Effects of a surface water film on the interaction of Er:YAG radiation with dental hard tissues in vitro

1996 ◽  
Author(s):  
David C. Attrill ◽  
Simon R. Farrar ◽  
A. S. Blinkhorn ◽  
R. M. Davies ◽  
Mark R. Dickinson ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Film ◽  
Dental Hard Tissues ◽  
Hard Tissues

Chemical Analysis of Enamel and Dentin Following the Application of Three Different At-home Bleaching Systems

2011 ◽  
Vol 36 (5) ◽  
pp. 529-536 ◽  
Author(s):  
FY Cakir ◽  
Y Korkmaz ◽  
E Firat ◽  
SS Oztas ◽  
S Gurgan
Keyword(s):  
Chemical Composition ◽  
Deleterious Effect ◽  
Energy Dispersive Spectrometer ◽  
Carbamide Peroxide ◽  
Anterior Teeth ◽  
Signed Rank ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
At Home

SUMMARY Purpose To determine the change in the chemical composition of enamel and dentin as well as to evaluate the differences in surface texture of the same dental hard tissues following three at-home bleaching systems in vitro. Methods Sixty extracted intact human anterior teeth were used in this study. Thirty teeth were used as samples for enamel, and the buccal surfaces of the remaining 30 teeth were abraded and used as dentin samples. Prior to bleaching treatments, calcium (Ca), phosphorus (P), potassium (K), sodium (Na), magnesium (Mg), fluoride (F), and oxygen (O) levels of each sample were measured using an energy dispersive spectrometer. The teeth were then randomly allocated into three groups according to the bleaching system used, as follows: GI, 10% carbamide peroxide (CP); GII, 20% CP; GIII, and 35% CP. Following the bleaching treatments, Ca, P, K, Na, Mg, F, and O measurements were repeated. The surface configurations were examined using scanning electron microscopy (SEM). The data were analyzed using Wilcoxon signed rank and Kruskal-Wallis tests followed by the Dunn test. Results All three bleaching systems tested caused similar changes in the chemical composition of enamel and dentin. Bleaching systems decreased Ca and K, while F and O levels increased in enamel. In dentin, Ca, P, and K levels decreased; however, Na, F, and O levels increased. SEM observations revealed no deleterious effect on enamel and dentin. Conclusion The use of home bleaching agents could affect the chemical composition of dental hard tissues, whereas the change in the chemical composition of enamel and dentin was not affected by the CP concentration of the bleaching systems used.

scholarly journals Effect of 940 nm Gallium Arsenide Laser on dental hard tissues temperature propagation

2015 ◽  
Vol 18 (4) ◽  
pp. 104
Author(s):  
Javier Higuera ◽  
Ariel Denis Espinoza ◽  
Sebastian Contreras Marino
Keyword(s):  
Laser Radiation ◽  
Temperature Increase ◽  
Effect Of Temperature ◽  
Extensive Literature ◽  
Major Powers ◽  
Pulsed Mode ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Lower Incisors

<p align="left"><span style="color: #212121;"><span><span>Despite the extensive literature available on laser at the present, there are few articles about the temperature of laser radiation and its propagation on dental hard tissues. The present study general objective is to evaluate </span></span></span><span style="color: #212121;"><span><span><em>in vitro</em></span></span></span><span style="color: #212121;"><span><span><span> the effect of temperature increase produced by the laser radiation of 940 nm on the dental hard tissues and, as specific objectives a) analyze current parameters using 940 nm laser on dental hard tissues b) assess the most appropriate criteria for this wavelength on dental hard tissues. 4 groups of 5 teeth each (lower incisors, upper incisors, canines and molars) were irradiated with 6 powers and frequencies (0.1 to 0.4W, in continuous or pulsed mode). The results of this study allow us to ensure that, in the chosen parameters, major powers, but delivered in pulsed manner, generate less temperature rise. Extremely significant differences were found between groups of lower incisors and molars. 0.1W power, pulsed mode for 20 msec, with 20 millisecond intervals, generated less than 4 Celsius degrees of temperature increase in all the cases studied. In conclusion, the use of powers of up to 0.4W, in pulsed mode, generated thermal effects of less than 4 Celsius degrees.</span></span></span></span></p>

The Influence of Er:YAG Laser on the Dissolution Rate and Morphology of the Root Cement A scanning electron microscopic study

2018 ◽  
Vol 69 (6) ◽  
pp. 1574-1577
Author(s):  
Monica Monea ◽  
Daniela Esian ◽  
Reka Soos ◽  
Adrian Tohati ◽  
Alexandru Sitaru ◽  
...  
Keyword(s):  
Er:Yag Laser ◽  
Electron Microscopic ◽  
Morphological Alterations ◽  
Dental Tissues ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Root Planning ◽  
Scaling And Root Planning ◽  
Scanning Electron

Lasers can interact with dental tissues inducing changes in tooth characteristics, regarding the surface morphology and elemental composition. The alterations were observed in Calcium, Phosphorus, Sodium, Oxygen and Carbon elements, which influence the resistance and chemical properties of dental hard tissues. The thermal energy used by laser reduces water content of the tissues and as a consequence, the level of oxygen composition decreases after irradiation. Numerous studies had demonstrated its ability to ablate hard-tissues, without any detrimental thermal effects such as cracking or melting for the adjacent tissues. The aim of this article is to present the in vitro effects of Er:YAG laser in comparison with sonic, ultrasonic and manual instruments on the root cement during scaling and root planning, evaluated by scanning electron microscope. The study was conducted on extracted teeth, divided in four groups according to the method used for scaling and root planning. The specimens were analyzed by scanning electron microscopy and the morphological alterations of the cement were evaluated based on a scoring system. Data were statistically analyzed using Mann-Whitney test and the level of significance was set at p[0.05.We noted unfavorable results on the root cement after using Er:YAG laser as craters and cracks induced by heat. There was a greater amount of roughness on the root surface after Er:YAG was used for scaling and root planning compared to manual, sonic and ultrasonic methods. Despite favorable results obtained after the use of Er:YAG laser during periodontal treatment, further clinical studies are necessary in order to determine in which moment of the therapy these methods are most suitable.

Relative susceptibility of deciduous and permanent dental hard tissues to erosion by a low pH fruit drink in vitro

2000 ◽  
Vol 28 (4) ◽  
pp. 265-270 ◽  
Author(s):  
M.L Hunter ◽  
N.X West ◽  
J.A Hughes ◽  
R.G Newcombe ◽  
M Addy
Keyword(s):  
Low Ph ◽  
Relative Susceptibility ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Fruit Drink

Quantifying and qualifying surface changes on dental hard tissues in vitro

2010 ◽  
Vol 38 (3) ◽  
pp. 182-190 ◽  
Author(s):  
J. Field ◽  
P. Waterhouse ◽  
M. German
Keyword(s):  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Surface Changes

Variation in the Changes Induced by Different Forms of Tobacco in Dental Hard Tissues-A SEM-EDAX Study

2011 ◽  
Vol 53 (4) ◽  
pp. 348-355
Author(s):  
Thakare Eesha ◽  
Chaudhary Minal ◽  
Gawande Madhuri ◽  
Wadhwan Vijay ◽  
Gadbail Amol
Keyword(s):  
Dental Hard Tissues ◽  
Hard Tissues

Primary Teeth and Hair as Indicators of Environmental Pollution

2016 ◽  
Vol 40 (2) ◽  
pp. 152-155 ◽  
Author(s):  
TE Shishniashvili ◽  
NN Suladze ◽  
VV Margvelashvili
Keyword(s):  
Environmental Pollution ◽  
Toxic Elements ◽  
Chemical Elements ◽  
Epidemiological Survey ◽  
Essential Elements ◽  
World Health ◽  
Dental Tissues ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Health Organization

Objectives: To study the influence of environmental pollution on the mineralization of dental hard tissues by using biosubstrates: teeth and hair. :Study design: At the first stage epidemiological survey was conducted in polluted and less polluted areas of Tbilisi (Georgia). We studied 525 children aged 3 and 4 years. Caries prevalence and intensity was defined by the methodology of World Health Organization. At the second stage the chemical elements content was studied in hair and teeth hard tissues of 24 children by X - ray fluorescent spectroscopy method. Results: The prevalence of dental caries in the polluted region was 46%, caries intensity − 1.92 (± 2.842). In the less polluted region prevalence was 37%, caries intensity − 1.47 (± 2.571). These data are statistically reliable (p &lt; 0.05). The study of hair and tooth tissues showed that the toxic elements (Pb, Hg, Sn, Ti) content in these tissues was higher in environmentally unfavorable than in favorable conditions. Conclusion: Hair and dental tissues can be used as indicators of environmental pollution. Our survey showed that toxic elements content in dental hard tissues was higher and the level of essential elements was less in polluted than in less polluted areas of Tbilisi.

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