State of the intensity of the light power of the light-curing lamps of the faculty of dentistry clinic of the University of Cuenca, school year 2021-2022 (original) (raw)
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Journal of Health Sciences, 2021
Photoactivated composite resins are among the most widespread restorative materials in dentistry, particularly in cosmetic dentistry. To obtain the best properties of the material, the resins must have their polymerization reaction initiated by means of the light-curing device, which activates the photoinitiators present in the composites. For this process to occur in the desired way, it is essential that the light-curing device emits light at the intensity necessary to properly activate the photoinitiators. Thus, a pilot study was carried out to assess the light intensity emitted by the light-curing devices used in a school clinic. To assess the light intensity emitted by the devices, a radiometer was used. Twenty-four light-curing devices were evaluated, 13 Optilight Max devices, 8 Optilight LD MAX 440 devices, 3 Emitter C. devices. All the devices had an emitted light below 400 mW / cm² and 67% of the devices had intensity above 300 mW/cm². The average light emission values of th...
Light intensity of the light-curing units in private clinics in the city of Cuenca, Ecuador
World Journal of Advanced Research and Reviews, 2020
Introduction: Light intensity emitted by the curing lamps represents an essential factor in the activation of photosensitive materials. The adequate supply of intensity, as well as the correct functioning of the device, it ensures a correct dental treatment. Objective: To know the light intensity, type, and fiber state of the curing lamps used in private dental offices in the city of Cuenca - Ecuador. Materials and methods: The cross-sectional descriptive study assessed the light intensity of 366 light-curing lamps from private clinics with the use of a Bluephase Meter II radiometer, besides the Likert-scale based evaluation of its type and condition. Data analysis was done with the software R v.3.2 and its interface R-Studio v.1.2. Results: Inadequate light intensities were observed in 18% of the total analyzed units. Inadequate light intensities corresponded at 46% of Halogen lamps, and 12% of LED units. Likewise, 17% of units presented fiber fracture, while 52% showed residues of...
Analysis of Intensity in Different Light Cure Units Used in Dentistry
Al-Rafidain Dental Journal
Aims: The aim of this study was the analysis of intensity in different light cure units used in dentistry. Materials and Methods: Four types of light curing sources units; ULTRA-LITE (LED) Astralis 5 (Halogen), BlueLuxcer .TM (Halogen), Delma (LED), were evaluated for the analysis. Light intensity was recorded at various distances of 0-16 mm, between the light curing tip and a curing radiometer, and at different times (10, 20, 30 seconds) in low-power and at 5, 10, 20 seconds in high-power. Results: The highest light intensity for the first three types (562 mW/cm 2) was obtained by BlueLuxcer .TM high power when the tip of light curing unit was in contact with a curing radiometer. The light intensity for the three types of LCUs decreased significantly (p< 0.05) when the light tip was placed at an angle 70 0 and distance 0, 2, 4, 6, 8, 10, 12, 14, 16 mm away from the a curing radiometer, and the lowest intensity (38 mW/cm 2) was obtained by ULTRA-LITE-LED. But the maximum light intensity for the light cure type Delma-LED, was 772 mW/cm 2 and the minimum was 268 mW/cm 2 when the light tip was placed perpendicular 90 0 and distance 0, 2, 4, 6, 8, 10, 12, 14, 16 mm away from the a curing radiometer. Furthermore, no significant differences (p>0.05) were detected between Intensity and varying time at 5, 10, 20, 30 sec. Conclusions: The intensity of the curing light was strongly affected by the angles and distance. The decrease in light intensity was significant (p< 0.05) when the light tip placed at an angle 70° and a way to the aperture of the a curing radiometer, but the magnitude of the intensity it becomes more with the same procedure when the angle was perpendicular 90 0. The decrease in the light intensity of the light curing units, agree with the inverse square law for the distances 0 to 16 mm. The study found that there was no significant difference (p> 0.05) in light intensity between the light curing tip and a curing radiometer varying with time. This study notice that the intensity of the light cure type LED is less than QTH(Quartz Tungsten Halogen).
An Evaluation of the Light Output from 22 Contemporary Light Curing Units
Brazilian Dental Journal, 2017
This study measured the radiant power (mW), irradiance (mW/cm2) and emission spectra (mW/cm2/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-tungsten-halogen 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 th...
IP Innovative Publication Pvt. Ltd., 2017
Introduction: A clinical survey to evaluate functional efficacy of various light curing units in dental offices across Chhattisgarh state, India. Aims: The purpose of this study was to evaluate the output intensity & the factors affecting functional efficacy of various light curing units used in private dental office. Methods and Material: The output intensity of 110 light curing units in various dental clinics across Chhattisgarh state was examined with the help of Bluephase® radiometer. Various factors were also selected and recorded that can affect the functional efficacy of light cure units. The average output intensity was divided into two categories for QTH (<300mW/cm2 & >300mW/cm2) and for LED (<600mW/ cm2 & > 600 mW/cm2). Results: Among the QTH light cure units, 32 out of 41 (78%) were found out to be satisfactory while 44 LED light cure units out of 69 (63.7%) were satisfactory based on the criteria used for the study (p-value= 0.12). Conclusions: observation found that there is general lack of regular maintenance of these light curing units affects the functional efficacy of these units.
To Determine The Functional Efficacy of Led Units in Various Clinical Offices
Dental Journal of Advance Studies
Aim: Light units used for polymerization of resin composites are subject to deterioration with age, and frequent maintenance is required to maintain optimal efficacy. The aim of this study was to examine the efficacy of LED units in private dental offices in Baddi (H.P) for polymerization of resin composites. Materials and Methods: Twenty dental offices met all selection criteria and agreedto participate in the study. To measure light intensity, an analogue radiometer was used. The probe of each LED unit was placed and then measurements of light intensities were recorded for each light unit and the data was statistically analysed. Results: The light intensity of the individual units varied widely. The results revealed that there was error of 35% and a standard deviation of 155.76 among the intensities of various LED Units checked in the study. Conclusions: Light polymerization units in private dental offices displayed a wide rangein light intensity, and many had below-recommended le...
Evaluation of light-curing units in rural and urban areas
The Saudi dental journal, 2012
To evaluate the distribution of light-curing units (LCU) used in an urban area (Riyadh) and a rural area (Kharj) of Saudi Arabia, and to compare their irradiance values. The study involved three dental centers in urban areas and two in rural areas, all of which were parts of a single healthcare institution providing dental services. The light outputs (power mW) from 140 LCUs were measured by laboratory-grade spectrometry, and the irradiance (mW/cm(2)) was calculated from the tip area of each LCU. The minimum acceptable irradiance outputs for the quartz-tungsten-halogen (QTH) and light-emitting diode (LED) units were set at 300 and 600 mW/cm(2), respectively. The ages of these units and the protocol used to light-cure the resins were also determined. The total number of LCUs was 140, 112 (78%) in urban areas, and 28 (22%) in rural areas. In rural areas, only 7 of the 22 (32%) QTH units delivered irradiances greater than 300 mW/cm(2) and were therefore considered clinically acceptable...
Light Intensity of Curing Units in Dental Offices in Zagreb, Croatia
2011
Photopolymerization unit is an essential part of every dental office. The intensity of light curing units gradually decreases with time and can lead to poor polymerization, which cannot be detected clinically immediately after illumination. The purpose of this study was to examine whether the intensity of light curing units in dental offices in Zagreb satisfies minimum operational requirements. The light intensity of 111 curing units was measured using radiometer (Bluephase® meter, Ivoclar Vivadent, Schaan, Liechtenstein). Six measurements were taken for each unit, three at the beginning of illumination and the other three at 35-40 seconds from the beginning. Data were also collected about the type of curing unit, manufacturer, age, frequency of use and the existence of integrated radiometer. Light intensity lower than 300 mW/cm2 had 34% of curing units and 44% lower than 400 mW/cm2. The average light intensity of the remaining curing units was 675.3 mW/cm2. This study included phot...
Curing efficacy of light emitting diodes of dental curing units
Journal of dental research, dental clinics, dental prospects, 2009
The aim of the present study was to compare the efficacy of quartz tungsten halogen (QTH) and light emitting diode (LED) curing lights on polymerization of resin composite. A hybrid resin composite was used to prepare samples which were cured using two QTH and ten LED light curing sources. Twelve groups, each containing ten samples, were prepared using each light source. The cured depth of the resin was determined using ISO 4049 method and Vickers hardness values were determined at 1.0 mm intervals. Data was analyzed by ANOVA and Tukey test. Data analysis demonstrated a significant difference between light sources for depth of cure. At 1.0 mm below the surface all the tested light sources and at 2.0-mm intervals all light sources except two (Optilux 501 and LEDemetron I) and at 3.0-mm intervals only two light sources (PenCure and LEDemetron II) could produce hardness values higher than 80% of superficial layer values. This study showed that a variety of LED light sources used in the...
Irradiance Uniformity and Distribution from Dental Light Curing Units
Journal of Esthetic and Restorative Dentistry, 2010
Problem: The irradiance from dental light-curing units (LCUs) is commonly reported as a single number, but this number does not properly describe the light output. Purpose: This study examined the irradiance uniformity and distribution from a variety of LCUs as well as the effect of different light guides. Materials and Methods: Five LCUs representing quartz-tungsten-halogen, plasma arc, and light emitting diode units were evaluated. One LCU was evaluated using two different light guides (Standard or Turbo style). The total power emitted from each LCU was measured and the irradiance calculated using conventional methods (ICM). In addition, a beam profiler was used to determine the optically active emitting area, the mean irradiance (IBP), the irradiance distribution, and the Top Hat Factor (THF). Five replications were performed for each test and compared using analysis of variance with Fisher's PLSD tests at a pre-set alpha of 0.05. Results: The spatial distribution of the irradiance from LCUs was neither universally symmetrical nor was it uniformly distributed across the tip end. Significant differences in both the emitted power and THF were found among the LCUs. The THF values ranged from a high of 0.74 Ϯ 0.01 to a low of 0.32 Ϯ 0.01. Changing from a standard to a turbo light guide increased the irradiance, but significantly reduced beam homogeneity, reduced the total emitted power, and reduced the optical tip area by 60%. Conclusions: Using different light guides on the same LCU significantly affected the power output, irradiance values, and beam homogeneity. For all LCUs, irradiance values calculated using conventional methods (ICM) did not represent the irradiance distribution across the tip end of the LCU. CLINICAL SIGNIFICANCE Irradiance values calculated using conventional methods assume power uniformity within the beam and do not validly characterize the distribution of the irradiance delivered from dental light curing units.