scholarly journals Color-Matching and Blending-Effect of Universal Shade Bulk-Fill-Resin-Composite in Resin-Composite-Models and Natural Teeth

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Rasha M. Abdelraouf ◽  
Nour A. Habib
Keyword(s):  
Resin Composite ◽  
Visual Assessment ◽  
Color Difference ◽  
Color Measurement ◽  
Color Matching ◽  
Occlusal Caries ◽  
Close Match ◽  
Visual Scoring ◽  
Composite Models ◽  
Natural Teeth

Objectives. To assess visually color-matching and blending-effect (BE) of a universal shade bulk-fill-resin-composite placed in resin-composite-models with different shades and cavity sizes and in natural teeth (extracted and patients’ teeth).Materials and Methods. Resin-composite-discs (10 mm × 1 mm) were prepared of universal shade composite and resin-composite of shades: A1, A2, A3, A3.5, and A4. Spectrophotometric-color-measurement was performed to calculate color-difference (ΔE) between the universal shade and shaded-resin-composites discs and determine their translucency-parameter (TP). Visual assessment was performed by seven normal-color-vision-observers to determine the color-matching between the universal shade and each shade, under Illuminant D65. Color-matching visual scoring (VS) values were expressed numerically (1–5): 1: mismatch/totally unacceptable, 2: Poor-Match/hardly acceptable, 3: Good-Match/acceptable, 4: Close-Match/small-difference, and 5: Exact-Match/no-color-difference. Occlusal cavities of different sizes were prepared in teeth-like resin-composite-models with shades A1, A2, A3, A3.5, and A4. The cavities were filled by the universal shade composite. The same scale was used to score color-matching between the fillings and composite-models. BE was calculated as difference in mean-visual-scores in models and that of discs. Extracted teeth with two different class I-cavity sizes as well as ten patients’ lower posterior molars with occlusal caries were prepared, filled by universal shade composite, and assessed similarly.Results. In models, the universal shade composite showed close matching in the different cavity sizes and surrounding shades (4≤VS<5) (BE = 0.6–2.9 in small cavities and 0.5–2.8 in large cavities). In extracted teeth, there was good-to-close color-matching (VS = 3.7–4.4 in small cavities, BE = 2.5–3.2) (VS = 3–3.5, BE = 1.8–2.3 in large cavities). In patients’ molars, the universal shade composite showed good-matching (VS = 3–3.3, BE = −0.9–2.1).Conclusions. Color-matching of universal shade resin-composite was satisfactory rather than perfect in patients’ teeth.

The optimization of color-prediction models for colored cotton fiber yarns

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4007-4014 ◽  
Author(s):  
Liu Yang ◽  
Jing Bai ◽  
Ruiyun Zhang ◽  
Yi Ding ◽  
Feng Ji ◽  
...  
Keyword(s):  
Prediction Models ◽  
Color Difference ◽  
Color Measurement ◽  
Target Color ◽  
Color Matching ◽  
Average Color ◽  
Color Differences ◽  
Computer Aided ◽  
Colored Cotton ◽  
Color Prediction

Color matching is necessary in the manufacture of colored fiber yarns, and its accuracy is one of the main goals in computer-aided color matching. A limited number of pre-colored fibers are blended to match the target color through predicted recipes. Of the color-prediction models applied in computer-aided color matching, two common ones, Stearns-Noechel and Friele, were selected to be modified to improve the color-prediction accuracy in this paper. The models were modified in three ways, in which the pending parameters in the models were determined through statistical analysis depending on median, wavelength, and components; thus, the Stearns-Noechel model was modified to Stearns-Noechel 1, Stearns-Noechel 2, and Stearns-Noechel 3, and the Friele model was modified to Friele 1, Friele 2, and Friele 3. The six modified models were affirmed through 261 colored fiber yarns prepared from five primary cotton fibers, including two-, three-, four-, and five-primary blends. The prediction results of 261 samples showed that Stearns-Noechel 3 had the highest accuracy among the modified Stearns-Noechel models, especially for four-primary blends with an average color difference of 0.50 Color Measurement Committee (CMC) (2:1) units, whereas Friele 1 had the highest accuracy among the modified Friele models, especially for five-primary blends with an average color difference of 0.46 CMC (2:1) units. These results indicate the modified model Stearns-Noechel 3 can be used in color prediction when there are fewer than five yarn components, and Friele 1 can be used for five components with lower color differences that better meet color-matching requirements in practical production.

Evaluation of Color-matching Ability of a Structural Colored Resin Composite

2021 ◽  
Author(s):  
M Saegusa ◽  
H Kurokawa ◽  
N Takahashi ◽  
T Takamizawa ◽  
R Ishii ◽  
...  
Keyword(s):  
Resin Composite ◽  
Color Measurement ◽  
White Background ◽  
Color Matching ◽  
Background Color ◽  
Cavity Depth ◽  
B Values ◽  
Black Background ◽  
Artificial Teeth ◽  
Excellent Color

Clinical Relevance Although excellent color-matching ability was confirmed for the structural colored resin composite Omnichroma, care should be taken to ensure that the appropriate chromatic color conditions for restoration are achieved in the oral environment. SUMMARY Purpose: The present study evaluated the color-matching ability of a structural colored resin composite to compare it with resin composites employing pigments. Methods and Materials: A structural colored resin composite (Omnichroma [OMC]), a supranano-filled resin composite (Estelite Σ Quick [ELQ]), and a nano-filled resin composite (Filtek Supreme Ultra [FSU]) were used. Each resin composite was packed into a Teflon mold and pressed down with a clear strip under a glass slide. The specimens were light irradiated through the slide with a light-emitting diode curing unit. The thickness of the specimens (n=6) was measured with a digital caliper before being transferred to distilled water and stored at 37°C for 24 hours. The measurements of the optical characteristics of the specimens on a black-and-white background were performed using a spectrophotometer. D65 (CIE D65) was used as a light source for the spectrophotometer. Measurements were repeated three times for each specimen under each color-measurement condition, and average values for three same-shade specimens were calculated. One-way analysis of variance and Tukey post hoc tests were used (α=0.05). To determine its ability to match the color of artificial teeth, each shade of resin composite was placed in a cavity before performing color measurements. Using a spectrophotometer (CMS-35F S/C) with a flexible sensor, L*, a*, and b* values were obtained. Results: The spectral reflectance curve of OMC showed that it reflected light wavelengths from 430-700 nm regardless of the background color and thickness of the specimens. The percentage of reflectance of ELQ decreased near wavelengths of 550-580 nm. Regarding the influence of background color on CIE L*, a*, b* values, the L* level showed significantly higher values for all tested materials with white backgrounds, and OMC was most affected by the difference in background color. However, a* values of ELQ and FSU were significantly higher with a black background than with a white background, and OMC showed a significantly higher value with a white background than with a black background. The b* values were higher with a white background than with a black background and were significantly higher for all three products, and these tendencies were much greater for ELQ and FSU. Conclusions: The ability of OMC to match the color of artificial teeth showed acceptable color compatibility, regardless of the shade of the artificial teeth and the depth of the cavity. However, ELQ and FSU showed reduced color compatibility, especially for a cavity depth of 3.0 mm. Excellent color matching ability was confirmed for the structural colored resin composite OMC, resulting in reduced color differences and therefore improving the esthetic appearance of the restoration, simplifying shade matching, and compensating for any color mismatch.

scholarly journals Color Stability of Restorative Materials in Response to Arabic Coffee, Turkish Coffee and Nescafe

2013 ◽  
Vol 14 (4) ◽  
pp. 681-690 ◽  
Author(s):  
Khalid H Al-Samadani
Keyword(s):  
Color Change ◽  
Resin Composite ◽  
Color Stability ◽  
Color Difference ◽  
Composite Resins ◽  
Color Measurement ◽  
Water Control ◽  
Mean Values ◽  
Significance Level ◽  
Restorative Materials

ABSTRACT Objective To evaluate the effect of Arabic coffee, Turkish coffee and Nescafe on the color stability of four different composite resins after a period of aging time 1, 7 and 30 days. Materials and methods Twenty specimens from each type of tested composite resin material were prepared. Five specimens from each tested material (Z350 XT, Artist, GC and Z250) was evaluated after storage in Arabic coffee, Turkish coffee, Nescafe and distil water (control) at 37°C in a dark container for 1, 7 and 30 days. Color measurement was done using colorimeter based on the CIE L* a* b* color scale. Color differences ΔE*ab, Δb* and Δa* among specimens immersed in distil water and staining coffee beverages were evaluated overtime. Mean values were statistically analyzed with one-way analysis of variance (ANOVA), followed by Tukey test with p < 0.05 as significance level. Results All tested composite resins showed increase color change after a period of 1, 7 and 30 days. The color change ΔE*ab, Δb* and Δa* exhibited by Arabic coffee, in Turkish coffee and Nescafe except Δa*. The highest total color difference ΔE*ab after 30 days was in group A Arabic coffee (ΔE > 1.5 perceivable) and not perceivable in group B Turkish coffee and group C Nescafe. For Δb* all materials discolored toward yellowness after 30 days except Arabic coffee group which shifted from yellowness toward blueness (Δb*> 1.5 perceivable). Conclusion The effect of staining beverages on the resin composite materials increases with time of aging toward yellowness and not perceivable in all groups except with Arabic coffee which had highest effect after 30 days and the discoloration shifted from yellowness to blueness perceivable. How to cite this article Al-Samadani KH. Color Stability of Restorative Materials in Response to Arabic Coffee, Turkish Coffee and Nescafe. J Contemp Dent Pract 2013;14(4):681-690.

Investigating the Possibility of Determining the Sequence Intersecting Lines between LaserJet Printing and Handwriting in Document Examination using Color Measurement Technique

2022 ◽  
Author(s):  
Atefeh Tajik Esmaeili ◽  
Mahdi Safi ◽  
Maryam Ataeefard ◽  
Alireza Mahmoudi Nahavandi
Keyword(s):  
Measurement Technique ◽  
Color Change ◽  
Visual Assessment ◽  
Color Difference ◽  
Assessment Process ◽  
Color Measurement ◽  
Visible Range ◽  
Arduous Task ◽  
Colorimetric Data ◽  
Document Examination

In Questioned Documents Examination, the sequence of crossing lines in the intersection of handwriting and printed area can be important clues for detecting tampered documents. Recognition of such documents is a arduous task and requires people with experience and expertise. In the present work, we investigated the possibility of determining the sequence of intersecting lines between LaserJet printing and handwriting for a series of simulated laboratory specimens in the document examination using color measurement technique. The spectral reflectance curves and color coordinates of some points on and out of the cross lines were compared. Four different commercial ballpoint pens and a black toner LaserJet were used to prepare the specimens. The color change of the intersecting lines was subjectively considered through the captured images and a visual assessment process. It was also objectively determined by determining the color difference values from the colorimetric data in CIELAB and CIELCH color spaces in the visible range. The color change evaluation showed that the order in which printing or handwriting is applied alters colorimetric results. Moreover, the investigations showed small color difference values of less than 2 units between a point of printed area individually, and intersection could be applied as a tolerance limit for pass/fail judgments.

The pugometer: an evaluation of a new tool for assessing treading damage of pasture soils and comparisons with other methods

Soil Research ◽  
2018 ◽  
Vol 56 (6) ◽  
pp. 568
Author(s):  
J. A. Howes ◽  
J. A. Hanly ◽  
D. J. Horne ◽  
M. J. Hedley ◽  
M. Irwin
Keyword(s):  
Quantitative Measure ◽  
Visual Assessment ◽  
Nutrient Loss ◽  
Spatially Explicit ◽  
Strong Correlations ◽  
Large Area ◽  
Roller Chain ◽  
Visual Scoring ◽  
Soil Physical Quality ◽  
Small Plot

Treading damage inflicted by grazing animals degrades soil physical quality, increases sediment and nutrient loss to water, and reduces pasture yield. The extent or severity of treading damage can be assessed using several methods such as roller chain, depth of pug, and visual scoring. However, the ability of these methods to assess treading damage, and their relative merits, have not previously been compared. Four methods of measuring treading damage are compared in this study including the three methods mentioned and a new tool called the pugometer, which was developed to measure treading damage in a spatially explicit manner. These comparisons were conducted on three paddocks at Massey University’s Dairy 4 farm near Palmerston North, Manawatu, New Zealand which had sustained treading damage of varying levels during grazing in wet conditions. All four methods were able to identify varying degrees of treading damage competently with strong correlations between them (R2 = 0.72–0.87). Therefore, the selection of the most appropriate method to assess treading damage will depend on the circumstances. Visual scoring was the quickest and simplest method to use over a large area, and so could be employed easily by a farmer. The pugometer provides a quantitative measure of the spatial variability of treading damage and so would be a useful research tool. The depth of pug and roller chain methods are reliable but much more time consuming and therefore are only practicable as research tools for small plot studies. Following a treading event, the pugometer was able to monitor the recovery of surface roughness in a spatially explicit and rapid manner. Additional keywords: depth of pug, quantifying pugging, roller chain, visual assessment.

scholarly journals Quality of screen printing in knit fabric for different mesh count on semi solid design

2020 ◽  
Vol 6 (6) ◽  
Author(s):  
Rasheda Begum Dina ◽  
Md Zulhash Uddin ◽  
UmmulKhair Fatema
Keyword(s):  
Screen Printing ◽  
Visual Assessment ◽  
Color Difference ◽  
Mesh Screen ◽  
Microscope Images ◽  
Different Types ◽  
Digital Microscope ◽  
Semi Solid ◽  
Screen Mesh

In semi solid design, the parameters of the quality of the printed fabric were color fastness, level of print detail, color difference, print coverage, saw-tooth effect, line sharpness etc. Actually, printed fabric quality was evaluated by these parameters. Again, print coverage, saw-tooth effect, line sharpness, etc. were examined by estimating different distances, angles etc. in printed fabric and these factors were compared with image positives. Mesh opening effect on the quality of screen printed fabric was investigated after printing the semi solid design on knit fabric using different mesh count screens and different types of the link. To print semi solid design on knit fabric different types of ink as well as non-identical mesh count was used. Then mesh screen out come on the design and form of printed fabric in screen printing was examined. For the evaluation of semi solid design effect there remains two different methods.The first one is visual assessment and another way is microscope observation. Here, to determine the probability of the amount of ink flowing by the screen, mesh opening area of every screen was considered and it was done from respective digital microscope images.

Simulation of chromatic and achromatic assessments for camouflage textiles and combat background

2022 ◽  
pp. 154851292110677
Author(s):  
Md Anowar Hossain
Keyword(s):  
Remote Sensing ◽  
Image Processing ◽  
Measurement Techniques ◽  
Color Difference ◽  
Optical Signal ◽  
Color Measurement ◽  
Pixel Intensity ◽  
Variation Versus ◽  
Processing Software ◽  
Imaging Sensor

Chromatic and achromatic (AC) assessments of camouflage textiles have been critical to the defense researchers for concealment, detection, recognition, and identification (CDRI) of target signature against multidimensional combat background (CB). AC assessment and camouflage measurement techniques are simulated and experimented for assessment of camouflage textiles against CB. This model has been demonstrated for color measurement spectrophotometer, scanning electron microscopy (SEM), digital imaging, hyperspectral imaging, and image processing software (ImageJ) for the advancement and establishment of AC camouflage textiles assessment. The chromatic variations of 48 artificial target objects (TOBs) have been synthesized by image processing; the technique can be implemented for defense CB-CDRI assessment. Microstructural variation versus optical signal of woodland, desertland and stoneland CB materials have been elucidated by SEM magnification. The achromatic variation of CB materials have been demonstrated for the replacement of optical signal against modern remote sensing device to the imaging sensor. Color difference (Δ E), microstructural variations, pixel variations to imaging signal and standard deviation of CB materials have been represented for remote sensing surveillance of defense applications against TOB-CB-CDRI. Technical simulation of color, texture, gloss, and pixel intensity has been derived for AC-CDRI assessment of camouflage textiles in TOBs-CB environment.

Color-matching model of digital rotor spinning viscose mélange yarn based on the Kubelka–Munk theory

2021 ◽  
pp. 004051752110408
Author(s):  
Ruihua Yang ◽  
Chuang He ◽  
Bo Pan ◽  
Zhuo Wang
Keyword(s):  
Least Squares ◽  
Color Difference ◽  
Test Sample ◽  
Experimental Results ◽  
Color Matching ◽  
Matching Model ◽  
K Value ◽  
Rotor Spinning ◽  
Viscose Fibers ◽  
Relative Value

The color-matching model is conducive to expanding the scope of application of colorful fabrics and can speed up the achievement of intelligent production. To solve the problem in which the existing color-matching system of intelligent colored spun yarn cannot be applied to the digital rotor-spinning products of dope dyed viscose fiber, 66 types of mélange yarn were spun with a digital rotor-spinning frame using red, yellow, and blue dope dyed viscose fibers at a ratio gradient of 10%. Furthermore, the knitted fabric samples were produced using a circular machine. Meanwhile, a Datacolor 650 spectrophotometer was used for color testing, and the experimental results were recorded. Based on the color-matching model of the Kubelka–Munk theory, a color-matching model is built based on the experimental results. In addition, the accuracy of the model was analyzed and verified using the least-squares and relative value methods. The results show that, compared with the relative value method, the color-matching model constructed using the absorption coefficient K value and scattering coefficient S value calculated based on the least-squares approach is more accurate. The error between the predicted ratio of the test sample and the actual ratio was only 0.0979, the average color difference was only 0.465, and there were no visible differences between the predicted color of the sample and the actual color.

Chemical-Free Scouring and Bleaching of Cotton Knit Fabric for Optimum Dyeing Performance

2019 ◽  
Vol 37 (4) ◽  
pp. 265-280 ◽  
Author(s):  
Md. Abdul Hannan ◽  
Papia Haque ◽  
S. M. Fijul Kabir ◽  
Mohammed Mizanur Rahman
Keyword(s):  
Color Difference ◽  
Color Measurement ◽  
Color Fastness ◽  
Green Method ◽  
Process Stage ◽  
Dyeing Performance ◽  
Acceptable Range ◽  
Knit Fabrics ◽  
Single Jersey ◽  
Infrared Data

The current work endeavored to avoid chemicals during scouring and bleaching of cotton knit fabric in order to introduce a green method. Single jersey single lacoste knit fabrics were treated in water at 105 °C, 120 °C, and 130 °C for 20, 40, and 60 min at reduced process stage. Fourier transform infrared data revealed the weakening and shifting of typical bands of wax and pectin-based cotton impurities in the region of 1,740–1,200 cm−1 for the pretreated samples at 130 °C for 20 min. Color difference (Color Measurement Committee ΔE) was found within the acceptable range for 1.5% and 1% dyed samples when treated at 105 °C for 20 min, while 0.5% dyed samples required 130 °C for 20 min to achieve the desired range. The ratings for color fastness to washing, perspiration, and rubbing were 4–5 for all the chemical-free pretreated samples. The proposed process yielded better strength and dimensional stability compared to the conventionally pretreated samples.

scholarly journals Comparison of Visual and Digital Color Measurement Methods on Anterior Natural Teeth

2018 ◽  
Vol 22 (2) ◽  
pp. 87-92
Author(s):  
Sait Ege Eryürük ◽  
Canan Hekimoğlu ◽  
Elif Tuba Akçin ◽  
Yeliz Çavuşoğlu
Keyword(s):  
Weighted Kappa ◽  
Kappa Coefficient ◽  
Measurement Methods ◽  
Color Measurement ◽  
Central Incisor ◽  
Digital Device ◽  
Natural Teeth ◽  
Digital Methods ◽  
Shade Guide ◽  
Weighted Kappa Coefficient

SummaryBackground/Aim: The purpose of this study was to evaluate compatibility between visual and digital color measurement methods.Material and Methods: The color measurement components of intact natural maxillary right central incisor and left canine teeth of eighty patients were measured with visually shade guide and, digitally, with digital device. The color matchings were performed for each teeth on labial surfaces divided into three regions: cervical, middle and incisal. Ligthness, MLR (M: means middle hue, L designates greener, R designates redder) and chroma levels were assessed for each tooth on divided regions respectively. Measurements were performed by the same and experinced dentist with healthy eyes. The data were analyzed with Kappa and weighted Kappa coefficient (p< 0.05).Results: The compatibility between visual and digital methods did not exist for MLR and chroma. The compatibility between both methods were determined only for ligthness of maxillary central and canine teeth at all regions of labial surfaces.Conclusions: There was compatibility only for ligthness of intact natural teeth at all regions with both methods.

Sign in / Sign up

Export Citation Format

Share Document