bleaching agents to improve whiteness in minerals

Process for bleaching and increasing the ion-exchange ...

The present invention refers to a process for bleaching and increasing the ion-exchange capability of the sepiolite mineral, basically consisting of treating, at high pH and temperature, the sepiolite with a basic salt solution, which results in bleaching the starting material by dissolution of the organic material present in it, and in increasing the ion-exchange capability by a structural ...

The Effects of Seven Carbamide Peroxide Bleaching Agents ...

Background: Different concentrations of carbamide peroxide (10 to 22 percent) have been used successfully as bleaching agents, but the adverse effects on enamel microhardness at different times are unknown. Methods: The authors analyzed seven bleaching agents and a placebo. The agents were applied on the surface of human dental fragments for eight hours per day for 42 days and stored in …

Influence of bleaching and desensitizing gel on bond ...

to control mineral loss in enamel submitted to different bleaching treatments.18 Studies have reported increase in resin bond strength to enamel submitted to bleaching.19,20 The application of bleaching agents may also cause surface porosities that change enamel permeability and interfere in bond strength in bracket bonding.21 There is some ...

Efficiency of tooth bleaching agent on staining and ...

tooth bleaching agent in a liquid form with carbamide peroxide serving as the main bleaching component, and limonene and coconut diethanolamide serving as the base agents because of two reasons. One is to reduce the chemical commonly usage in the tooth bleaching agent. Two, all ingredients of our base agents are food-grade additives.

Influence of intracoronal bleaching agents on the bond ...

Aug 09, 2021· The objective of the present in vitro study was to evaluate micro-tensile bond strength (µSBS) of MTA cements to composite resin using a universal adhesive after internal bleaching procedure, and to examine surface characteristics of MTA cements exposed to bleaching agents. MTA specimens were divided into three subgroups according to the bleaching agent used which were, …

operative - whitening Flashcards | Quizlet

for WSL, the application of _____ promoted mineral gain in the subsurface body lesion. CPP-ACP T/F: bleaching tx for WSL can be recommended as a noninvasive esthetic tx regiment with supplementary remineralization protocols.

Textile Mirror: Types of Textile Bleaching agent

Aug 14, 2015· The chemical agents which remove coloring material from textile materials by oxidizing reaction and make the material pure white and bright and to increase absorbency power is called oxidizing bleaching agent. Ex: O 3, Ca(OCl)Cl, H 2 O 2, NaOCl, Ca(OCl) 2, K 2 Cr 2 O 7 etc.

Optimization of Bleaching Process - AOCS

Bleaching clay base minerals. Bentonite minerals have limited sorptive properties in the natural state and require chemical treatment by acids to create the surface area and porosity needed for bleaching vegetable oils. Bleaching clays of this nature are commonly referred to as "acid" or "acid-activated" clays.

Bleaching: Extra-White Teeth - By Dr. Priti A Kumar | Lybrate

In-House Bleaching: This will require multiple visits to the dentist, usually about 1 to 3, of about 30 to 90 minutes each. The gums are first protected and then the bleaching agent is applied. It could require laser for activation in some cases. If the desired color is not achieved, it could be followed by a couple of applications at home.

Polymers | Free Full-Text | Color Stability and Staining ...

This study evaluated color stability and staining susceptibility of five direct resin-based composites (RBCs) subjected to light-activated in-office bleaching with 40% hydrogen peroxide (HP). The test materials included 5 RBCs, which consisted of one nano-filled, one sub-micron, one bulk-filled, and two nano-hybrid RBC types. Ten disc-shaped specimens of each RBC were fabricated and divided ...

Bleaching Agents To Improve Whiteness In Minerals

bleaching agents to improve whiteness in minerals . Skin whitening agents are help to improve texture of skin essential nutrients like vitamins and minerals aur foot,aur face ko kis tarha sa jaldi white Tooth Whitening, Teeth Bleaching due to changes in the mineral fabricate custom fitted whitening trays that will greatly improve . Get Price

Suitable Bleaching Agents for Talc - Hydrometallurgy ...

Robert, the bleaching/leaching would be to increase the whiteness of the talc. Currently, the talc is considered to be white or maybe "off-white" in color and my aim is to get it to "brilliant white". Now, these colors should be quantified on a scale (e.g., Hunter) but unfortunately the clients in this part of the world simply use the eye test.

Flour Bleaching | Baking Processes | BAKERpedia

Flour bleaching is a chemical treatment that removes yellow xanthophyll and other pigments from milled grains to produce whiter, finer-grain flour suitable for high ratio cakes, cookies and quick breads. Some bleaching agents can also help in "aging" flours, improving their functionality.

Effects of experimental bleaching agents on the mineral ...

Therefore, the second hypothesis was rejected, as the addition of Ca or F to the 35% HP bleaching agent was unable to increase mineral concentration of enamel subsurface. Based on the exposed, the addition of F and Ca to the 35% HP agent could keep and increase the mineral content of enamel surface for both sound and demineralized substrates ...

Preheat-Treatment and Bleaching Agents Affect ...

Sep 09, 2020· Highest whiteness index (92.26 ± 0.21) was observed for bio-calcium from autoclaved bone. Using H 2 O 2 alone as bleaching agent produced lighter and whiter color than combined bleaching agents (sodium hypochlorite and hydrogen peroxide). Ca-hydroxyapatite was found in both bio-calcium confirmed by FTIR, but slightly higher amount was found in ...

Association of in-office and supervisoned in-office ...

For example, both bleaching agents chosen for this case report, Opalescence® Boost and Opalescence® Quick PF 45%, have in their composition the presence of fluoride and potassium nitrate. Mineral loss that happens during the dental bleaching can be attributed to saturation of the bleaching gel, even though it has a neutral pH [12].

(PDF) Bleaching efficacy of whitening agents activated by ...

L* tion font.4 The use of coherent light to improve the bleaching is the luminosity dimension or whiteness, ranging from 0 (pure effect is quite new, it was first described by D. Yarborough5 black) to 100 (reference white) and it is proportional to the 1Centro de Lasers e Aplicaçôes, IPEN/SP, University of São Paulo, São Paulo, Brazil.

EP1146089A1 - Methods for bleaching kaolin clay and other ...

Improved methods for bleaching kaolin clay and other minerals are provided. More particularly, methods of the present invention employ a hydrosulfite or bisulfite material and a second reducing agent, preferably a reducing agent that contains a Group III element, such as a borohydride, to increase the brightness of kaolin clay and other minerals and reduce color present therein.

Susceptibility of Enamel Treated with Bleaching Agents to ...

Aug 01, 2011· Objectives . Controversial reports exist whether bleaching agents cause a susceptibility to demineralization. The aim of this study was to compare the calcium loss of enamel treated with different bleaching agents and activation methods. Method and Materials . The specimens obtained from human premolars were treated in accordance with manufacturer protocols; 10% carbamide …

(PDF) Effects of Combined Use of Light Irradiation and 35% ...

The null hypothesis tested was that the bleaching agents were used in a single session: Whiteness HP enamel mineral content is not influenced by the type of Maxx (FGM Produtos Odontolo´gicos, Joinville, SC, Brazil), bleaching gel and the light irradiation of the bleaching Pola Office (Southern Dental Industries, Bayswater, Victoria, agents ...

Susceptibility of Enamel Treated with Bleaching Agents to ...

Aug 01, 2011· Tezel et al. researched the effects of different bleaching agents with different concentrations on Ca 2+ loss from enamel. It has been concluded that higher concentrations of HP resolve more Ca 2+ from the enamel surface. Thus, more changes may occur on enamel structure as the concentrations of bleaching agent increase.

A Novel Tooth Bleaching Gel Based on Peroxymonosulfate ...

Sep 20, 2021· A bleaching agent could be regarded as efficient if it produces a whiteness variation above the threshold of acceptability (WAT=2.62 WI D units), .In order to objectively reflect whitening effect of PMS gel, we selected commonly used 38%HP gel (Opalescent Boost, Ultradent, South Jordan, USA) in clinical practice for a series of comparisons.

E ect of Tooth Whitening (Bleaching) Agent on Dentin ...

7 E!ect of Tooth Whitening (Bleaching) Agent on Dentin Microhardness H. Miray UYAN1 Sema YILDIRIM2 Abstract Objectives: The aim of this study is to investigate the effect of whitening agents on dentin micro hardness. Materials and methods: 60-incisor maxillary (20 per group) tooth were applied root chanel treatment: one is control group and the others are applied to whitening products namely ...

Physical Refining – Bleaching | Oil Palm Knowledge Base

Dec 26, 2015· Physical Refining – Bleaching. Bleaching was introduced in edible oil refining at the end of the 19 th century to improve the colour of cottonseed oil. Originally, it was a batch process at atmospheric pressure, in which natural bleaching clay was added to hot oil with the sole objective of removing colouring pigments.

Preheat-Treatment and Bleaching Agents Affect ...

10%· Sep 09, 2020· Highest whiteness index (92.26 ± 0.21) was observed for bio-calcium from autoclaved bone. Using H 2 O 2 alone as bleaching agent produced lighter and whiter color than combined bleaching agents (sodium hypochlorite and hydrogen peroxide). Ca-hydroxyapatite was found in both bio-calcium confirmed by FTIR, but slightly higher amount was found in ...

How do flour mills bleach flour? - Quora

Answer (1 of 2): Bleaching is literally making the flour 'whiter' by removing the yellow pigments in it. It is achieved by adding Benzoyl Peroxide, or bromate in a powder form and left to rest for two days for reaction to take effect. This has no effect on baking performance though. It is also do...

Effects of experimental bleaching agents on the mineral ...

Effects of experimental bleaching agents on the mineral content of ... in vitro studies have demonstrated increase ... peroxide agent (Whiteness HP Maxx – FGM Dental Products, Joinville, SC ...

Removing Polysaccharides-And Saccharides-Related Coloring ...

If too much amount of NaHCO3 was added to the system and maintained alkaline pH, the bleaching effect would be greatly reduced. Fixing molar ratio of TAED to H2O2 and increasing the amount of H2O2 were beneficial to improve the whiteness of alkyl polyglycosides, but adding too much amount of H2O2 would reduce the transparency.

Effect of Optical Brightening Agent (OBA) on Bleaching ...

significant. Based on the curves shown in Figure 3, established regression equations presented in Table 3 were established, where whiteness is correlated with the pulp bleached brightness and the dosage of optical brightener applied. As shown in Table 3, OBA can improve significantly the optical properties of pulps of 88%, 90% and 92% ISO.With 2 kg/t OBA (Tinopal EC (S) Liq.) and a brightness ...

Elemental and morphological analysis of enamel following ...

Mar 25, 2021· Using remineralizing agents during and after bleaching procedures could maintain enamel surface, decreasing its erosive susceptibility. This study evaluated the efficacy of an in-office and at-home bleaching materials with amorphous calcium phosphate (ACP) on the susceptibility of the enamel to erosion. Forty-five bovine specimens were separated into three groups.

Papermaking - Bleaching and washing | Britannica

Papermaking - Papermaking - Bleaching and washing: The use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century. In the early days of sulfite pulp manufacture, a single-stage treatment of pulp at low consistency, using calcium hypochlorite (chlorinated lime), satisfied most requirements. This simple bleaching treatment, however, is not ...

Process for bleaching and increasing the ion-exchange ...

4. A process for bleaching and increasing the ion exchange capability of sepiolite, according to claim 3, characterized in that said obtained product is submitted to an additional bleaching treatment with an aqueous solution of a reducing agent capable of reducing the Fe 3 + impurities of the clay into Fe 2 +. 5.

Pre-treatment of cotton fabric - Hand

Sep 28, 2021· To improve brightness of colour after dyeing or ; Further improvement of whiteness by treatment with optical brightening agents when the fabric is to be marketed as white; Bleaching agents. The chemicals used for improving the whiteness of …

Bleaching agents. Medical search. Frequent questions

bleaching agents. Frequent questions. Medical Information Search. Analytical, Diagnostic and Therapeutic Techniques and Equipment 3

Whiteness - an overview | ScienceDirect Topics

In general, the use of whiteness indices in the dental field is limited to only a few examples in the literature. Garcia et al. (1993) reported that the WIC was the best index for describing the whiteness of a group of 20 samples of porcelain teeth in vitro.More recently, Guan et al. (2005) used the WIC to determine the increase of whiteness of extracted teeth following a bleaching procedure ...

bleaching agents to improve whiteness in minerals

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