Laser-Induced Fluorescence and X-Ray Spectral Analysis of Carious Process in Hard Dental Tissues

2010 ◽  
Vol 149 (3) ◽  
pp. 373-376 ◽  
Author(s):  
G. Yu. Lidman ◽  
P. M. Larionov ◽  
S. V. Savchenko ◽  
E. L. Lushnikova ◽  
A. M. Orishich ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Laser Induced Fluorescence ◽  
X Ray ◽  
Dental Tissues ◽  
Carious Process ◽  
Hard Dental Tissues

scholarly journals PHYSICAL INDICES OF THE ORAL FLUID IN CHILDREN WITH CARIES AND INTACT TEETH AT DIFFERENT AGE PERIODS

2019 ◽  
Vol 72 (5) ◽  
pp. 1048-1052
Author(s):  
Lyudmila F. Кaskova ◽  
Тetyana B. Маndziuk ◽  
Larissa P. Ulasevych ◽  
Natallia B. Kuzniak
Keyword(s):  
Oral Cavity ◽  
Oral Fluid ◽  
Permanent Teeth ◽  
Fluid Viscosity ◽  
Dental Tissues ◽  
Dental Examination ◽  
Dental Diseases ◽  
The Common ◽  
Carious Process ◽  
Hard Dental Tissues

Introduction: Caries occurs most frequently among dental diseases of the hard dental tissues in children. Its occurrence and intensity do not decrease, although scientists and practitioners make much efforts directed to the reduction of these indices The aim: Therefore, the objective of our study was to investigate the indices of rate salivation and viscosity of the oral fluid in children at different age periods with caries and intact teeth. Materials and methods: 134 children, 7-9 years old, and 89 children,10-12 years old, studying at Poltava schools were examined. Dental examination was conducted according to the common methods. Caries intensity in all the children was determined by Caries Filling Extraction (CFE) Index, and CFE+cfe. To determine salivation rate the oral fluid was collected on empty stomach in the morning into sterile calibrated tubes during 5 minutes. Results and conclusions: Investigations of physical indices of the oral fluid in children of 7-9 and 10-12 years of age did not find their reliable difference considering the child’s age. Meanwhile the indices of salivation rate and oral fluid viscosity in children with caries and without it were found to differ much. That is, the course of carious process in children is associated with reduced salivation rate and increased index of the oral fluid viscosity, which in its turn deteriorates hygienic state of the oral cavity enabling to activate the activity of dental deposit microflora and its effect on enamel demineralization followed by occurrence of carious defect of temporary and especially permanent teeth recently erupted and poorly mineralized. The results obtained were calculated by variation statistics method. The indices were considered to be reliable with р≤0,05.

scholarly journals GENERAL FEATURES OF CARIES PATHOGENESIS IN THIRD MOLARS AND AUTOIMMUNE DISEASES

2020 ◽  
Vol 20 (3) ◽  
pp. 211-216
Author(s):  
R. V. Talash
Keyword(s):  
Autoimmune Diseases ◽  
Pathogenic Bacteria ◽  
Third Molars ◽  
Initial Manifestation ◽  
Dental Tissues ◽  
Tissue Degeneration ◽  
Autoimmune Pathology ◽  
Carious Process ◽  
Hard Dental Tissues ◽  
Initial Source

This article presents a literature review, the results of the analysis of random samples of third molars removed for various clinical indications (11 samples). The teeth samples were analyzed visually, then their coronal parts were treated with epoxy plastination technique and prepared polished sections were studied microscopically. The analyzed data demonstrate the pathogenesis of fissure caries in our samples studied can be explained in terms of the direct virulent effect of pathogenic bacteria on the organic matter in the superficial dentin and basal enamel with the formation of auto antigens, which, as a result of sensitization of the local immune system, become the initial source of the carious process spreading to other teeth. This gives grounds to identify it with the pathogenesis of autoimmune pathology. It has been established that carious damage to hard tissues on the smooth surfaces of the dental crown begins with the pulp, when it is vital, and stops as a result of its tissue degeneration. It has been shown that a single latent damage to the hard dental tissues is the initial manifestation of the latent stage of the carious process, while multiple defects indicate its further progression. As for the generally accepted classification of caries, according to which superficial, medium and deep caries are distinguished, then, in our opinion, they should be considered as stages of the further process of carious destruction of hard dental tissues. We can suggest the study of the pathogenesis of carious lesions of third molars is necessary in order to prevent the occurrence of autoimmune diseases and increase the effectiveness of their treatment.

Scanning Electron Microscopy and X-Ray Analyses of Dental Tissues from a Hibernator

1976 ◽  
Vol 34 ◽  
pp. 178-179
Author(s):  
M. L. Zimny ◽  
A. C. Haller
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Body Temperature ◽  
Ground Squirrel ◽  
Alveolar Bone ◽  
X Ray ◽  
Dental Tissues ◽  
Bone Minerals ◽  
Apical Tooth ◽  
Scanning Electron

During hibernation the ground squirrel is immobile, body temperature reduced and metabolism depressed. Hibernation has been shown to affect dental tissues varying degrees, although not much work has been done in this area. In limited studies, it has been shown that hibernation results in (1) mobilization of bone minerals; (2) deficient dentinogenesis and degeneration of alveolar bone; (3) presence of calculus and tears in the cementum; and (4) aggrevation of caries and pulpal and apical tooth abscesses. The purpose of this investigation was to study the effects of hibernation on dental tissues employing scanning electron microscopy (SEM) and related x-ray analyses.

scholarly journals Estimation of Wear Resistance for Multilayer Coatings Obtained by Nitrogenchroming

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1153
Author(s):  
Ivan Pavlenko ◽  
Jozef Zajac ◽  
Nadiia Kharchenko ◽  
Ján Duplák ◽  
Vitalii Ivanov ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Spectral Analysis ◽  
Friction Coefficient ◽  
Cutting Tools ◽  
Wear Intensity ◽  
Maximum Amount ◽  
Multilayer Coatings ◽  
Wear Depth ◽  
X Ray ◽  
Machine Parts

This article deals with improving the wear resistance of multilayer coatings as a fundamental problem in metal surface treatment, strengthening elements of cutting tools, and ensuring the reliability of machine parts. It aims to evaluate the wear depth for multilayer coatings by the mass loss distribution in layers. The article’s primary purpose is to develop a mathematical method for assessing the value of wear for multilayer steel-based coatings. The study material is a multilayer coating applied to steel DIN C80W1. The research was performed using up-to-date laboratory equipment. Nitrogenchroming has been realized under overpressure in two successive stages: nitriding for 36 h at temperature 540 °C and chromizing during 4 h at temperature 1050 °C. The complex analysis included several options: X-ray phase analysis, local micro-X-ray spectral analysis, durometric analysis, and determination of wear resistance. These analyses showed that after nitrogenchroming, the three-layer protective coating from Cr23C6, Cr7C3, and Cr2N was formed on the steel surface. Spectral analysis indicated that the maximum amount of chromium 92.2% is in the first layer from Cr23C6. The maximum amount of carbon 8.9% characterizes the layer from Cr7C3. Nitrogen is concentrated mainly in the Cr2N layer, and its maximum amount is 9.4%. Additionally, it was determined that the minimum wear is typical for steel DIN C80W1 after nitrogenchroming. The weight loss of steel samples by 25 mg was obtained. This value differs by 3.6% from the results evaluated analytically using the developed mathematical model of wear of multilayer coatings after complex metallization of steel DIN C80W1. As a result, the impact of the loading mode on the wear intensity of steel was established. As the loading time increases, the friction coefficient of the coated samples decreases. Among the studied samples, plates from steel DIN C80W1 have the lowest friction coefficient after nitrogenchroming. Additionally, a linear dependence of the mass losses on the wearing time was obtained for carbide and nitride coatings. Finally, an increase in loading time leads to an increase in the wear intensity of steels after nitrogenchroming. The achieved scientific results are applicable in developing methods of chemical-thermal treatment, improving the wear resistance of multilayer coatings, and strengthening highly loaded machine parts and cutting tools.

scholarly journals Hard Dental Tissues Regeneration—Approaches and Challenges

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2558
Author(s):  
Mihaela Olaru ◽  
Liliana Sachelarie ◽  
Gabriela Calin
Keyword(s):  
Tissue Engineering ◽  
Stem Cells ◽  
Stem Cell ◽  
Growth Factors ◽  
Present Review ◽  
Modern Concept ◽  
Dental Tissues ◽  
Tissue Engineering Approach ◽  
Hard Dental Tissues ◽  
Review Reports

With the development of the modern concept of tissue engineering approach and the discovery of the potential of stem cells in dentistry, the regeneration of hard dental tissues has become a reality and a priority of modern dentistry. The present review reports the recent advances on stem-cell based regeneration strategies for hard dental tissues and analyze the feasibility of stem cells and of growth factors in scaffolds-based or scaffold-free approaches in inducing the regeneration of either the whole tooth or only of its component structures.

scholarly journals Spectral analysis of x-ray emission created by intense laser irradiation of copper materialsa)

2012 ◽  
Vol 83 (10) ◽  
pp. 10E114 ◽  
Author(s):  
C. M. Huntington ◽  
C. C. Kuranz ◽  
G. Malamud ◽  
R. P. Drake ◽  
H.-S. Park ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Laser Irradiation ◽  
Intense Laser ◽  
X Ray

scholarly journals Soft X-ray absorption spectra in the CK region of carbon black and spectral analysis using the discrete variational Xα method

TANSO ◽  
2009 ◽  
Vol 2009 (236) ◽  
pp. 2-8 ◽  
Author(s):  
Yasuji Muramatsu ◽  
Ryusuke Harada ◽  
Muneyuki Motoyama ◽  
Eric M. Gullikson
Keyword(s):  
Spectral Analysis ◽  
Carbon Black ◽  
Absorption Spectra ◽  
X Ray ◽  
X Ray Absorption
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