Light output from six battery operated dental curing lights

Shimokawa, Carlos Alberto Kenji; Turbino, Miriam Lacalle; Harlow, Jessie; Price, Hannah Louise; Price, Richard

doi:10.1016/j.msec.2016.07.033

Cited by 44 publications

(35 citation statements)

References 26 publications

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“…Thus, irradiance measured from more heterogeneous beams drops more drastically when the distance to the tip is increased. The LCU used in the present study presents a homogenous beam profile (14) which helps to explain the low values of irradiance lost due to increased distance from tip. Surprisingly, the reduction on irradiance reaching the composite had limited effect on material conversion at the surface, regardless of the shade.…”

Section: Discussionmentioning

confidence: 93%

“…Most light-curing units (LCU) available on the market deliver irradiances as high as 1,000 mw/cm 2 , with some examples going far beyond that, which has been shown to provide adequate levels of degree of conversion for the composite in most clinical situations (14). However, very often the access for the light guide is compromised to some extent, as is the case on the bottom of the proximal box of class II restorations from Black classification , especially when considering distal boxes in posterior teeth in the upper arch, for example.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

et al. 2017

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This study aimed to evaluate the effect of the composite shade and distance from the light-curing unit (LCU) tip on the irradiance reaching the bottom of composite disks and on the depth of polymerization. Composites of three shades (opaque -OXDC, bleach -BXL, and A2) were inserted into molds with 3-mm of thickness positioned over a spectrometer and photo-activated with the LCU (Bluephase) tip placed at 0 or 1 cm from the composite surface. The mean irradiance reaching the bottom of composite was recorded during the entire photo-activation (30 s). Specimens (2 x 2 x 4 mm) were polymerized and used to map the degree of conversion achieved in different depths from irradiated surface. Specimens were sectioned into slices that were positioned over the platform of the infrared microscope connected to the spectrometer to map the conversion. The conversion was measured in eight different depths every 500-µm. Increasing the distance of LCU tip reduced the irradiance only for A2. Interposing OXDC disks resulted in lowest values of irradiance and A2 the highest one. A tendency to decrease the conversion was observed towards the bottom of specimens for all experimental conditions, and the slope was more accentuated for OXDC. Differences among shades and distances from LCU tip were evident only beyond 1.5-2.0 mm of depth. In conclusion, both composite shade and distance from LCU tip might affect the light-transmission and depth of polymerization, while the effect of last was more pronounced.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

et al. 2017

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“…Given that dentists wish to reduce the time spent light curing, this value was considered to be the minimum irradiance necessary to adequately polymerize a 2 mm increment of composite (20,21). Six LCUs delivered inadequate irradiance in posterior region: KON-LUX, Altlux II, Biolux Standard, TL-01, Optilux 501, DX Turbo LED 1200.…”

Section: Characteristics Of Light Curing Units Used Inmentioning

confidence: 99%

“…The tested scenario in this study would be even worse if the irradiance had been measured at the gingival floor of a proximal box, where the effects of an increased distance and the tip inclination will further reduce the irradiance. Thus despite some advertising claims that the dentist need light cure a bulk-fill RBC only once, the clinician may still have to light cure a bulk-fill RBC restoration more than once so that all of the restoration receives sufficient light (20) Manufacturers and researchers should provide detailed information about the radiant power (mW), irradiance, the effect of distance on the irradiance, and the emission spectrum across the light tip when describing the LCU (2), so that the dentist can make an informed decision about the choice of LCU, the exposure time and photoactivation technique (20). Clinicians should periodically check their LCUs by measuring the irradiance and they should consider the effect of different shades and opacity of the RBC on the exposure time.…”

Section: Characteristics Of Light Curing Units Used Inmentioning

confidence: 99%

An Evaluation of the Light Output from 22 Contemporary Light Curing Units

et al. 2017

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This study measured the radiant power (mW), irradiance (mW/cm 2 ) and emission spectra (mW/cm 2 /nm) of 22 new, or almost new, light curing units (LCUs): -Alt Lux II, BioLux Standard, Bluephase G2, Curing Light XL 3000, Demetron LC, DX Turbo LED 1200, EC450, EC500, Emitter C, Emitter D, KON-LUX, LED 3M ESPE, Led Lux II, Optilight Color, Optilight Max, Optilux 501, Poly Wireless, Radii cal, Radii plus, TL-01, VALO Cordless. These LCUs were either monowave or multiple peak light emitting diode (LED) units or quartz-tungstenhalogen LCUs used in anterior and posterior teeth. The radiant power emitted by the LCUs was measured by a laboratory grade laser power meter. The tip area (cm²) of the LCUs was measured and used to calculate the irradiance from the measured radiant power source. The MARC-Patient Simulator (MARC-PS) with a laboratory grade spectrometer (USB4000, Ocean Optics) was used to measure the irradiance and emission spectrum from each LCU three times at the sensor located on the facial of the maxillary central incisors and then separately at the occlusal of a maxillary second molar. The minimum acceptable irradiance level was set as 500 mW/cm 2 . Irradiance data was analyzed using two-way ANOVA and the radiant power data was analyzed by one-way ANOVA followed by Tukey test (α=0.05). In general, the irradiance was reduced at the molar tooth for most LCUs. Only the Valo, Bluephase G2 and Radii Plus delivered an irradiance similar to the anterior and posterior sensors greater than 500 mW/cm 2 . KON-LUX, Altlux II, Biolux Standard, TL-01, Optilux 501, DX Turbo LED 1200 LCUs delivered lower irradiance values than the recommended one used in molar region, KON-LUX and Altlux II LCUs used at the maxillary incisors. Bluephase G2 and Optilight Max delivered the highest radiant power and KON-LUX, Altlux II and Biolux Standard delivered the lowest power. The emission spectrum from the various monowave LED LCUs varied greatly. The multi-peak LCUs delivered similar emission spectra to both sensors.

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“…Isso pode viabilizar a avaliação do perfil do feixe de luz de equipamentos que emitem luz pulsada. 6 Tendo essas diversas características a serem consideradas sobre os equipamentos fotoativadores, a avaliação de somente uma delas não é suficiente para sua avaliação. 7 Existe a necessidade da caracterização dos equipamentos como um todo, sendo que os fabricantes deveriam fornecer informações para garantir que os cirurgiões-dentistas, em meio a tantas opções disponíveis, tenham a possibilidade de escolher corretamente seus equipamentos, assim como para garantir que os pesquisadores possam atentar à reprodutibilidade de seus estudos.…”

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Influência de características de equipamentos fotoativadores e tempos de fotoativação na polimerização de resinas compostas bulk fill

Shimokawa¹

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Light output from six battery operated dental curing lights

Cited by 44 publications

References 26 publications

Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

Impact of Material Shade and Distance from Light Curing Unit Tip on the Depth of Polymerization of Composites

An Evaluation of the Light Output from 22 Contemporary Light Curing Units

Influência de características de equipamentos fotoativadores e tempos de fotoativação na polimerização de resinas compostas bulk fill

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