Evaluation of Light Intensity Output of QTH and LED Curing Devices in Various Governmental Health Institutions

Shaafi, MM Al; Maawadh, AM; Qahtani, MQ Al

doi:10.2341/10-247-o

Cited by 45 publications

(41 citation statements)

References 27 publications

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“…A recent study has shown that many practitioners use halogen lights with power outputs ,300 mW/cm. 2,39 Thus, the polymer- ization efficiency achieved with high irradiance lights might be even more significant than was demonstrated in the present study.…”

Section: Discussionmentioning

confidence: 46%

Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Watanabe

Kazama

Asai³

et al. 2015

Operative Dentistry

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Regardless of the type of curing unit used, indirect irradiation of dual-cured resin cement through a ceramic plate resulted in decreased KHN values compared with direct irradiation. When the irradiation period was extended, only the LED units were able to achieve similar KHN values to those observed under direct irradiation in the presence of plates ≥2.0-mm thick. High-intensity LED units require a shorter irradiation period than halogen and second-generation LED curing units to obtain KHN values similar to those observed during direct irradiation.

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Section: Discussionmentioning

confidence: 46%

Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Watanabe

Kazama

Asai³

et al. 2015

Operative Dentistry

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“…It can be inferred that the same situation may exist in some research laboratories. Although some of these surveys used fiber-optic spectrometers to measure the output from the LCUs (Ernst et al 2006;Al Shaafi et al 2011), typically these surveys have been conducted with simple dental radiometers. While some dental radiometers may provide an accurate averaged radiant exitance value when used with an LCU from the same manufacturer, the reality is that the light output from LCUs can rarely be accurately measured and never completely described by a commercial dental radiometer (Leonard et al 1999;Aravamudhan et al 2006;Roberts et al 2006;Busemann et al 2008;Price et al 2012).…”

Section: Measuring Light Output: Radiant Power (W) and Radiant Exitanmentioning

confidence: 99%

Light-Curing Units

2015

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For improved interstudy reproducibility, reduced risk of premature failures, and ultimately better patient care, researchers and dentists need to know how to accurately characterize the electromagnetic radiation (light) they are delivering to the resins they are using. The output from a light-curing unit (LCU) is commonly characterized by its irradiance. If this value is measured at the light tip, it describes the radiant exitance from the surface of the light tip, and not the irradiance received by the specimen. The value quoted also reflects only an averaged value over the total measurement area and does not represent the irradiance that the resin specimen is receiving locally or at a different moment in time. Recent evidence has reported that the spectral emission and radiant exitance beam profiles from LCUs can be highly inhomogeneous. This can cause nonuniform temperature changes and uneven photopolymerization within the resin restoration. The spectral radiant power can be very different between different brands of LCUs, and the use of irradiance values derived from dental radiometers to describe the output from an LCU for research purposes is discouraged. Manufacturers should provide more information about the light output from the LCU and the absorption spectrum of their resin-based composite (RBC). Ideally, future assessments and research publications should include the following information about the curing light: 1) radiant power output throughout the exposure cycle and the spectral radiant power as a function of wavelength, 2) analysis of the light beam profile and spectral emission across the light beam, and 3) measurement and reporting of the light the RBC specimen received as well as the output measured at the light tip.

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“…38,39 To date, every study published that has evaluated light curing units (LCU) used in dental offices has shown that many are delivering an inadequate light output and are also poorly maintained. 40,41,42,43,44,45,46,47 In addition to being an averaged value that has been calculated from the power output divided by the tip area, the irradiance values stated by the manufacturers are usually measured only at the light tip. These values can give the dentist the impression they are using a "powerful" curing light, but significantly lower irradiance may be reaching the surface of the resin that is often at least 2 to 8 mm away from the light tip.…”

Section: Effect Of Light Tip To Resin Distancementioning

confidence: 99%

Light curing in dentistry and clinical implications: a literature review

et al. 2017

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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.

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Evaluation of Light Intensity Output of QTH and LED Curing Devices in Various Governmental Health Institutions

Abstract: Clinical Relevance Evaluating the intensity of a light curing unit regularly prior to the application of tooth-colored restorative materials is essential to assure the quality of restorative procedures.

Cited by 45 publications

References 27 publications

Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material

Light-Curing Units

Light curing in dentistry and clinical implications: a literature review

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