Color Analysis

2010 ◽  
pp. 573-586 ◽  
Author(s):  
Ronald E. Wrolstad ◽  
Daniel E. Smith
Keyword(s):  
Color Analysis

scholarly journals A Comparative Evaluation of Nanohydroxyapatite-Enriched Hydrogen Peroxide Home Bleaching System on Color, Hardness and Microstructure of Dental Enamel

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3072
Author(s):  
Riccardo Monterubbianesi ◽  
Vincenzo Tosco ◽  
Tiziano Bellezze ◽  
Giampaolo Giuliani ◽  
Mutlu Özcan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Particle Diameter ◽  
Dental Enamel ◽  
Sem Analysis ◽  
Control Group ◽  
Average Particle ◽  
Color Analysis ◽  
Enamel Microstructure ◽  
Prismatic Structure ◽  
20 Nm

This study aimed to evaluate two hydrogen peroxide (HP)-based at-home bleaching systems in order to analyze whether nano-hydroxyapatite (nHA) addition may represent a reliable and safe solution for tooth whitening without altering dental microstructure and hardness. Human third molars (N = 15) were treated with two bleaching agents, one containing 6%HP (6HP) and the other 6% HP nHA-enriched (6HP-nHA) with average particle diameter ranging from 5–20 nm. Their effects on enamel were assessed using a spectrophotometer, Vickers microhardness (VMH) test and Scanning Electron Microscopy (SEM), comparing the treated groups with the non-treated control group (CTR). Color analysis revealed improvement in whiteness in both groups compared to CTR. VMH test results showed no differences among the groups. SEM analysis highlighted no evident changes in the enamel microstructure of tested groups compared to CTR. At high magnification, in 6HP group, a slight increase in irregularities of enamel surface morphology was observed, while 6HP-nHA group displayed removal of the aprismatic layer but preservation of the intact prismatic structure. These results suggest that the 6HP-nHA agent may be recommended to provide reliable whitening treatment, without damaging the enamel micromorphology and hardness.

scholarly journals Identification of immature and mature myeloma cells in the bone marrow of human myelomas

Blood ◽  
1993 ◽  
Vol 82 (2) ◽  
pp. 564-570 ◽  
Author(s):  
MM Kawano ◽  
N Huang ◽  
H Harada ◽  
Y Harada ◽  
A Sakai ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Adhesion Molecules ◽  
Proliferative Activity ◽  
M Protein ◽  
Color Analysis ◽  
Myeloma Cells ◽  
A Cell ◽  
Immature Cells ◽  
Human Myeloma Cells

Abstract With regard to the expression of adhesion molecules, human myeloma cells freshly isolated from bone marrow were heterogeneous. By two- color analysis with anti-VLA-5 antibody (PE staining) and FITC-labeled anti-CD38 antibody, we found all myeloma cells located at CD38-strong positive (CD38++) fraction and identified two subpopulations among these myeloma cells: CD38++ VLA-5-(VLA-5-) myeloma cells and CD38++ VLA- 5+ (VLA-5+) myeloma cells. To clarify the biologic character of these two subpopulations, the morphology, in vitro proliferative activity and in vitro M-protein secretion were examined in each fraction isolated by the purification procedure or a cell sorter. Morphologic examination showed that VLA-5- myeloma cells were mostly immature or plasmablastic and VLA-5+ cells were mature myeloma cells. Furthermore, VLA-5- myeloma cells proliferated markedly in vitro and responded to interleukin 6 (IL- 6), a growth factor for myeloma cells, while VLA-5+ myeloma cells showed very low uptakes of 3H-thymidine and no responses to IL-6 but secreted higher amounts of M-protein (immunoglobulin) in vitro significantly. Therefore, we could clarify here heterogeneity of human myeloma cells in the bone marrow with regard to the expression of VLA- 5, one of integrin adhesion molecules; VLA-5- myeloma cells were proliferative immature cells and VLA-5+ cells were mature myeloma cells.

Digital color analysis for colorimetric signal processing: towards an analytically justified choice of acquisition technique and color space

2021 ◽  
pp. 130274
Author(s):  
Nikolai Yu. Tiuftiakov ◽  
Andrey V. Kalinichev ◽  
Nadezhda V. Pokhvishcheva ◽  
Maria A. Peshkova
Keyword(s):  
Signal Processing ◽  
Color Space ◽  
Color Analysis ◽  
Acquisition Technique

scholarly journals Examination of Natural Tooth Color Distribution Using Visual and Instrumental Shade Selection Methods

2016 ◽  
Vol 20 (2) ◽  
pp. 104-110 ◽  
Author(s):  
A. Dilek Nalbant ◽  
Yeşim Göknur Babaç ◽  
İrem Türkcan ◽  
Kaan Yerliyurt ◽  
Cihan Akçaboy ◽  
...  
Keyword(s):  
Visual Assessment ◽  
Color Analysis ◽  
Color Distribution ◽  
Tooth Color ◽  
Natural Right ◽  
Value Differences ◽  
Instrumental Color ◽  
Significant Difference ◽  
Visual Matching ◽  
Shade Matching

Summary Aim: Although visual color determination is the most frequently applied method in dentistry, instrumental color analysis offers advantages like objectivity, measurability and rapidity. The aim of this study was to evaluate the natural teeth color in teeth without any restoration visually, and by using a computerized shade measuring and analyzing system in the population.Materials and Methods: 202 patients were inspected. Before instrumental shade matching visual matching was done by the inspector with Vitapan 3D Master Shade Guide in the day light. Images were taken with computerized shade measuring and analyzing system from patients’ natural right or left maxillary incisors and canines without any restoration. Then these images were evaluated by the original software of its own.Results: Value differences between visual and instrumental shade matching were statistically significant. Darker value levels were obtained with instrumental measurement. The distribution of hue was more reddish in instrumental examination than visual examination. Significant difference was found at cervical and middle third of the tooth in both visual and instrumental determination of chroma. Chroma of the tooth was higher at these two regions in visual assessment.Conclusions: Teeth colors were distributed more uniform in visual shade matching compared to instrumental matching. However, some teeth shades were more common in instrumental matching. Value scores were found higher with instrumental shade matching. Individual selection of shades for each tooth and different regions of a tooth instead of a single color is considered to be a factor to increase the success of the restoration.

A transformation technique from RGB signals to the Munsell system for color analysis of tobacco leaves

1998 ◽  
Vol 19 (2) ◽  
pp. 155-166 ◽  
Author(s):  
J. Zhang ◽  
S. Sokhansanj ◽  
S. Wu ◽  
R. Fang ◽  
W. Yang ◽  
...  
Keyword(s):  
Color Analysis ◽  
Transformation Technique ◽  
Tobacco Leaves ◽  
Munsell System
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