scholarly journals Structural Changes on Human Dental Enamel Treated with Er:YAG, CO2 Lasers and Remineralizing Solution: EDS Analysis

10.5772/28867 ◽  
2012 ◽  
Author(s):  
Rosala Contreras-Bulnes ◽  
Oscar Fernando ◽  
Laura Emma ◽  
Rogelio Jos ◽  
Claudia Centeno-Pedraz
Keyword(s):  
Structural Changes ◽  
Dental Enamel ◽  
Co2 Lasers ◽  
Eds Analysis

scholarly journals Application of Micro-Raman Spectroscopy for the Quantitative Analysis of Vitrinite Reflectance in Medium and High Rank Colombian Coals

2020 ◽  
Vol 29 (54) ◽  
pp. e12241
Author(s):  
Ruben Dario Urbano-Noguera ◽  
Hugo Armando Estupiñan-Duran ◽  
Gustavo Neira-Arenas
Keyword(s):  
Structural Changes ◽  
Vitrinite Reflectance ◽  
Sem Analysis ◽  
Morphological Description ◽  
Total Width ◽  
Modified Method ◽  
Eds Analysis ◽  
Fitting Method ◽  
Degree Of Maturity ◽  
Curve Fitting Method

The structural changes and the degree of maturity of three Colombian coals from the Santander and Antioquia provinces were studied using a simple and fast curve fitting method of the RBS parameters (the distance between band G and band D), FWHM - G (total width at half the maximum of the G band) and AR (area of the Raman spectrum), obtained by deconvolution and band resolution of the Micro-Raman spectra. The results were compared by morphological and chemical analysis using a SEM scanning electron microscope coupled with a solid state X - ray EDS detector. A percentage of vitrinite reflectance (% Ro) of 4.3 %, 3.8 % and 0.07 % was obtained, a percentage of carbon by EDS analysis of 91.47 %, 87.78 %, 73.4 %, a morphological description by SEM analysis presenting smooth, rough surfaces and rough-lumpy and pore size between 0.7 µm - 0.8 µm, 1.3 µm - 1.5 µm and 0.2 µm - 0.7 µm for the anthracite, semi-anthracite and bituminous samples, respectively. The results showed that based on this method, it was possible to obtain a model that allows to rapidly analyze and characterize the coal. The results compare very well to those of Colombian coals normalized by other methods to improve the precision of the measurement. The modified method, however, did not offer an appropriate fit for the lower range coal and produced extremely low reflectance values. This effect is possibly related with the molecular structure of organic matter in coal or the presence of fluorescence interference. 

scholarly journals Morphological and Structural Changes on Human Dental Enamel After Er:YAG Laser Irradiation: AFM, SEM, and EDS Evaluation

2011 ◽  
Vol 29 (7) ◽  
pp. 493-500 ◽  
Author(s):  
Laura Emma Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Oscar Fernando Olea-Mejìa ◽  
Ignacio Sánchez-Flores ◽  
Claudia Centeno-Pedraza
Keyword(s):  
Laser Irradiation ◽  
Structural Changes ◽  
Er:Yag Laser ◽  
Dental Enamel

scholarly journals Surface Morphological Changes and Predisposition to Staining in Dental Enamel Bleached with Different Hydrogen Peroxide Concentrations

2021 ◽  
Vol 15 (1) ◽  
pp. 558-568
Author(s):  
Douglas Magno Guimarães ◽  
Brennda Lucy Freitas de Paula ◽  
Luciane Margalho Rodrigues ◽  
Hilton Túlio Costi ◽  
Hervé Louis Ghislain Rogez ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Light Source ◽  
Structural Changes ◽  
Light Emission ◽  
Morphological Changes ◽  
Dental Enamel ◽  
Tooth Bleaching ◽  
Morphological Alterations ◽  
High Concentrations ◽  
Bovine Enamel

Background: The tooth bleaching treatment can cause structural changes in the surfaces of the teeth; these changes can increase the absorption of staining agents. Purpose: This study assessed surface morphological changes and predisposition to staining in dental enamel bleached with different hydrogen peroxide (HP) concentrations, with or without the use of a light source (LS). Methods: 25 bovine incisor specimens were divided into five groups (n = 5): Control- no treatment; HP35 - hydrogen peroxide 35%; HP35+LED - hydrogen peroxide 35% + light emission; HP20 - hydrogen peroxide 20%; and HP7 - hydrogen peroxide 7,5%. Twenty days after bleaching, the specimens were immersed in staining solutions four hours a day for 28 days. The morphological alterations of the bovine enamel surface were evaluated by means of scanning electron microscopy, X-ray dispersive energy spectroscopy and predisposition to the staining of the brightened enamel by means of colorimetry. Results: ANOVA with Tukey's test (p<0.05) showed that HP7 had the highest ΔL values (p=0.176) (brightest), with a better lightening effect. The bleached groups exhibited morphological changes in the enamel. The groups did not exhibit significant changes in oxygen, calcium, and phosphorus values (p=0.020). The presence or absence of light was not significant (p=0.007) for the predisposition to staining in bleached teeth. Conclusion: The time of exposure to the staining solution was significant for staining bovine dental enamel. High concentrations of HP were not necessary for achieving effective bleaching. HP caused an increase in enamel porosity and depressions. The light source did not influence bleaching.

scholarly journals Molecular Fingerprint Imaging to Identify Dental Caries Using Raman Spectroscopy

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4900
Author(s):  
Nao Miyamoto ◽  
Tetsuya Adachi ◽  
Francesco Boschetto ◽  
Matteo Zanocco ◽  
Toshiro Yamamoto ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Dental Caries ◽  
Tooth Loss ◽  
Quantitative Methods ◽  
Structural Changes ◽  
Dental Enamel ◽  
Subjective Assessment ◽  
Bone Fragility ◽  
Caries Detection ◽  
Molecular Fingerprint

Tooth loss impairs mastication, deglutition and esthetics and affects systemic health through nutritional deficiency, weight loss, muscle weakness, delayed wound healing, and bone fragility. Approximately 90% of tooth loss is due to dental caries and periodontal disease. Accordingly, early treatment of dental caries is essential to maintaining quality of life. To date, the clinical diagnosis of dental caries has been based on each dentist’s subjective assessment, but this visual method lacks objectivity. To improve diagnostic ability, highly sensitive quantitative methods have been developed for the diagnosis and prevention of dental caries and are gradually becoming a mandatory item in modern dentistry. High-resolution Raman spectroscopy is a suitable tool for recognizing the subtle structural changes that occur in dental enamel in already developed or, more importantly, incipient dental caries. Raman analysis could soon emerge as a breakthrough in dentistry because of its high diagnostic sensitivity. In this study, we build upon our previous findings in a new analysis of dental caries using Raman spectroscopy imaging and discuss the possibility of using Raman photonic imaging in support of objective diagnostics in dentistry. Our findings support the Raman method of caries detection in comparison with other conventional or new approaches.

Structural Changes in Human Dental Enamel after Subablative Erbium Laser Irradiation and Its Potential Use for Caries Prevention

2004 ◽  
Vol 39 (1) ◽  
pp. 65-70 ◽  
Author(s):  
C. Apel ◽  
J. Meister ◽  
H. Götz ◽  
H. Duschner ◽  
N. Gutknecht
Keyword(s):  
Laser Irradiation ◽  
Structural Changes ◽  
Dental Enamel ◽  
Caries Prevention ◽  
Erbium Laser ◽  
Potential Use

Acid Resistance and Structural Changes of Human Dental Enamel Treated with Er:YAG Laser

2010 ◽  
Vol 28 (2) ◽  
pp. 207-211 ◽  
Author(s):  
Laura Emma Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Ignacio Sánchez-Flores ◽  
Enrique Cuauhtémoc Samano
Keyword(s):  
Structural Changes ◽  
Er:Yag Laser ◽  
Dental Enamel ◽  
Acid Resistance

scholarly journals Phase composition of deformable D16 and B95 aluminium alloys with the quantitative assessment of overburning of different stages of development

2020 ◽  
pp. 68-78
Author(s):  
R. A. Vorob`ev ◽  
S. A. Sorokina ◽  
V. V. Evstifeeva
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Aluminum Alloys ◽  
Oxygen Content ◽  
Structural Changes ◽  
Negative Impact ◽  
Metallographic Analysis ◽  
Monitoring Methods ◽  
Correlation Relationship ◽  
Eds Analysis

This paper covers new overburning monitoring methods for D16 and V95 aluminum alloys based on use of a method of an energydispersive X-ray spectral analysis (EDS analysis). It is known that lowered performance of aluminum-based materials is often connected with overburning in their structure. Because the structural changes caused by overburning (flash-off of eutectics and excess low-melting phases and the subsequent crystallization of melted-off microvolumes) are followed by developing porosity, have negative impact on physical and chemical, mechanical and processing properties. The ability to reveal overburning at early stages allows to reject the defective metal. Characteristics sensitive to an early overburning stage are offered based on EDS analysis. A degree of the induced overburning in a D16 sheet is identified. B95 alloy structural components determining the alloy tendency to overburning are revealed. It is found that the EDS analysis makes it possible to reveal changes in the chemical composition of the structural elements of D16 and V95 aluminum alloys and identify an overburning stage quantitatively based on oxygen content. Overburning development leads not only to the higher content of oxygen in the chemical composition of aluminum alloys, but also lowers the electrical conductivity of the material. The paper considers a correlation relationship between the D16 alloy electrical conductivity with overburning induced in it, and oxygen content. The applicability of this method is caused by the method simplicity and a possibility to quantify the defect development in the heat-strengthened deformable aluminum alloys after process heatings. Also this method can be used as an additional research method when metallographic analysis gives no definite answer at identification of early overburning stages.

scholarly journals Chemical Changes Associated with Increased Acid Resistance of Er:YAG Laser Irradiated Enamel

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jennifer Manuela Díaz-Monroy ◽  
Rosalía Contreras-Bulnes ◽  
Oscar Fernando Olea-Mejía ◽  
María Magdalena García-Fabila ◽  
Laura Emma Rodríguez-Vilchis ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Structural Changes ◽  
Er:Yag Laser ◽  
Laser Energy ◽  
Dental Enamel ◽  
Acid Resistance ◽  
Control Groups ◽  
Acid Dissolution ◽  
Chemical Changes ◽  
Group I

Background. An increase in the acid resistance of dental enamel, as well as morphological and structural changes produced by Er:YAG laser irradiation, has been reported.Purpose. To evaluate the chemical changes associated with acid resistance of enamel treated with Er:YAG laser.Methods. Forty-eight enamel samples were divided into 4 groups (n=12). Group I (control); Groups II, III, and IV were irradiated with Er:YAG at 100 mJ (12.7 J/cm2), 200 mJ (25.5 J/cm2), and 300 mJ (38.2 J/cm2), respectively.Results. There were significant differences in composition of irradiated groups (with the exception of chlorine) and in the amount of calcium released.Conclusions. Chemical changes associated with an increase in acid resistance of enamel treated with Er:YAG laser showed a clear postirradiation pattern characterized by a decrease in C at.% and an increase in O, P, and Ca at.% and no changes in Cl at.%. An increased Ca/P ratio after Er:YAG laser irradiation was associated with the use of higher laser energy densities. Chemical changes produced by acid dissolution showed a similar trend among experimental groups. Stable or increased Ca/P ratio after acid dissolution was observed in the irradiated groups, with reduction of Ca released into the acid solution.

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