scholarly journals Peróxido de Hidrógeno al 35% y su efecto sobre la microdureza dental

2020 ◽  
pp. 1-4
Author(s):  
Evelyn Guadalupe Torres-Capetillo ◽  
Guadalupe Rosalía Capetillo-Hernández ◽  
Mariana Gabriela Lecourtois-Amézquita ◽  
Leticia Tiburcio-Morteo
Keyword(s):  
Hydrogen Peroxide ◽  
Contact Time ◽  
Vickers Microhardness ◽  
Descriptive Study ◽  
Acid Etching ◽  
Micro Hardness ◽  
Tooth Whitening ◽  
Unit Of Measurement

Peroxides are currently the most widely used products for tooth whitening, when peroxide decomposes it produces a decrease in the pH in the medium in which it is found, immediately in the enamel produces acid etching that varies depending on the pH of the product, contact time and concentration. Objectives: To know the effect of hydrogen peroxide at 35% on dental microhardness. Methodology: Experimental, transversal, descriptive study. Using 50 teeth that were cut 1 mm below the amelocemental junction to create two vestibular and palatal faces. The teeth were lightened with 35% hydrogen peroxide to find out how much micro-hardness the enamel loses, the Vickers unit of measurement. The microhardness was measured after making 3 indentations in different surfaces of the enamel at a force of 50 grams and a time of 20 seconds with a diamond tip that left a trace observed under the microscope in the form of a pyramidal diamond; based on the vertical and horizontal diagonals, the Vickers microhardness was determined. Contribution: According to the results obtained, we found that the application of 35% hydrogen peroxide decreased dental microhardness by 25.08%.

Vital Bleaching with Whitening Strips: Summary of Clinical Research on Effectiveness and Tolerability

2001 ◽  
Vol 2 (3) ◽  
pp. 28-42 ◽  
Author(s):  
Robert W. Gerlach ◽  
Xiaojie Zhou
Keyword(s):  
Hydrogen Peroxide ◽  
Clinical Research ◽  
Contact Time ◽  
Delivery Systems ◽  
Ease Of Use ◽  
Tooth Whitening ◽  
Over The Counter ◽  
Peroxide Bleaching ◽  
Dental Practices ◽  
Dental Professionals

Abstract Rapid innovation in vital bleaching has increased the popularity of tooth whitening among dental professionals and patients. A broad range of peroxide-based treatments are currently available including those that are professionally-administered (in-office), professionally-dispensed (custom-tray-based systems), and self-directed (over-the-counter). Recently, a novel, flexible polyethylene bleaching strip was introduced that delivers a hydrogen peroxide bleaching gel to the anterior dentition. This “trayless” system, available in professional-strength and over-the-counter versions, reportedly offers advantages with respect to overall peroxide dose, contact time, and ease-of-use compared to other delivery systems. This paper reviews the relevant published clinical research on whitening strips tested among a broad range of patients commonly encountered in contemporary dental practices. Citation Gerlach RW, Zhou X. Vital Bleaching with Whitening Strips: Summary of Clinical Research on Effectiveness and Tolerability. J Contemp Dent Pract 2001;(2)3: 001-016.

Control of 2-Methylisoborneol and Geosmin by Ozone and Peroxone: A Pilot Study

1992 ◽  
Vol 25 (2) ◽  
pp. 291-298 ◽  
Author(s):  
B. Koch ◽  
J. T. Gramith ◽  
M. S. Dale ◽  
D. W. Ferguson
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Contact Time ◽  
Pilot Scale ◽  
Ozone Dose ◽  
Ammonia Addition ◽  
Removal Efficiencies ◽  
Odorous Compounds ◽  
Water District ◽  
Percent Removal

A pilot-scale study of ozone and PEROXONE (ozone in combination with hydrogen peroxide) for the removal of the odorous compounds 2-methylisoborneol (MIB) and geosmin in drinking water has been conducted at the Metropolitan Water District of Southern California. The study investigated the effects of ozone dosage, ratio of hydrogen peroxide to ozone (H202/03), and contact time. It was found that MIB and geosmin removal increased with higher applied ozone doses, but longer contact times over the range of 6-12 min were not significant. It was determined that 80-90 percent removal could be achieved with an ozone dose of approximately 4.0 mg/l, as compared to an ozone dose of approximately 2.0 mg/l at a H202/03 ratio of 0.2. Also investigated were the effects of alternative contactor configurations, ferrous sulfate as an alternative coagulant, bromide and ammonia addition, and simulated turbidity on the removal efficiencies of the two odorous compounds.

scholarly journals The remineralization potential of cocoa (Theobroma cacao) bean extract to increase the enamel micro hardness

2017 ◽  
Vol 29 (2) ◽  
Author(s):  
Sulistianingsih S. ◽  
Irmaleny I. ◽  
Opik Taofik Hidayat
Keyword(s):  
Theobroma Cacao ◽  
Vickers Microhardness ◽  
Tooth Enamel ◽  
Cocoa Bean ◽  
Natural Material ◽  
Micro Hardness ◽  
Synthetic Material ◽  
Fluorine Substitution ◽  
Average Value ◽  
Mineral Deposition

Introduction: Remineralization is the process of returning mineral ions into a hydroxyapatite structure characterized by mineral deposition on the enamel surface. The presence of mineral deposition would affect the microhardness of tooth enamel. Fluorine, as the remineralization agent is known with side effects such as fluorosis. Cocoa bean extract contains theobromine that can be used as an alternative remineralization ingredients. The objectives were to determine enamel microhardness after remineralization using cocoa bean extract as natural material and to compare with fluorine as synthetic material. Methods: Thirty-six maxillary first premolar tooth crowns was cut and planted in the epoxy resin. Teeth were then immersed in demineralization solution at pH 4 for 6 hours. The sample were divided into 2 groups, 18 for the fluorine group and the remaining group of cocoa extract. Vickers microhardness test was used before treatment, both after demineralized and remineralized. Results: The value of enamel microhardness before treatment in the fluorine group was 376.17 VHN as average value and the cocoa extract group was 357.33 VHN. After demineralization in fluorine group was 268.13 VHN and cocoa extract group was 235.93 VHN. After remineralization in fluorine group and cocoa extract group, respectively, 321.08 VHN and 293.86 VHN. The results of the analysis revealed that the level of enamel microhardness after remineralization was not significantly different in both groups (p>0.05). Conclusions: The findings indicated the ability of cocoa extract to increase the microhardness of enamel and implies the potential as a fluorine substitution for remineralization.

scholarly journals Decomposition of Cyanide from Gold Leaching Tailingsby Using Sodium Metabisulphite and Hydrogen Peroxide

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Dongzhuang Hou ◽  
Lang Liu ◽  
Qixing Yang ◽  
Bo Zhang ◽  
Huafu Qiu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Comparative Study ◽  
Contact Time ◽  
Synergetic Effect ◽  
Economic Conditions ◽  
Gold Mine ◽  
Optimal Conditions ◽  
Gold Leaching ◽  
Sodium Metabisulphite ◽  
To Come

Cyanidation is widely used by most gold mine worldwide and will remain prevail in years (or decades) to come, while cyanide is hazardous, toxic pollutants whose presence in wastewater and tailings can seriously affect human and its environment; hence, it is necessary to control these contaminants. The purpose of this study was to examine the effects through the investigation of changes in pH, concentration, and contact time, and the optimal conditions were obtained. It has been proven that the decomposition of cyanide in solution and tailings increased as the alkalinity in the presence of 0.5 g/L Na2S2O5. An increase in H2O2 (30%) concentration (from 1 to 4 mL/L) increased the decomposition in solution, while the effect on removing cyanide was better when pH was 9 than 8 and 10 in tailings. The cyanide in tailings decreased in the first 4 h and increased after 4 h. The effective and economic conditions for maximum decomposition of cyanide from leach tailings are first treated in 0.5 g/L Na2S2O5 at pH 10 for 3 hours and then 2 mL/L H2O2 (30%) is added to the tailings at pH 9 for 4 hours through comparative study. The findings provide the basis to optimize the decomposition of cyanide from gold leaching tailings in mining or backfilling by using the synergetic effect of Na2S2O5 and H2O2.

Tacoma controls tastes and odours with ozone

2007 ◽  
Vol 55 (5) ◽  
pp. 137-144 ◽  
Author(s):  
M. Carlson ◽  
T. Chen ◽  
C. McMeen ◽  
I.H. Suffet ◽  
M. Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Analytical Methods ◽  
Contact Time ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
First Order ◽  
Ozone Dose ◽  
Gorge Reservoir ◽  
Flavour Profile ◽  
As Solid Phase

The study is focussed on the conditions that would provide the best ozone oxidation to decrease the taste and odour of the water from Eagle Gorge Reservoir. This study incorporated advanced analytical methods, such as solid phase microextraction (SPME) and flavour profile analyses (FPA), to evaluate the best method for improving taste and odour. The study developed first-order relationships between ozone dose and the oxidation of several taste and odour compounds. The results focussed on the importance and interactions between ozone dose, pH, hydrogen peroxide and contact time.

The effect of hydrogen peroxide concentration on the outcome of tooth whitening: an in vitro study

2004 ◽  
Vol 32 (4) ◽  
pp. 295-299 ◽  
Author(s):  
M. Sulieman ◽  
M. Addy ◽  
E. MacDonald ◽  
J.S. Rees
Keyword(s):  
Hydrogen Peroxide ◽  
In Vitro Study ◽  
Vitro Study ◽  
Tooth Whitening

scholarly journals Influence of the acid erosion associated with dental bleaching in bovine enamel: In vitro study

2021 ◽  
Vol 10 (5) ◽  
pp. e30410514754
Author(s):  
Thaís Miranda Xavier de Almeida Justi ◽  
Karla Lorene de França Leite ◽  
Laísa Inara Gracindo Lopes ◽  
Narcy Sheilla Rodrigues ◽  
João Victor Frazão Câmara ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Daily Intake ◽  
In Vitro Study ◽  
Lemon Juice ◽  
Tooth Whitening ◽  
Apple Cider ◽  
Significant Difference ◽  
Bovine Enamel ◽  
Dental Whitening

Objective: To evaluate the influence of acid erosion caused by the daily intake of lemon juice or apple cider vinegar, associated with immediate dental whitening, on bovine enamel. Materials and Methods: 30 bovine teeth were sectioned to obtain enamel blocks and were distributed into three groups (n = 10): G1- Tooth whitening with 35% hydrogen peroxide; G2- Tooth whitening with 35% hydrogen peroxide + lemon juice and G3 - Tooth whitening with 35% hydrogen peroxide + apple cider vinegar. Treatments were performed for 21 days, the varnish was removed and the analysis of loss of structure and surface roughness were performed by means of non-contact 3D Confocal Chromatic Profilometer. The roughness data obtained were analyzed by Kruskal-Wallis and Mann-Whitney non-parametric tests. Results: All groups exhibited greater roughness (Sa) on the side exposed to the treatments (G1 = 3.17b; G2 = 4.17b; G3 = 3.99b) compared to the unexposed side (G1 = 2.55a; G2 = 3.94a; G3 = 2.40a). There was a statistically significant difference among the groups evaluated, being G1 (3.17A) <G3 (3.99C) <G2 (4.17B). Conclusion: 35% hydrogen peroxide has the least erosive potential when compared to its association with vinegar and to lemon juice.

scholarly journals Tooth whitening effects of manicure-type hydrogen peroxide tooth whitening gel

2019 ◽  
Vol 43 (4) ◽  
pp. 191
Author(s):  
Yong-Gwan Kim ◽  
Ji-Hyeon Park ◽  
Ja-Won Cho
Keyword(s):  
Hydrogen Peroxide ◽  
Tooth Whitening
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