Digital Colorimeter Research Articles

The association between ethnoracial characteristics and subjective well-being: a perspective considering social inequalities

ABSTRACT This study explored the association between subjective well-being (measured by life satisfaction) and ethnoracial characteristics (i.e. self-ascription, skin color, and speaking an Indigenous language) in Mexico and the role of socioeconomic inequalities in mediating this relationship. The emerging questions were: ‘What are the associations between subjective well-being and ethnoracial characteristics in Mexico?’ and ‘Are these associations affected by socioeconomic inequalities?.’ A multinomial logistic analysis was conducted, which estimates associations among multiple categories and predictor variables, using the data from the 2019 Project on Ethnoracial Discrimination in Mexico (PRODER, N = 7,037). The results indicated that Indigenous and white self-ascriptions were positively related to life satisfaction, whereas Mestizo and African Mexican identification did not have any association. Concerning skin color, the digital colorimeter measurements indicated that those with a lighter skin color had greater probabilities of having higher levels of life satisfaction. Additionally, those who reported speaking or who have parents speaking an Indigenous language were less likely to be in higher categories of life satisfaction. These results have central implications for the design and implementation of inclusive public policies, and for the design and modification of public programs.

Comparison of Optical Properties and Fracture Loads of Multilayer Monolithic Zirconia Crowns with Different Yttria Levels.

Multilayer monolithic zirconia, which incorporates polychromatic layers that mimic natural tooth gradients, offers enhanced aesthetics and functionality while reducing debonding risks and improving fabrication efficiency. However, uncertainties remain regarding the fracture characteristics of multilayer monolithic zirconia crowns under occlusal loading, whether composed of uniform or combined yttria levels. The current study investigated how variations in yttria levels and thicknesses affected the optical properties and fracture loads of multilayer monolithic zirconia. Samples of multilayer monolithic zirconia in the Vita A1 shade were used, while employing 3Y (SZ) and 4Y + 5Y (AZ) yttria levels. The optical properties, including the color difference (ΔEWS) and translucency parameters (TP00), were measured using a digital colorimeter. The fracture loads were analyzed using a universal testing machine, and fractured surfaces were examined under a stereomicroscope. Statistical analyses assessed the impacts of the yttria levels and sample thicknesses on the optical properties. The ΔEWS values of SZ ranged 3.6 to 4.0, while for AZ, ΔEWS at 0.5 mm was 3.9 and <2.6 for other thicknesses. The TP00 values decreased with an increased thickness, with AZ generally exhibiting greater translucency than SZ. In the fracture load investigations, SZ (>1600 N) generally exceeded AZ (>1260 N), with fracture loads notably increasing with thickness, particularly for premolars (SZ > 3270 N, AZ > 2257 N). SZ predominantly exhibited partial and complete fractures, whereas AZ showed fewer non-fracture categorizations. Complete fractures began with dense, irregular cracks that extended outward to reveal smooth surfaces, while premolars subjected to higher loads exhibited concentric ripple-like structures. Partial fractures revealed radial textures indicative of areas of stress concentration. In summary, higher yttria levels were correlated with increased translucency, while variations in the fracture loads primarily stemmed from differences in the tooth position or thickness. Overall, multilayer monolithic zirconia incorporating combined yttria levels of 4Y + 5Y (AZ) offered high translucency, precise color matching, and substantial fracture resistance, rendering it highly suitable for aesthetic and functional dental applications.

Software and hardware complex based on the STM32F407VG microcontroller for the study of vibra-tions with the LIS3DSH accelerometer

Commonly used color models are reviewed and analyzed, namely the RGB model and subtractive models, including CMY and CMYK. The characteristics of colorimeters based on the use of RGB, CMY and CMYK models have been studied. A comparative analysis of the advantages and disadvantages of RGB and CMYK models was carried out. The developed digital colorimeter allows for express control of color characteristics with high metrological accuracy and does not require a high level of qualification of service personnel. This device reproduces the perception of color by human vision, and its use is intended for both people with normal and impaired vision. The great advantage of this device is its mobility, the speed of measurements and the absence of the need for a specialized laboratory and highly qualified specialists. Full-scale measurements of the output voltage on the photodiodes of the colorimeter corresponding to red, blue and green colors were carried out.

The Effect of Home Bleaching on Color Match with Anterior Single Shade Composite Restoration

Background: Aim of this study is to assess the color matching in class III restorations made with single-shade resin composite after bleaching with different carbamide peroxide concentrations. Methods: In this study, 20 human incisors that were free of caries or enamel abnormalities and freshly extracted for periodontal or orthodontic reasons were cleaned of blood, debris, and calculus. Mesial and distal surfaces were restored with single-shade composite (Omnichroma, Tokuyama, Japan). All samples were randomly divided into two groups, all of the mesial surfaces were isolated, and distal surfaces were coated with %10 and %15 carbamide peroxide (Opalescence PF; Ultradent Products, Inc, USA). Polishing discs (Zenit Flex, President Dental, Germany) were used the composite restoration. Color matching was evaluated on photographs with a digital colorimeter. SPSS software program was used to perform statistical analysis (IBM Corp., Armonk, NY, USA). Results: Statistically significant difference was found between the color matching of the restorations after the 5th treatment with 15% carbamide peroxide (p = 0.004), and at the end of 10th treatment with 10% carbamide peroxide (p = 0.028). Depending on the carbamide peroxide concentration, after the 5th treatment a statistically significant difference was found between 15% and 10% carbamide peroxide (p = 0.000), but no statistically significant difference after the 10th treatment (p &amp;gt; 0.05). Conclusions: After carbamide peroxide bleaching, hard tissue color became lighter. Since there is no color pigment in single-shade composites, color might be lighter after bleaching. Therefore, these composites may be considered safer in bleaching. Keywords: Bleaching, Color Match, Composite

Fracture characteristics and translucency of multilayer monolithic zirconia crowns of various thicknesses

ObjectivesMultilayer monolithic zirconia (M-Zr) crowns can be engineered to achieve gradational translucency and color intensity. However, this modification may compromise the mechanical strength, raising concerns regarding the ability of M-Zr crowns to withstand occlusal stresses. The effects of M-Zr crown thickness on translucency and ability to endure occlusal forces were investigated at different tooth positions (incisors, premolars, and molars). The objective was to determine the minimal thickness of M-Zr crowns used in tooth preparation to meet aesthetic and functional demands. MethodsM-Zr samples (Vita A1) with four thicknesses (0.5, 1.0, 1.5, and 2.0 mm) were prepared and subjected to translucency testing using a digital colorimeter by 3-third and 9-square division methods. Crown-shaped M-Zr samples with three thicknesses (1.0, 1.5, and 2.0 mm) and three tooth positions (incisor, premolar, and molar) were digitally designed, and 2.0 mm metal abutments were fabricated. The samples were bonded to the abutments; their fracture characteristics were evaluated using a universal testing machine, and their fracture surfaces examined using an optical microscope. Statistical analyses included the Shapiro-Wilk test, Pearson correlation, and one-way and two-way ANOVA with a post hoc Tukey HSD test (α = 0.05). ResultsColor analysis results revealed a significant negative correlation between thickness and translucency (r < −0.96, P < 0.01), with the highest values in the incisal region. Cross-sectional profiles confirmed the uniform thickness and morphology of the digitally designed M-Zr crowns. The results of fracture strength analysis showed position-dependent variability, a strong positive correlation with thickness (r > 0.96, P < 0.01), and fracture strengths consistently exceeding 1200 N across all tooth positions. Fracture patterns indicated that thinner crowns at the incisors and molars were more prone to cracking, whereas those at the premolars demonstrated significantly higher strength (4872.51 N, P < 0.05), only with crack or even no fracture occurring at 2.0 mm. ConclusionsThickness significantly influenced both the translucency and fracture strength of M-Zr, with the tooth position playing an additional role, albeit to a lesser extent. Although thinner crowns exhibited lower strength at each tooth position, even at a thickness of 1.0 mm, fracture strength exceeding 1200 N was maintained, surpassing the typical occlusal forces. Thus, it can be asserted that M-Zr crowns with a minimum thickness of 1.0 mm can meet both aesthetic and functional requirements.

Ethnoracial Disparities in Self-Rated Health: Exploring the Impact of Skin Color and Other Ethnoracial Characteristics in Mexico.

This manuscript aims to understand the association between self-rated health and ethnic-racial characteristics (i.e., skin color, self-ascription, and Indigenous language) in the context of the Mexican population. Logistic regression analyses, using the 2019 PRODER (N = 7187)-a representative survey at the national level. We centered the analysis on two measures of skin color: the interviewer assessment of color skin (that has been used in previous studies), and the ITA scale, a measure constructed from optical digital colorimeter readings (a novel method in ethnoraciality studies in Mexico, included in the PRODER survey). In comparison to the interviewer's assessment of skin color, the ITA score shows a significant association with self-rated health, even in the presence of individual conditions, sociodemographic traits, and life-course events. In contrast, ethnic-racial self-ascriptions and speaking of an Indigenous language do not show any statistical associations. Contrary to previous research, our results suggest a positive association between skin color and self-rated health, when the former is assessed with the colorimeter readings; it means that those with lighter color skin are more prone to report a better health perception. It has methodological implications in the way skin color is observed.

Evaluation of shade correspondence between high-translucency pre-colored zirconia and shade tab by considering the influence of cement shade and substrate materials

Statement of problemThe relation between cement color and abutment substrate material and the corresponding effect on the color accuracy of high-transparency pre-colored zirconia (HT-Zr) remains unclear. PurposeThis in-vitro study aimed to investigate the difference in color accuracy when the HT-Zr is bonded to different materials-based substrates with differently colored resin cement. Materials and methodsVita A1 shade HT-Zr with 1 mm thickness was used as the testing sample. The samples were first placed on zirconia (ZR), tooth color resin (CR), and metallic (MT) abutment substrates. Subsequently, four differently colored cements (translucent (TR), bleach, opaque, and A2 shade (A2)) were used for bonding HT-Zr onto the substrate, and the non-bonded group was used as the control group (CG). There were 15 groups in total (n = 10 per group). A digital colorimeter was used to obtain Commission Internationale de l’Eclairage (CIELab) color parameters. The translucency parameter (TP00) of the substrate and sample, as well as color difference (ΔE00) and chroma (C) between the different groups were calculated. Additionally, the ΔE00 and TP00 were compared with the moderately unacceptable match of ΔE00 = 3.6. The statistical analysis was conducted using ANOVA and Tukey HSD post-hoc test (α = 0.05). ResultsHT-Zr exhibited high translucency (TP00 = 11.02 ± 0.18), and the mean ΔE00 of the testing samples ranged between 2.18 ± 0.20 and 13.14 ± 0.31. The ZR-CG and MT-A2 groups showed the highest and lowest lightness separately. The CR-CG group exhibited the highest C, and the ΔE00 was lower than that of 3.6. The MT-TR group showed the lowest C and the highest ΔE00. The inter-group comparison revealed that the ΔE00 for different cement is mostly lower than the acceptable color match of 1.0; moreover, the ΔE00 for all the substrates, excluding the CG group, is higher than 3.6. ConclusionsThe abutment substrate materials and the cement color should be considered with caution when using HT-Zr, with the effect of abutment substrate materials being more apparent in color accuracy. HT-Zr restorations are not recommended for discolored or bleached abutments but only for natural-colored abutments to achieve the optimal color appearance.

Evaluation of different Terminalia chebula varieties and development of functional muffins

Terminalia chebula is a valuable medicinal plant that can be used in human nutrition. The current study was conducted on different varieties of Terminalia chebula (Harad) and aimed to investigate their proximate composition, antioxidant activity (DPPH and FRAP assay), and total phenolic content (TPC) by using different solvents (ethanol, acetone, hexane, and distilled water) for further use in the development of functional muffins. Wheat flour was supplemented with the Harad varieties (at 5%, 7.5%, 10%, or 15%) for the preparation of muffins. The color tonality (L*, a*, b*, C*, and h*) of the final product was measured with a digital colorimeter, and the sensory analysis was performed by using a 15-point scale. The results showed that the DPPH values of the Harad samples varied from 22.16 ± 1.27 to 84.33 ± 1.29, while the FRAP values ranged from 18.65 ± 1.73 to 113.4 ± 2.1 mmol FeSO4/g, depending on the solvent type. TPC in different Harad varieties ranged from 10.77 ± 2.35 to 107.20 ± 1.80 mg GAE/100 g, whereas the total flavonoid content ranged from 3.78 ± 0.03 to 47.91 mg QE/100g. Among Harad varieties, the Kabuli variety contains the highest amount of Ca, Na, and K, namely 95.58, 2.16, and 113.66 mg/kg, followed by the black variety with 89.58, 1.83, and 105.08 mg/kg respectively. The muffins prepared with black Harad give the highest values of the color parameters compared to other samples. According to the consumer’s choice, the sensory profile assessment revealed that the muffins supplemented with 7.5% of different Harad varieties (green, black, and Kabuli) were the most acceptable. Therefore, Harad varieties could partially replace the white flour in muffins to improve their nutritional value. These results can be useful for the bakery industry interested in developing new functional foods.

Disinfection and Isotonic Drinks' Influence on Hardness and Color Stability of Ethylene-Vinyl-Acetate Copolymer Mouthguards Used in Martial Arts: An In Vitro Study.

This in vitro study aimed to evaluate the hardness and color change of an ethylene-vinyl-acetate copolymer (EVA) material for mouthguards after exposition to different cleaning agent solutions and isotonic drinks. Four hundred samples were prepared and divided into four equinumerous groups (n = 100), in which there were 25 samples from each color of EVA (red, green, blue and white). The hardness, using the digital durometer, and the color coordinates (CIE L*a*b*), using the digital colorimeter, were measured before the first exposition and after 3 months of exposition to spray disinfection and incubation in the oral cavity temperature, or immersion in isotonic drinks. The values of Shore A hardness (HA) and color change (ΔE-calculated by Euclidean distance) were statistically analyzed using the Kolmogorov-Smirnov test, multiple comparison ANOVA/Kruskal-Wallis and appropriate post-hoc tests. Statistically significant changes in color and hardness between the tested groups were demonstrated after the use of agents predestined for disinfecting the surface of mouthguards on the tested samples. There were no statistically significant differences in color and hardness between the groups immersed in isotonic sport drinks potentially consumed by competitors practicing combat sports using mouthguards. Despite the changes in color and hardness after the use of disinfectants, the deviations were minor and limited to specific colors of the EVA plates. The intake of isotonic drinks practically did not change either the color or the hardness of the samples, regardless of the tested color of the EVA plates.

Investigation on the impact of quality characteristics and storage stability of foxtail millet induced by air cold plasma.

The aim of this work was to investigate the effects of dielectric barrier discharge-air cold plasma (DBD-ACP, 15-35 kV, 2-12 min) on the quality of foxtail millets. The L and b* values were evaluated by a digital colorimeter representing that the color of millets was significantly changed at 25 kV for 4-12 min or at 35 kV for 2-12 min. The results were consistent with the change of total yellow pigment in millets, indicating that DBD-ACP damaged the carotenoids if the treatment condition was too high. The activity of lipoxygenase and lipase, involving the oxidation and hydrolysis of lipids of millet, decreased significantly induced by DBD-ACP. For example, the lipoxygenase and lipase activity of Mizhi millet was decreased from 44.0 to 18.7 U g-1min-1, 56.0-15.1 U/(mg pro) (p<0.05) after being exposed to 25 kV for 2-12 min, respectively. Changes of color, lipoxygenase and lipase activity, and malondialdehyde content of millets were determined during accelerated storage (40 ± 2°C and 75% Relative Humidity) for 15 days after being treated by DBD-ACP under 15 and 25 kV for 4 min. Results showed that millets treated by DBD-ACP at 15 kV kept a better color with lower malondialdehyde content, and lower lipoxygenase and lipase activity compared to control. This work implied that DBD-ACP is an underlying approach for the storage of foxtail millets.

Color Stability of Zinc Oxide Poly(methyl methacrylate) Nanocomposite-A New Biomaterial for Denture Bases.

(1) Background: The purpose of this in vitro study was to evaluate the color change and stability of a zinc oxide nanoparticle-poly(methyl methacrylate) (ZnO NP-PMMA) nanocomposite for denture base material after immersion in different dietary and cleaning agent solutions. (2) Methods: One hundred samples were prepared and divided into four equinumerous groups depending on the weight content of ZnO NPs. The color coordinates (CIE L*a*b*) were measured using a digital colorimeter, ColorReader (Datacolor AG Europe, Rotkreuz, Switzerland), before and after immersion of the specimens in five different solutions (distilled water, coffee, red wine, black tea, denture cleaning tablet solution) for 6 months. The color changes (ΔE) were calculated using Euclidean distance and analyzed by the Shapiro-Wilk test and the ANOVA/Kruskal-Wallis multiple comparison and adequate post hoc tests. (3) Results: All tested materials showed significant color changes after their exposure to all solutions. Color changes were greatest in the case of red wine and progressed with the duration of the study. (4) Conclusions: The modification of PMMA with ZnO nanoparticles is acceptable in aesthetic terms in 2.5% and 5% weight content; however, color changes are more noticeable with higher nanoparticle content and must be discussed with the patient prior to possible use.

Distillery dried grains with soluble from corn in diet of laying hens

The objective of this study was to evaluate the different levels inclusion of corn DDG in the laying hens diet and its effects on the performance, egg quality, yolk pigmentation and economic analysis. A hundred fifty laying hens (Hisex Brown) were distributed in a completely randomized design with five treatments and six replicates, with five birds per experimental unit. The diet formulations met the nutritional requirements of the chickens, using the following treatments: control diet with the inclusion of 0% of DDG; inclusion of 5%, 10%, 15% and 20% of DDG. There was no effect (P&gt; 0,05) on egg quality and performance parameters, the yolk coloring, by the colorimetric spectrum and digital colorimeter (L and a *); there was an effect with DDG inclusion (P &lt;0,05). The corn DDG has a coloring potential in the egg yolk, making it appear more yellow, without influencing the performance and egg quality on laying hens, besides being a more economical product.

Quality of Crispy Seasoned Flour with Tumang Sago Substitution (Mexroxylon sago Rottb) as a Substitute for Wheat Flour and its Application in Broilers

The utilization of local resources such as tumang sago flour is needed to be conducted to increase diversification of local food with superior quality. This study aims to determine the physicochemical and functional quality of crispy seasoned flour using tumang sago substitution. In addition, the sensory quality of the chicken crispy is also checked using those spiced flour. Tumang sago flour was obtained by drying the sago under the sun until it was dry and then sifted using a 100 mesh sieve. This study used a total of 5 treatments with 5 times. Four treatments were applied namely control (without substitution of sago tumang flour); 10%; 20%; 30% and 40% of sago tumang flour. Observations were made on the crispy seasoning flour, among others: Water Content (SNI-01-02891-1992); Crude Fiber Content (Sudarmadji, et al. (1997); Water Holding Capacity (Subagio, 2006); Oil Holding Capacity (Subagio, 2006); Color (L, a and b) (Digital Colorimeter), while the sensory test chicken crispy (color, aroma, crunch, taste and acceptability). Data on physicochemical quality and color using a digital colorimeter were analyzed using a completely randomized design with a unidirectional pattern, while the quality of crispy chicken accessories was analyzed by Kruskall Wallis' Non-Parametric analysis. If there is a real effect, then Duncan's test is continued. The results showed that the quality of seasoning flour is moisture content (12.518-15.208%), crude fiber content (0.396-2.138%), WHC (64.606-89.855%), OHC (96,373-115,498%), L (87.677-93.330), a (2,153-2,697), b (5,630 – 7,743), while the sensory quality of crispy chicken is color (1,57-4,29), aroma (2,00-4,14), crispy (3,57-3,86), taste (2,86-3,86) and receptivity (2,57-4.00). The addition of Tumang sago flour in different percentages had a significant effect (P&lt;0.05) on water content, crude fiber content, WHC, OHC, color (digital colorimeter), color sensory parameters, scent and acceptance of crispy chicken. In conclusion, the best treatment in this study was seasoned flour with the addition of 10% sago flour.

N, N Diethyl-P-Phenylene Diamine (DPD) Free/Total Chlorine, Coliform and Heterotrophic Bacterial Profile of Polyethylene Terephthalate (PET) and Sachet Water Sold Within and Around University of Benin Campus.

Water quality, free/total chlorine (Cl2) and bacteriological standard, determine the shelf life of water in the hands of the consumers. This study was carried out to determine the free/total chlorine, coliform and heterotrophic bacterial profile of Polyethylene Terephthalate (PET) and sachet water sold within and around the University of Benin Campus. PET/sachet water was randomly sampled from sales vendors and transported to the laboratory in ice condition for analysis. Standard microbiological methods have followed the determination of the coliform and heterotrophic bacterial profile of the sampled water. The digital colorimeter methods with N, N Diethyl-P-Phenylene Diamine (DPD) pillow for free chlorine (DPD 1) and total chlorine (DPD 4) determination in water was used. The free chlorine from PET/sachet water samples of UNIBEN, Faithmark, Dandori and Olivia waters were &gt; 0.1 mg/l, falling short of the recommended World Health Organization (WHO) and Center for Disease and Prevention (CDC) permissible limit (0.2 to 0.5 mg/l). The coliform bacterial counts from this study were recorded as &lt;1.8 MPN, which is less than the WHO and CDC recommended permissible limit. Whereas, the Heterotrophic bacterial counts were well above the recommended limit (&gt; 500 cfu/ml). A proper hygienic regime should be employed during the processing, packing, distribution and sales of PET/sachet water to eliminate high levels of heterotrophic bacteria, which may contaminate the water.

Colors catalog for wood identification

The colors of the woods or their tonalities are infinite, no two trees are the same, we cannot ignore that there are thousands of species in different areas and in different climates with very different characteristics. With the color catalog for wood identification, sought to develop an academic method for wood color identification from a color code. To achieve this objective, 50 samples of wood available at the Wood Technology Laboratory (LTM) of the Faculty of Forest Engineering of the Universidad del Tolima, were duly identified and brushed to bring out the natural color of the wood. A photographic collection was obtained from the woods in the dry and wet state and with the help of software (Adobe Photoshop professional CC) colors were obtained in LAB and RGB notation systems, with a sample of 30 colors distributed randomly throughout the picture. Counteracting information through the use of a portable digital colorimeter with the that the color of each of the samples was measured in both states. As a result, it was obtained a color catalog for 50 species of Colombian woods, in wet and dry state, in which a color palette was added for the description of the color of species not included still in the catalog. This tool has been used in Universidad del Tolima Wood Anatomy lessons in the last year as a verification process of its use, and the initial results are quite encouraging, in the sense that the students have expressed easier handling and easier to understand than the previous tool. Now the challenge is to increase commercial species and seek to reach surveillance and control agencies environment with a view to positively impacting their training and the possibility of improving their work tools and contributing to the reduction of wood illegal trafficking in Colombia.

Citizen science chlorine surveillance during the Flint, Michigan federal water emergency

Rising incidence of waterborne diseases including Legionellosis linked to low chlorine residuals in buildings and the availability of inexpensive testing options, create an opportunity for citizen science chorine monitoring to complement sampling done by water utilities. University researchers and Flint residents coordinated a citizen science chlorine surveillance campaign in Flint, Michigan in 2015–19, that helped expose the nature of two deadly Legionnaires Disease outbreaks in 2014–2015 during the Flint Water Crisis and progress of system recovery during the Federal emergency. Results obtained with an inexpensive color wheel were in agreement with a digital colorimeter (R2 =0.99; p = 2.81 × 10−21) at 15 sites geographically distributed across Flint. Blinded tests revealed good agreement between official (n = 2051) and citizen (n = 654) data in terms of determining whether regulatory guidelines for chlorine were met, but a discovery that the citizen data were statistically lower than the city's (p<0.00001) especially in warm summer months led to recommendations for increased flushing of service lines before measurements. This work suggests that expanded citizen surveillance of chlorine, site specific flushing advice, and guidance on decisions about water heater set point could help consumers reduce Legionella risks in their homes. Citizen science initiatives for chlorine monitoring offer a unique opportunity for mutually beneficial collaborations between consumers and utilities to reduce the main source of waterborne disease in developed countries.

Evaluation of Coloration Degrees of Light-Cured Temporary Filling Materials Kept at Two Different Temperatures

Purpose: The aim of this study is to evaluate the coloration effects of different drinks on temporary restorative materials kept at different temperatures (4ºC, 25 ºC). Materials and Method: Eeach group consisting of 15 samples was randomly divided into 3 subgroups (n = 5), namely Tempit and First Fill, light cured temporary resins were used separately at 4°C in the refrigerator and at 25°C at room temperature a total of 60 (15x4) discs kept at two different temperatures (4ºC, 25ºC ). The samples were polymerized for 40 seconds with a LED light device and all samples were placed in distilled water in a 37 ºC incubator for 24 h. The initial color values of the samples were determined and recorded with the Vita EasyShade digital colorimeter device. Then, the samples were divided into subgroups of 5 (n = 5) and kept in the prepared coffee solution (Nescafe Classic), cherry juice and distilled water at 37°C for a week. The samples were measured on the 1st, 3rd and 7th days. Before each measurement, after washing and drying the samples, the color values were determined with a digital colorimeter device and the color differences (ΔE*) were calculated by recording the data according to the CIE 2000 system. Color difference data were evaluated using one-way ANOVA and Tukey test. Results: Although, the coloration degree was lower in the temporary filling material stored in 25°C, there is no statistically significant difference between the 4°C and 25°C groups. The coloration level of Temp-it was less than First Fill. (p&lt;0.05) The highest average ∆E value among all groups was obtained at 4°C in the First Fill group in the coffee solution. Conclusion: It is concluded that the use of light-cured resin-containing temporary restorative materials in the front areas of anterior teeth where aesthetics are important, the use of light-cured temporary filling materials that are heated at 25°C will result in less coloration.

Application of digital colorimeter for preliminary characterization of gold nanoparticle swarms produced by Termitomyces heimii using a novel Bioinspired Microfluidics assay

In our laboratory work extending over several years we have successfully studied the biogeochemical role of termite mounds and their occupants the termites and the exosymbiont fungus-Termitomyces. Fungi appear to be promising for large scale production of nanoparticles (NPs) as these are simpler to grow both in laboratory and at industrial scale. This paper reports a novel microfluidics based assay system to detect Gold bioreduction capacity of different tissues in tissue based and cell free environment. Using sterile microtest well, different tissues such as umbo, pileus, lamellae, stipe context, stipe epicutis, pseudorrhiza context, pseudorrhiza epicutis of Termitomyces heimii mature fruitbodies were tested with 200μl chloroauric acid (one mM) and after an interval of 5,10, 15, 30, 45, 60, 120 min and 12, 24 and 48 hours. The results in terms production of distinct nanoparticles were directly visualized microscopically and using mobile based digital colorimeter. Membrane filtered sterile water soluble extracts (SWSE) from the same tissues were similarly screened. The results manifested by mono and polydisperse GNPs and microparticles of mixed size groups demonstrated that cell free system can be potentially useful for bioinspired fabrication of GNPs. Further work in this direction is in progress using several termitomyces cultures.

Clinical threshold of the translucency parameter of maxillary central incisors

The aim of this in vivo study is to describe the clinical threshold and relative factors associated with the translucency of maxillary central incisors. Bilateral maxillary central incisors were measured in 106 individuals using a digital colorimeter against black and white backings. The translucency parameters (TP) of incisors and the difference in TP (ΔTP) between the left and right maxillary central incisors of the same individual was calculated. The mean TP value of the maxillary incisors was 8.22. There was a significant effect of age on the translucency of the maxillary central incisors (p<0.05). The TP of females was higher than that of males (p<0.05). The absolute mean value of ΔTP was 1.33. The ΔTP of the two maxillary central incisors in the same individual can be used as a reference for the threshold value of translucency.

Comparison of automated method and photometric cyanmethemoglobin method for haemoglobin estimation

Haemoglobin is one of the commonest tests required in pathology labs. There are many methods of haemoglobin estimation. Common methods used are sahli’s acid hematin method, photometric cyanmethemoglobin method with hemoglobin estimation by colorimeter, automated method by cell counter.To evaluate accuracy of hemoglobin estimation by manual photometric method versus automated method by hematology cell counters using the same sample at the same time.Blood samples of 460 adult patients and 72 children (&amp;#60;15 Yrs), including outdoor and indoor, between May 2019 to Aug 2019, attending H.I.M.S.were collected in EDTA tubes. Samples were properly mixed on blood shaker. Hemoglobin estimation done by photometric cyanmethemoglobin method by AIMIL digital colorimeter and by Mindray (BC5150) automated cell counter.Results by photometric method showed higher mean value compared to automated method by 2.52%. Commercial control results showed 2.2% coefficient of variation by Mindray cell counter and 2.9% by photometerBoth methods are accurate with 2.52% more mean value in photometric method. When Haemoglobin is the only test required, photometric method is cost effective and feasible. If sample size is large as in tertiary care hospitals and multiple parameters like complete blood count (CBC) are needed, automated method is time effective and feasible