Stability of the Light Output, Oral Cavity Tip Accessibility in Posterior Region and Emission Spectrum of Light-Curing Units

André, Carolina Bosso; Nima, Gabriel; Sebold, Maicon; Giannini, Marcelo; Price, Richard

doi:10.2341/17-033-l

Cited by 29 publications

(20 citation statements)

References 29 publications

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“…Modern LED LCUs use 1-8 LEDs in an array which is flat [23], which makes bundling the light more difficult and may result in an inhomogeneous beam profile, despite being a mono-wavelength unit (peak at around 450-470 nm). Finally, the last step in development is the broad spectrum LED LCU, which uses different types of LEDs, emitting light with different wavelengths (violet light (380 -420 nm) and blue light (420 -495 nm) [8,20]. Therefore they are able to activate different types of photoinitiators [24].…”

Section: Original Articlementioning

confidence: 99%

“…Very large differences have been documented when comparing the light curing of untrained vs trained dentists [5]. Furthermore, the dentist should be aware that the irradiance of an LCU diminishes as the distance increases from the light output window [6] and, besides that, the cleanliness aspect of the LCU light tip is fundamental, because any residual RBC stuck onto the light exiting window may also reduce the light irradiance, which is a huge problem that affects the geometry of the light tip which may create shadows [7,8], and thus the depth of the cure may be reduced. Furthermore, depending on their composition (filler, resin mix, pigments and opacifiers), RBCs absorb more or less light [9], which reduces the depth of the cure as well.…”

Section: Introductionmentioning

confidence: 99%

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Beam Profile Characterization of a Dental Light Curing Unit Using a Spectrometer-Based Method

Roulet¹,

Rocha²,

Shen³

et al. 2018

EDUJ

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The study aimed to characterize a broad spectrum light curing unit (LCU) by measuring the light beam profile output of the LCU using a spectrometer-based method and correlate it with a standard camera-based beam profile method. Materials and Methods: A broad spectrum LED LCU (Ascent OL5, CAO Group) was mounted above a spectrometer (MARC® Resin Calibrator, BlueLight Analytics) at exposure distances of 1.0, 1.5 or 2.5 mm. The position of the center of the LCU was aligned with the spectrometer's cosine corrector sensor, and then moved in 1-mm increments in the x-y plane, while concomitantly recording the irradiance. The recorded irradiance was systematically organized and reported in function of the distance from the center of the LCU exiting window. Using a standard camera-based beam profiler, a beam profile of the LCU was obtained and the above approach was emulated to the beam profile. For both methods, the irradiance decreases related to the value measured at the center position was analyzed by calculating the slope, using a linear correlation. Results: Both methods showed that moving away from the center showed decreased irradiation. The beam profile of the LCU is asymmetric. The inhomogeneity of the beam was slightly lower with farther distance from the LCU's light exciting window. Conclusion: The spectrometer-based method was able to characterize the beam profile of the LCU and can be used in the evaluation of LCUs.

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Section: Original Articlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beam Profile Characterization of a Dental Light Curing Unit Using a Spectrometer-Based Method

Roulet¹,

Rocha²,

Shen³

et al. 2018

EDUJ

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show abstract

“…However, different clinical situations can make this difficult or almost impossible, such as the restauration location and the light tip angulation versus patient mouth aperture ( Fig. 7) [17,18].…”

Section: Positioningmentioning

confidence: 99%

Light curing matters: Facts often overseen by dentists

Oliveira¹,

Rocha²,

Roulet³

2018

EDUJ

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To make dentists aware on the importance of correctly used light cure resin composites. Method: Highlighting important facts about light curing: Use of high quality light curing unit, use of the resin composite specific appropriate radiant exposure to adequately cure a resin composite, and highlighting important facts that may alter the radiant exposure received clinically by a resin composite restoration. Results: Application of this knowledge should change the behavior of dentists when it comes to light curing. Conclusions: The facts described should help educational institutes and professors to reinforce proper light curing techniques and associate training sessions within educational courses in order to improve teaching and learning.

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“…A handheld radiometer is designed to measure exitance irradiance of LCUs and not the radiant exposure received by the restoration (18,19) nor the LCU radiant power emitted. However, a new handheld dental radiometer was developed to measure both irradiance and radiant power of LCUs: Bluephase II (Ivoclar Vivadent, Schaan, Liechtenstein) (20).…”

Section: Introductionmentioning

confidence: 99%

Accuracy of Irradiance and Power of Light-Curing Units Measured With Handheld or Laboratory Grade Radiometers

2019

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This study measured and compared exitance irradiance and power of 4 commercial dental light-curing units (LCU) (Elipar S10, Elipar DeepCure-S, Corded VALO and Bluephase Style) using different types of radiometers. The devices used to analyze the LCU were classified as either handheld analog (Henry Schein, Spring, Demetron 100A, Demetron 100B and Demetron 200), handheld digital (Bluephase 1, Bluephase II, Coltolux, CureRite and Hilux), or laboratory instruments (Thermopile and Integrating Sphere). The laboratory instruments and the Bluephase II radiometer were also used to measure the LCU’s power (mW). The LCU’s were activated for 20 s (n=5). Data were analyzed using Kruskal-Wallis and Student-Newman-Keuls multiple comparison test (a=0.05). Among the LCU, the laboratory instruments presented different irradiance values, except for Corded VALO. The Coltolux and Hilux radiometers measured greater irradiance values compared to the laboratory instruments for the four LCUs tested. Within a given LCU, handheld analog units measured lower irradiance values, compared to handheld digital and laboratory instruments, except using the Spring radiometer for the Elipar S10 LCU. None of the handheld radiometers were able to measure similar irradiance values compared to laboratory instruments, except for Elipar S10 when comparing Bluephase 1 and Thermopile. Regarding power measurement, Bluephase II always presented the lowest values compared to the laboratory instruments. These findings suggest that the handheld radiometers utilized by practitioners (analog or digital) exhibit a wide range of irradiance values and may show lower outcomes compared to laboratory based instruments.

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Stability of the Light Output, Oral Cavity Tip Accessibility in Posterior Region and Emission Spectrum of Light-Curing Units

Abstract: Not all of the blue-emitting lights deliver the same emission spectra, and some curing lights delivered a lower irradiance (as much as 8% lower) after the 25th exposure.

Cited by 29 publications

References 29 publications

Beam Profile Characterization of a Dental Light Curing Unit Using a Spectrometer-Based Method

Beam Profile Characterization of a Dental Light Curing Unit Using a Spectrometer-Based Method

Light curing matters: Facts often overseen by dentists

Accuracy of Irradiance and Power of Light-Curing Units Measured With Handheld or Laboratory Grade Radiometers

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