Intensity output and effectiveness of light curing units in dental offices

Omidi, Baharan-Ranjbar; Gosili, Armin; Jaber-Ansari, Mona; Mahdkhah, Ailin

doi:10.4317/jced.54756

Cited by 28 publications

(35 citation statements)

References 11 publications

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“…On the other hand, the distribution of QTH in the present study was minimal at 11.5%, which is again similar to the field study analysis in Switzerland, showing 32.9% QTH units, 35 and the study by Omidi et al. showing 35.8% QTH units 31 …”

Section: Discussionsupporting

confidence: 91%

“…This high distribution of LED units is in harmony with the field study analysis of Switzerland, which showed a 67.10% distribution for LED lights, 35 and the same trend was reported by a recent study by Omidi et al. in private dental practices, with a 64.2% prevalence of LED units 31 …”

Section: Discussionsupporting

confidence: 90%

“…reported 30% of LCUs having output intensities less than or equal to 200 mW/cm 2 , with both of these studies carried out in private dental practices. Moreover, a recent study by Omidi et al., in 2018 evaluated the LCUs in private dental practices in Qazvin, Iran, and reported that 93% of LED and 97% of QTH units had the desirable light intensity output, i.e., output equal or greater than 300 mW/cm 2 31 …”

Section: Discussionmentioning

confidence: 99%

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Types of polymerisation units and their intensity output in private dental clinics of twin cities in eastern province, KSA; a pilot study

Alquria

Gady

Khabeer

et al. 2019

Journal of Taibah University Medical Sciences

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Objectives Light-cured resin-based composites (RBCs) are the preferred option to restore teeth. Dental light-curing units (LCUs) should deliver adequate light energy to ensure good mechanical properties, dimensional stability, and biocompatibility of the RBC. The aim of this study was to determine the types of LCUs and their intensity output in private dental clinics. Methods A form was developed to record information related to the type of curing lights and their intensity output. A total of 400 curing devices were evaluated using a digital radiometer in 58 private dental clinics. For each device, three separate 10-s readings were taken and the average was calculated. For quartz tungsten halogen (QTH) units, a light intensity below 300 mW/cm 2 was considered unsatisfactory, whereas for light-emitting diode (LED) units, a reading below 600 mW/cm 2 was considered unsatisfactory. Results Out of 400 curing lights, 354 were LEDs and 46 were QTH units. A total of 13% of the lights were considered unsatisfactory. Of the LED units, 12.4% had a light intensity of less than 600 mW/cm 2 , whereas QTH had 17.3% units with an intensity of less than 300 mW/cm 2 . Conclusion The frequency of LCUs showed a trend towards LED units in private dental clinics, whereas the mean intensity value from the LED was higher than that from QTH units. Overall, the radiometer is a good tool to assess the intensity output of LCUs.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Types of polymerisation units and their intensity output in private dental clinics of twin cities in eastern province, KSA; a pilot study

Alquria

Gady

Khabeer

et al. 2019

Journal of Taibah University Medical Sciences

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“…The use of budget priced LCUs that have often been purchased over the Internet is becoming popular 16 . Many of these budget LCUs appear to be equivalent to higher cost LCUs from quality manufacturers because these budget lights often claim similar radiant exitance (irradiance) values.…”

Section: Describing the Light-curing Unitmentioning

confidence: 99%

The light-curing unit: An essential piece of dental equipment

Price

Ferracane

Hickel

et al. 2020

International Dental Journal

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Introduction: This article describes the features that should be considered when describing, purchasing and using a lightcuring unit (LCU). Methods: The International System of Units (S.I.) terms of radiant power or radiant flux (mW), spectral radiant power (mW/nm), radiant exitance or tip irradiance (mW/cm 2), and the irradiance received at the surface (also in mW/cm 2) are used to describe the output from LCU. The concept of using an irradiance beam profile to map the radiant exposure (J/cm 2) from the LCU is introduced. Results: Even small changes in the active tip diameter of the LCU will have a large effect on the radiant exitance. The emission spectra and the effects of distance on the irradiance delivered are not the same from all LCUs. The beam profile images show that using a single averaged irradiance value to describe the LCU can be very misleading. Some LCUs have 'hot spots' of high radiant exitance that far exceed the current ISO 10650 standard. Such inhomogeneity may cure the resin unevenly and may also be dangerous to soft tissues. Recommendations are made that will help the dentist when purchasing and then safely using the LCU. Conclusions: Dental manufacturers should report the radiant power from their LCU, the spectral radiant power, information about the compatibility of the emission spectrum from the LCU with the photoinitiators used, the active optical tip diameter, the radiant exitance, the effect of distance from the tip on the irradiance delivered, and the irradiance beam profile from the LCU.

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“…In the 80 s, studies had been conducted to assess the ocular hazards of quartz-tungsten halogen (QTH) LCUs and it was found that due to their low emission intensities of around 300 mW/cm 2 , they had little potential to cause ocular damage (Rueggebergf et al, 2017, Satromi et al, 1987, Al-Samadani et al, 2013). However, the plasma arc and LED curing units today have a very different spectra emission and emit irradiances of up to 3000 mW/cm 2 or more (Omidi et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Ocular hazards of curing light units used in dental practice – A systematic review

Alasiri

Algarni

Alasiri

2019

The Saudi Dental Journal

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ObjectiveTo examine the literature and summarize studies that describe the potential ocular hazards that are posed by different systems of light curing units mainly used in the dental clinics, to ensure the safety of the operator, patient and the auxiliary staff in the dental clinic.MethodsThis systematic review was reported and conducted according to the PRISMA guidelines. The online databases PubMed and Google Scholar were used for data search. MeSH terms were used for PubMed search. Randomized controlled clinical trials, original studies and in-vitro studies conducted up to 2018 in English language were included in the review. Eight articles were included in the study after application of eligibility criteria, all of which were in accordance to the review protocol.ResultsThe total wavelength dose received can cause Ocular damage which suggest that light intensity is correlated to the duration required to cause a certain level of damage, and we can substitute the long light exposure by using of a lower intensity light.ConclusionThis review concludes that blue light poses maximum risk to cause retinal degeneration based on the evaluated studies. Most of the studies recommend the use of protective eyewear in order to limit exposure of the patient, operator and assistant to the LCUs. It is not advisable to stare directly into the light source and the recommended safe exposure times and distances for patient, operator and assistant must be strictly adhered to in the dental practice.

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Intensity output and effectiveness of light curing units in dental offices

Cited by 28 publications

References 11 publications

Types of polymerisation units and their intensity output in private dental clinics of twin cities in eastern province, KSA; a pilot study

Types of polymerisation units and their intensity output in private dental clinics of twin cities in eastern province, KSA; a pilot study

The light-curing unit: An essential piece of dental equipment

Ocular hazards of curing light units used in dental practice – A systematic review

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