Protective Glasses Research Articles

ANALISIS RESIKO BAHAYA LIMBAH B3 MENGGUNAKAN METODE HIRARC PADA INSTALASI PEMBUANGAN AIR LIMBAH

Balai PIALAM, namely the Technical Implementation Unit (UPT) of the PUP-ESDM Office of the DIY Regional Government, is a centralized wastewater treatment plant. The problems that exist in Balai PIALAM are temporary storage of B3 waste does not meet the criteria, leaking storage, excessive capacity, methods that can be used to overcome B3 waste are using the HIRARC method, based on 9 activities of the B3 waste management process. Impact of hazard risk with research results Risk level: Medium 4 hazard effect 6.33%, High2 hazard effect 2.11%, extreme1 hazard effect 1.6%. The stages of making HIRARC are: decomposing the work into steps from the beginning to the end of the process, identifying the source of danger, determining the hazard posed by means of interviews, observations, observations, brainstorming, determining the impact on environmental workers, assessing the likelihood of occurrence is used to determine risk rating. Testing period January 2024, t BOD Input (min 99 mg/L,max 458 mg/L), Output (min 10 mg/L,max 59 mg/L), Average (input 206 mg/L, output 30 mg/L), testing period February 2024, testing t BOD Input (min 84 mg/L, max 288 mg/L), Output (min 12 mg/L, max 43 mg/L), Average (input 154 mg/L, output 24 mg/L). Use of APD such as laboratory coats, masks, special gloves, safety shoes, protective helmets and life vests, face shields. As well as implementing SOP. Control of hazards or risks both in laboratory and operational testing activities using APD: gloves, laboratory coats, safety shoes, protective glasses, masks, life vests, and special vests according to the work done and affirmation of SOP.

In Vitro Testing of Protective Eye Wear in Blocking Blue Light from Dental Light Curing Unit

Aim: To evaluate the ef?cacy of wearing protective eyewear in preventing harmful Dental light-curing units (LCUs). Background: Dental light-curing units generate blue light, capable of inducing soft-tissue burns and ocular harm like retinal damage. The intensity of blue light emitted by dental Light Curing Units is substantially higher, thereby potentially constituting a significant "blue light hazard." Material and Methods: To study the effect of protective glasses, reverse methodology was followed as the effect of blue light on the eye is difficult to measure; Circular composite disc samples were grouped into two, one of which was polymerized directly while the other had protective glass in between, Fourier transform infrared spectroscopy (FTIR) analysis was done and the degree of conversion was calculated. Results: Data obtained were analysed using One Way ANOVA. The mean values for "Degree of Conversion" in Group I (Without Protective Glass) is 1.334 +512 and for Group II (with protective glass) is -2.623 + 1.544 .One Way ANOVA revealed statistically significant difference between Group I and Group II (p=0.000) Conclusion: Within the limitations of this in vitro study, it can be concluded that the protective glasses are successful in filtering the harmful blue light emitted by LCU and should be used in day-to-day practice to improve the amount of light they deliver to the restoration from the LCU and prevent any harm to the ocular tissues. Clinical implications: Blue light filtering glasses in a dental operatory provide optimum protection, and the operator can safely watch and improve the amount of light delivered to the restoration from the LCU.

Investigation of the Properties of Unsaturated Allyl Alcohol and its Oxidation Reaction Products

Abstract Organic substances in which the -OH group is directly attached to the carbon atom are called alcohols. Unsaturated alcohols are obtained by replacing the hydrogen of ethylene or acetylene-type compounds with a hydroxyl group. Allyl alcohol, the first representative of the class of unsaturated alcohols, contains oxygen. Allyl alcohol is used in optical resins, protective glasses, paints and coatings and polymer cross-linking agents, as well as in the production of pharmaceuticals, organic chemicals, plastics, herbicides, and pesticides. In organic chemistry, alcohols can be oxidized to aldehydes, ketones, carboxylic acids, and esters that carry a higher oxidation state of carbon. Therefore, the selective oxidation of alcohols is an important issue. The properties and selective oxidation reaction of allyl alcohol were investigated in the presented work.

Rapid calibration plan for NIF's Near Backscatter Imager (NBI).

A rapid calibration system is under development for the Near Backscatter Imager (NBI) in use at the National Ignition Facility (NIF). NBI is an optical diagnostic that quantifies the stimulated Brillouin and Raman backscatter produced by NIF's targets. Specifically, NBI measures the light that does not fall directly back into the laser aperture, which is measured by the Full Aperture Backscatter System (FABS). When working in tandem with FABS, NBI allows for the full characterization of backscattered light. This informs Hohlraum laser coupling, optical damage, and laser-plasma interaction models. NBI uses a large Spectralon plate covered by a protective glass layer and is mounted inside the target chamber where it is exposed to high energy backscatter, neutrons, and build-up debris left over from the exploded targets. This gradually alters the reflectivity of the plate, meaning that NBI needs to be calibrated regularly. Described here is NIF's design for a system capable of rapid in situ calibration of NBI that is to be installed in FY25.

Low-cost, mobile EEG hardware for SSVEP applications

The global shortage of integrated circuits due to the COVID-19 pandemic has made it challenging to build biopotential acquisition devices like electroencephalography (EEG) hardware. To address this issue, a new hardware system using common ICs has been designed, which is cost-effective, precise, and easily accessible from global distributors. The hardware system comprises 8-channel inputs EEG hardware with a mobile headset capable of acquiring 5-30Hz EEG signals. First two channels of the design is enabled for steady-state visual evoked potential (SSVEP) operations, and the remaining channels can be powered up as needed. A small 3D-printable enclosure is also designed for the hardware board, which is attached to protective glasses to be used as a head-mounted device. The board includes an additional green LED, 4 pulse width modulation (PWM) outputs for general-purpose input/output (GPIO), 2 buttons for input, and exposed programming pins and digital-to-analog converter (DAC) output from the microcontroller unit (MCU). The proposed hardware system is expected to enable students and young researchers to experiment with EEG signals, especially SSVEP, before investing in professional equipment with the availability of programming codes.

A new protective glass material against gamma ray: Thorough analysis to determine the impact of adding gadolinium (III) oxide

This work presents a study of the effect of replacing lead dioxide and gadolinium (III) oxide with boron trioxide on the physical, mechanical, and radiation shielding properties for the B2O3-Na2O-ZnO-PbO2-Gd2O3 glass systems. The Archimedes method confirms that the increase in the PbO2+Gd2O3 concentration within the fabricated glass system in the range from 16 to 22 mol.% increases the fabricated glass samples' density from 4.052 to 4.408 g/cm3. Additionally, the Makishima-Mackenzie model was utilized to investigate the influence of PbO2+Gd2O3 on the mechanical properties of the investigated glass samples. The increase in the substituting of PbO2+Gd2O3 decreases the fabricated glass samples' mechanical properties and micro-hardness. Furthermore, the Monte Carlo simulation method was applied for the estimation of the impact of PbO2+Gd2O3 concentration on the fabricated samples' radiation shielding parameters. The increase in the concentration of PbO2+Gd2O3 with range of (16, 18, 20 and 22) leads to increase the linear attenuation coefficient (LAC) to 8.014–11.517 cm−1 at 0.06 MeV, 0.381–0.423 cm−1 at 0.6 MeV, 0.133–0.149 cm−1 at 5 MeV, and 0.132–0.154 cm−1 at 15 MeV with the same order, respectively. Therefore, the introduction of PbO2+Gd2O3 concentration enhances the fabricated glass samples' radiation shielding properties to be suitable for γ-ray shielding applications.

Preparation, mechanical properties and anti-oxidation behavior of lightweight porosity-controlled SiC(rGO, xZrB2) composite PDCs for thermal protection

Achieving well-balanced light weight with simultaneous improvement in mechanical and antioxidant properties of SiC-based composite polymer-derived ceramics (PDCs) for hypersonic vehicle components is still a huge challenge. Herein, lightweight SiC(rGO, xZrB2) composite PDCs were prepared via re-pyrolyzing ball-milling-induced ZrB2-SiC(rGO)p/polycarbosilane-vinyltriethoxysilane-graphene (PCS-VTES-GO, PVG) blends. Main reinforcements consist of ZrB2, ZrO2(ZrC), ZrOSi and SiO2/β-SiC phases, among which favorable compatibility enables enhanced bear loading performances and high-temperature oxidation resistance. Rigid SiC(rGO)p tightly links with flexible PVG pyrolysis products, and co-assembles into robust SiOxCy/Cfree(rGO) matrix in framework owing to plentiful Si-dangling bonds at their interfaces. More interestingly, interfacial ZrOSi/ZrC transition zone can augment structural disorder of ceramic network, give bridging effects, strengthen interfacial compatibility, and even hinder further crack propagation for self-densification. Particularly, SiC(rGO, 30%ZrB2) composite PDCs possess optimal hardness (6.49 GPa) and outstanding fracture toughness (5.77 MPa⋅m1/2). Porous SiC(rGO, 30%ZrB2) composite PDCs own stable structure integrity within 60-min testing under butane torch flame at 1300 °C. Self-healing protective SiO2-ZrO2 glass layer avoids destructive structure and timely covers defects, thus retains good mechanical performances. Such good synergistic reinforcement and multiscale design of porosity-controlled composite, realizes integration of lightweight/good load-bearing characteristics with improved oxidation resistance for thermal protection system (TPS) of hypersonic vehicles.

Résultats fonctionnels et facteurs pronostiques des traumatismes oculaires par armes à feu chez les militaires en zones de conflits au Cameroun

Purpose: To study prognostic factors and functional visual outcomes of soldiers after firearm-related ocular trauma in the conflict zone.Materials and Methods: A cross-sectional analytical study was carried out from January 2017 to December 2022 in the ophthalmology departments of three military hospitals. Soldiers with firearm-related ocular trauma were selected. Epidemiological and clinical data, prognostic factors and functional outcomes were studied. Statistical analyses were performed using IBM-SPSS version 23.0 software. Univariate and multivariate analyses were performed, and a p-value < 0.05 was considered statistically significant.Results: A total of 162 eyes of 136 patients were included. The mean age was 28.93 ± 6.52 years. All patients were male. Improvised firearms were the most frequent cause (77%). Bilateral involvement was observed in 26 patients (19.1%). The mean visual acuity of the affected eyes was 1.66 ± 1.04 logMAR on admission. Closed globe injuries predominated (72%). The most frequent anatomical lesions of the globe were hyphema (23.4%) and vitreous hemorrhage (19.7%). The mean final visual acuity was 1.38 ± 1.17 logMAR, and blindness was observed in 50% of eyes. Factors influencing final visual acuity were type of trauma, initial visual acuity, hyphema and vitreous hemorrhage.Conclusion: Blindness due to firearm-related eye injuries in the conflict zone of Cameroon is common. Wearing protective glasses or visors might reduce its frequency.

The hazardous protective glass material for gamma, neutrons, and behaviors of charged particles: Results of adding barium oxide concentrations

The objective of this research is to examine the effectiveness of gamma and neutron shielding, as well as to investigate the behavior of charged particles in glass compositions with the formula xBaO:5SnO2:10Na2O:10CaO:10Li2O: (65-x)SiO2. These glass compositions will be created using the melt quenching technique (MQT). The findings indicated that the physical characteristics, such as density and molar volume, exhibited a comparable pattern. The gamma-ray shielding capacity of the glass system was assessed by comparing it with theoretical, simulation, and experimental values obtained using WinXCom, PHITS (Particle and Heavy Ion Transport Code System) Monte Carlo simulation, and Compton scattering technique (CST), respectively. The results revealed that the total attenuation (μm), effective atomic number (Zeff), and electron density (Nel) exhibited a consistent increase with higher BaO contents. Additionally, this increase led to a decrease in scattering energy within the Compton energy range. The half-value layer (HVL) exhibited superior shielding characteristics compared to alternative substances. Furthermore, the addition of more BaO atoms in the glass structure results in an increased ability of the material to stop the motion of charged particles with larger mass. Conversely, lower concentrations of BaO demonstrate an efficient barrier against fast neutrons. The simulation revealed that BaO can be utilized as an additive in glass materials to enhance their radiation shielding properties in environments with high levels of radiation.

Single‐crystalline indium selenide fibers by laser‐induced recrystallization and their tunable whispering‐gallery‐mode lasing by pressure‐modulating

AbstractIndium selenide (InSe) crystal, as an emerging Van der Waals semiconductor, showed great potential in optical and optoelectronic devices due to its remarkable electron mobility, flexible direct bandgap, and photoresponsivity. Especially, the bulk single‐crystalline InSe shows superplastic deformability with the aid of the interlayer gliding and cross‐layer dislocation slip. The extraordinary mechanical behavior brings significant opportunities and possibilities to pressure‐modulated optical devices, which, however, have not been explored sufficiently. Additionally, InSe crystals are challenged in the rapid large‐scale preparation and reproduction due to limitations, such as phase heterogeneity, dissociation risks, and chemical instability. Herein, we proposed a fiber drawing technique to create single‐crystalline InSe by the molten core drawing method combined with CO2 laser‐induced recrystallization. The fabricated InSe fiber, spanning several meters in length, shows a uniform and directional single‐crystalline InSe core encased within a 450 µm thick protective borosilicate glass cladding. The inherent core‐cladding configuration of the InSe fibers not only provides robust protection to the InSe crystals but also seamlessly creates a whispering‐gallery‐mode microcavity. Utilizing a 532 nm nanosecond pulsed laser as a pump, a tunable lasing from 1076.2 to 1111.8 nm was achieved, dictated by the controlled pressure within the InSe fiber. We present a simple and effective method for single‐crystalline InSe fabrication and first achieve a pressure‐modulated laser in a near‐infrared band based on InSe fiber, heralding an advancement for the scalable, efficient generation of tunable lasers.

Protective Glass in the Design of Outdoor Luminaires

In accordance with the requirements of the decree of the government (DG) of the Russian Federation, protective glass is a mandatory element of the design of utilitarian outdoor luminaries. The paper analyses the relevance of this requirement and explains the functions performed by this structural element. The protective glass of the outdoor luminaire provides significant advantages of LED outdoor lighting installations (LOLI), confirmed by analysis of the literature, calculated estimates and during experimental studies of characteristics changes during operation. Considering the identified dependencies is advisable when determining the outdoor luminaire’s maintenance and dirt depreciation factor for luminaries’ various designs.

Brittle cornea syndrome—A rare genetic disease

To report a case of an 8-year-old girl who presented with bluish discoloration of sclera, keratoconus, and progressive high myopia. She had a history of recurrent shoulder dislocation. A general physical examination showed a midfacial hypoplasia, upturned nares, thick and tented upper lip, and hyperextensible joints. The genetic analysis showed ZNF469 mutation suggestive of Brittle cornea syndrome 1 (BCS-1). We aim to highlight the importance of timely diagnosis and early provision of protective glasses seems to be the most important step in treating BCS.

A case of epiretinal membrane secondary to diode laser epilation due to the use of incorrect protective glasses

:A 37-year-old female patient presented to the emergency department with the complaint of sudden blurred vision and metamorphopsia in her left eye. She tried the new Diode laser epilation device with another device's protective glasses. Visual acuity was 0.5 in left eye and 1.0 in right eye. A yellow-white lession localized at nasal region of fovea in the left eye. OCT revealed intraretinal and minimal subretinal fluid, disruption of the elipsoid zone and damage to the outer retinal layers. On the 10th day, intraretinal fluid was completely resolved and her vision level increased to 1.0. At the 6th month examination, the visual level was 0.8, and epiretinal membrane was observed. It is very important to use glasses suitable for the wavelength of each device. Glasses should not be switched between laser devices.

Advancing solar distillation efficiency through calcium hydroxide coating and enhanced configuration of mirror-assisted system

While solar distillation presents an eco-friendly and sustainable means of obtaining potable water, its capacity to generate water is relatively modest. The principal objective of this research endeavor resides in the enhancement of the condensation mechanism within solar distillation apparatuses, concurrently ameliorating thermal losses from the distiller's rear wall (MSS). This enhancement is achieved through the strategic application of a calcium hydroxide coating onto the rear surface of back wall of conventional solar still (CSS). This study investigated the performance of the solar still painted by five distinct binder material ratios (10 %, 20 %, 30 %, 40 %, and 50 % by weight) relative to the calcium hydroxide component. Additionally, the application of the calcium hydroxide paint on the rear wall was tested with and without a protective glass panel. Finally, incorporation of mirrors in conjunction with a protective glass panel preceding the paint application was investigated. The experimental observations have led to a significant insight: a binder ratio of 20 % yields optimal adhesive qualities while concurrently upholding cohesion strength. The MSS with glass plate and mirrors exhibited the most impressive performance, with a yield rise of 130 % and an efficiency of 53.5 %. The costs of freshwater of CSS and MSS were 0.02 and 0.015 $/L.

Performance of Cow Evaluation System Elements in Simulated Environmental Conditions

Animal phenotype assessment plays a crucial role in enhancing the genetic potential of domestic breeds. Currently, research is underway to digitize and automate phenotyping through optical systems, enabling the recognition and evaluation of animals’ linear parameters. A prototype of a non-contact monitoring system for livestock phenotype indicators is currently under development. The movement of animals within the model (a laboratory measuring stand) is restricted by a specially designed transparent barrier made of polyethylene terephthalate, enabling the capture of three-dimensional photographs of the animals’ exterior. To validate the suitability of glass for this purpose, laboratory tests were conducted. (Research purpose) The research aims to determine the degree of relationship between protective glass contamination and the accuracy of the optical animal recognition system. (Materials and methods) The paper outlines the specifications of the laboratory stand, facilities, and equipment used, along with the methods employed and experimental conditions. The probability of determining the degree of protective glass contamination was quantified on a scale of 0 to 1, with a value of 0.78 indicating a high likelihood of accurate determination. (Results and discussion) The findings reveal that the system for determining the linear parameters of animals can operate reliably even when the protective glass is contaminated up to 30 percent. When the contamination reaches 50 percent due to inadequate glass cleaning, the system’s ability to recognize points of interest reduces by a factor of 1.625. Furthermore, at 80 percent contamination, achieving high-quality data collection becomes unfeasible as the camera fails to recognize the object. Proper cleaning of the glass is imperative to maintain the system stability. (Conclusions) The optical system enables the recognition and evaluation of animals’ linear parameters, provided that the protective glass of the laboratory stand is contaminated by no more than 50 percent and undergoes high-quality cleaning. At lower levels of glass contamination, up to 30 percent, these estimates exhibit a 2.6-38 percent increase compared to other contamination levels.

Preliminary Study of the Effect of pH on Ce, Nd, La, Pr Recovery from REOH Concentrate

The separation of uranium, thorium, and rare earth elements (REE) from monazite sand was carried out using the PLUTHO pilot plant facility. The REEs were produced in the form of hydroxide concentrates (REOH). Further separation process must be carried out to obtain high-purity elements for application in advanced industries such as polisher material for hard materials, infrared protective glass, and Ni-metal hydride batteries. The Major Element of REEs are Cerium (Ce), Lanthanum (La), Neodynium (Nd), and Praseodymium (Pr). Those elements can be separated by various methods such as fractional precipitation, extraction, ion exchange, and others. This research was carried out using the Fractional Precipitation method. Rare earth elements have chemical properties that permit ready dissolution and easy precipitation. The fractional precipitating reagent commonly used is NH4OH because it will not contaminate the precipitate due to the volatility of NH3. The parameter used in this preliminary study was pH from 4 to 9. The separation process was started with the dissolution of the REOH concentrate in a solution of HNO3 to obtain RE nitrate. After the dissolution process, oxidation and precipitation were carried out by the addition of KMnO4 as an oxidizing agent and Na2CO3 as a precipitating agent at pH 4 to obtain high recovery efficiency of cerium. The precipitation was pH varies continued by pH adjustment using NH4OH starting from pH 4 to pH 9 to separate La, Nd, and Pr. The analysis of Ce, La, Nd, and Pr concentration was carried out using ICP-OES. The optimum pH recovery for Ce, Nd, and Pr was found at pH 4 with a concentration of 19986.4 ppm, 3532.34 ppm, and 3796.81 ppm, respectively, while at pH 8.5 for La with a concentration of 5846.59 ppm.

Evaluation of large-scale marking with alizarin red S in different age rainbow trout fry for nonlethal field identification

Fry of rainbow trout, Oncorhynchus mykiss (Walbaum, 1792), was subjected to one-hour and four hours immersion in Alizarin red S (ARS) bath 150 mg · L–1. The experiment involved seven age groups (40, 50, 60, 70, 80, 90, and 100 days) and was conducted to estimate the minimal age of salmonids for mass marking with ARS bath enabling subsequent effective, simple field nonlethal identification, based on fin rays checking. The fish were examined at the ages of 200 and 300 days. The results showed a high retention level of ARS traces in caudal fin rays ensured satisfactory visibility and quick detection. A success rate of marking detection was &amp;gt;90% at 200 and 300 days of age and the fish were immersed in ARS solution from 60 days of age (685°D). This treatment provided better results in fish bathed for four hours. Recognition of marks using a laser pointer and protective glasses was successful even in fish, with a 3.5–5.0 times length increase compared to the marking time. The results indicate a high potential for ARS marking and its field identification for juvenile salmonids, which can significantly expand the possibilities of field experiments.

Stargardt Disease: A Rare Case Report

Introduction : To report a stargardt disease case&#x0D; Case Illustration : A 14 year young boy presented with chief complaints of blurry vision in both eyes since childhood. Progressive loss in his ability to differentiate between faces, colors and point out details of objects. On ocular examination, his visual acuity was 1/60 with retinoscopy value revealed +2.00 Dsph and was unable to read plates of Ishihara chart in both eyes. On indirect ophthalmoscopy optic disc were normal with sharp margins and orange color and absent foveal reflex in both eyes. Numerous small whitish flecks were seen around the macula in both the eyes with an ill-defined circular lesion was seen at the macula with beaten bronze appearance. Supportive therapy such as correction with low vision aids or the provision of sun protective glasses can help in the daily lives of patients.&#x0D; Discussion : Stargardt disease is an inherited macular degeneration that typically presents in the first two decades of life. The prevalence is in the region of 1 in 8–10,000 individuals. Study reported an annual incidence of 0.127 per 100,000. This case was also rarely reported in Indonesia. The age of onset and rate of progression vary greatly, with most experiencing symptoms in their teens or earlier.&#x0D; Conclusion : Stargardt disease case has been reported in a 14 year young boy. Progressive vision loss can be the only vision complaint from the patient. Supportive therapy such as correction with low vision aids or the provision of sun protective glasses can help in the daily lives of patients.

A Review of Photovoltaic Module Failure and Degradation Mechanisms: Causes and Detection Techniques

With the global increase in the deployment of photovoltaic (PV) modules in recent years, the need to explore and understand their reported failure mechanisms has become crucial. Despite PV modules being considered reliable devices, failures and extreme degradations often occur. Some degradations and failures within the normal range may be minor and not cause significant harm. Others may initially be mild but can rapidly deteriorate, leading to catastrophic accidents, particularly in harsh environments. This paper conducts a state-of-the-art literature review to examine PV failures, their types, and their root causes based on the components of PV modules (from protective glass to junction box). It outlines the hazardous consequences arising from PV module failures and describes the potential damage they can bring to the PV system. The literature reveals that each component is susceptible to specific types of failure, with some components deteriorating on their own and others impacting additional PV components, leading to more severe failures. Finally, this review briefly summarises PV failure detection techniques, emphasising the significance of electrical characterisation techniques and underlining the importance of considering more electrical parameters. Most importantly, this review identifies the most prevalent degradation processes, laying the foundation for further investigation by the PV research community through modelling and experimental studies. This allows for early detection by comparing PV performance when failures or degradation occur to prevent serious progression. It is worth noting that most of the studies included in this review primarily focus on detailing failures and degradation observed in PV operations, which can be attributed to various factors, including the manufacturing process and other external influences. Hence, they provide explanations of these failure mechanisms and causes but do not extensively explore corrective actions or propose solutions based on either laboratory experiments or real-world experience. Although, within this field of study, there are corresponding studies that have designed experiments to suggest preventive measures and potential solutions, an in-depth review of those studies is beyond the scope of this paper. However, this paper, in turn, serves as a valuable resource for scholars by confining PV failures to critically evaluate available studies for preventative measures and corrective actions.

The role of protective liners and glass ionomer in managing pulp temperature during light curing.

To evaluate the thermal insulation of protective liners and glass ionomer cement during light-curing procedures. Human third molars underwent Class I preparations with dimensions 5 mm long × 4 mm wide × 4 mm deep in a standardized manner ensured a consistent ±0.5 mm dentin thickness at the pulpal floor. The teeth were attached to a customized oral cavity chamber simulator with a circulating bath at a standardized temperature of 34.2 ± 1oC. The temperature variations at the pulpal floor were captured in real-time by video using an infrared thermal camera (FLIR ONE Pro, FLIR Systems). The materials evaluated were: Dycal (Dentsply), TheraCal LC (Bisco), Activa (Pulpdent), and Fuji II LC (GC). All light-activation procedures were performed with the same light-curing unit (Valo Grand, Ultradent) in standard mode, 1000 mW/cm2, and time of exposure following manufacturer instructions. A power analysis was conducted to determine the sample size considering a minimal power of 0.8, with α=0.05. Statistical analyses were performed using ANOVA and Tukey's test for multiple comparisons. The temperature at the pulpal floor increased above the 5.5 ºC safety threshold difference for clinical scenarios tested. None of the materials provided proper thermal insulation for light-curing procedures (p = 0.25). The higher the number of light-cured steps, the longer the pulp remained above the 5.5 ºC temperature threshold. The materials tested provided improper thermal insulation (Δ > 5.5 ºC). Thus, prolonged or multiple light-curing exposures can be harmful to the pulp tissues. Therefore, for indirect pulpal capping procedures, self-cured materials or a reduced number of steps requiring light curing must be adopted to reduce the amount of time the pulp remains above the 5.5 ºC safety temperature threshold. Key words:Dental Pulp Capping, Calcium hydroxide, Bioactive, Thermal Damage.