mm, 6.0 mm, and 9.0 mm from the top surface of the specimen, and the power density of each light source was measured with a spectrophotometer. All specimens were stored in distilled water in a light-proof container at 378C for 24 hours, and their top and bottom surface Knoop hardness numbers were determined. Microhardness data were submitted to two-way analysis of variance and multiple comparisons with a Tukey test. All statistical analyses were performed at a significance level of 0.05. Though the curing lights tested exhibited a decrease in power density with distance, the rate and extent of power density loss were not the same. The polymerization mode and curing tip distance had a significant effect on the composite microhardness. There was also a significant interaction among polymerization mode, curing tip distance, and microhardness. The curing ability of the three polymerization modes was ranked in terms of the hardness percent values: the LEDemetron I . two cycles of the Mini LED AutoFocus . one cycle of the Mini LED AutoFocus.

show abstract

“…Já para as ponteiras com dimensões maiores esse paralelismo não ocorre. A extremidade a ponteira torna-se mais ampla e as paredes divergentes aumentam a efetividade da irradiação [15] . Contudo, Vandewalle, Roberts e Rueggeberg [24] encontraram que tais ponteiras são tão efetivas na distribuição da luz quanto às ponteiras padrão.…”

Section: Fibra óPtica Polímerounclassified

Influência do tipo de ponteira condutora de luz na microdureza de uma resina composta

et al. 2010

View full text Add to dashboard Cite

O objetivo desta pesquisa foi avaliar a influência do tipo de ponteira condutora de luz na microdureza de uma resina composta micro-híbrida. Foram confeccionados 14 corpos de prova da resina composta Opallis (FGM) com dimensões: 5 x 2 mm, divididos em dois grupos de acordo com a ponteira condutora de luz do aparelho fotoativador de lâmpada halógena Optilight Plus - GNATUS/300 mW.cm-2. GI - ponteira condutora de luz de fibra óptica; GII - ponteira condutora de luz de polímero. Após 24 horas, as medidas de microdureza foram efetuadas com um microdurômetro HMV 2000 (Shimadzu Japão). Cinco penetrações foram efetuadas em cada superfície (topo e base) totalizando 10 penetrações para cada corpo de prova. A análise estatística dos resultados realizada por meio do teste de ANOVA não apresentou diferenças significativas entre os tipos de ponta condutora de luz nas superfícies avaliadas. A análise estatística demonstrou diferença significativa nos valores médios de microdureza superficial entre as superfícies de topo e de base, para ambas as ponteiras. Com base nos resultados obtidos, foi possível concluir que as ponteiras de luz não interferem na microdureza da resina composta, e que ambas apresentaram diferenças estatisticamente significativas nos valores de microdureza das superfícies topo e base.

show abstract

Effect of Distance on the Power Density from Two Light Guides

Cited by 90 publications

References 18 publications

Light curing in dentistry and clinical implications: a literature review

Light curing in dentistry and clinical implications: a literature review

Curing Efficiency of Three Different Curing Modes at Different Distances for Four Composites

Influência do tipo de ponteira condutora de luz na microdureza de uma resina composta

Contact Info

Product

Resources

About