bleaching agents to improve whiteness in minerals

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bleaching agents to improve whiteness in minerals

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bleaching agents to improve whiteness in minerals

Susceptibility of Enamel Treated with Bleaching Agents to

After removing the whitening gel, the teeth were rinsed and dried and the same topical fluoride agent (WHITEsmile after bleaching mousse, 30% xylitol, 4.2% potassium nitrate, 1450 ppm sodium fluoride, Germany) was applied for ten minutes. The specimens were kept in artificial saliva until the following day.

Effects of experimental bleaching agents on the mineral

Yet, studies have observed that home-applied bleaching agents (10% carbamide peroxide), enhanced with high concentrations of fluoride (0.2%) or calcium (0.2%) applied 6 h a day for 14 days, minimized enamel mineral loss. 7,16 Therefore, it is possible that the addition of fluoride or calcium to high-concentrated bleaching agents (35% hydrogen peroxide) could prevent mineral loss.

(PDF) Impact of remineralizing agents on enamel

Considering the mineral loss induced by the whitening agents, researches have been investigating post-bleaching therapies to reduce the adverse effects of bleaching (8). The technology Regenerate

OPTICAL BRIGHTENING AGENT — A Source of Whitener by

Dec 30, 2017· The reason for using Optical Brightening Agents is to compensate the yellowish color by improving whiteness and enhancing the brightness

Bleaching Agents Farr - Major Reference Works Wiley

Sep 19, 2003· The reducing agents generally used in bleaching include sulfur dioxide, sulfurous acid, bisulfites, sulfites, hydrosulfite (dithionites), sodium sulfoxylate formaldehyde, and sodium borohydride. These materials are used mainly in pulp and textile bleaching.

US4824653A Method of bleaching limestone Google Patents

This invention relates to a method of bleaching limestone, and more particularly to a method for removing small amounts of iron, usually in the form of iron oxide, from the limestone in order to...

Optimization of Bleaching Process

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.

(PDF) Effect of Different bleaching agents on cotton

Types of bleaching agents Oxidative Bleaching Agent  Sodium Hypochlorite (NaOCl)  Calcium Hypochlorite (Ca (OCl)2)  Hydrogen Peroxide (H2O2) etc.  Reductive Bleaching Agent  Zinc Dust (Zn)  Thiourea dioxide (CH4N2O2S)  Sodium Dithionite (Na2S2O4) etc.Oxidative bleaching agent Sodium hypochlorite is a chemical compound with the formula NaClO.

An Introduction to Gem Treatments

Bleaching a chemical used to alter / reduce a component of, or the entire color, of a porous gem. Some gemstones are bleached and then dyed, a form of “combination treatment.” 1. The most commonly encountered bleached gems include: Jadeite jade Jadeite is often bleached with acid to remove an unwanted brown component from the

Whiteness an overview ScienceDirect Topics

If high whites are required, both natural and regenerated cellulose fibres may be chemically bleached and treated with a fluorescent brightening agent. 28,29 Fluorescent brightening agents are based on diaminostilbene derivatives, triazoles, aminocoumarins, and many other organic compounds and are absorbed by the fibre.

Effects of experimental bleaching agents on the mineral

calcium added to the bleaching agents will control mineral loss, even if the agent has low pH, in view of the fact that the bleaching will be saturated with ions.15,16 Yet, studies have observed that home-applied bleaching agents (10% carbamide peroxide), enhanced with high concentrations of fluoride (0.2%) or calcium (0.2%) applied 6 h a day

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

Effects of bleaching and functionalization of kaolinite on

In Fig. 9a, it can be seen that the whiteness index of kaolin was improved firstly through the bleaching treatment and then by the chemical intercalation. Precisely, the use of leaching agent exhibited a significant increase in the whiteness index of kaolinite powder from 33.09%, yielding a value of 46.97%.

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

Optimization of Bleaching Process

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.

The effects of seven carbamide peroxide bleaching agents

Oct 01, 2003· With 10, 15, 16 or 22 percent carbamide peroxide concentrations, the same esthetic results can be achieved in a shorter time, compared with the results for lower concentrations of carbamide peroxide agents, 5 even though an increase in tooth sensitivity can occur.3, 5 When other ingredients are added to the bleaching agent, as is the case for

Susceptibility of Enamel Treated with Bleaching Agents to

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 peroxide,

Evaluation of the Human Enamel Surface Morphology after

will increase by an increase of bleaching agent acidity. (9) To overcome this loss of minerals and subsequent micro-hardness by bleaching agent remineralizing solutions are recommended. There are many remineralizing agents such as fluoride, Calcium Phosphate Based Remineralization, Sugar Substitute, and Ozone. (10) The ACP

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

(PDF) Do different bleaching protocols affect the enamel

The significance of interpreting the effect of bleaching products on the enamel surface, particularly hardness, can help in administering the right dose of the bleaching agent on the vital teeth

At home vital teeth bleaching: how to optimize a safe and

Mar 16, 2021· Many authors recommend the addition of calcium and fluoride in bleaching agents to reduce enamel demineralization. However, according to Cavalli et al.’ study; even though experimental bleaching agents with calcium or fluoride reduced mineral loss, these agents were unable to reverse the enamel subsurface demineralization 26.

An Introduction to Gem Treatments

Bleaching a chemical used to alter / reduce a component of, or the entire color, of a porous gem. Some gemstones are bleached and then dyed, a form of “combination treatment.” 1. The most commonly encountered bleached gems include: Jadeite jade Jadeite is often bleached with acid to remove an unwanted brown component from the

Effect of bleaching on restorative materials and

Objective The bleaching agents may interact with restorative materials, such as dental amalgam, providing an increase mercury ions (Hg) release, whose toxic effect is known.

Color change of the bleached enamel treated with calcium

In addition, another concern is the adverse effect caused by the bleaching agent on the enamel . It is known that bleaching agents with low pH values can lead to enamel chemical composition alteration, microhardness decrease, and morphological alteration (4,5).

Effects of experimental bleaching agents on the mineral

calcium added to the bleaching agents will control mineral loss, even if the agent has low pH, in view of the fact that the bleaching will be saturated with ions.15,16 Yet, studies have observed that home-applied bleaching agents (10% carbamide peroxide), enhanced with high concentrations of fluoride (0.2%) or calcium (0.2%) applied 6 h a day

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

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

Susceptibility of Enamel Treated with Bleaching Agents to

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 peroxide,

PT Dunia Kimia Jaya Bleaching

This product is also very effective in bleaching recycled pulp because its strong reducing properties. DEKABRIGHT BS-35 is a decoloring/bleaching agent composed with chlorine free-inorganic reductant which shows the decoloring effect to the direct, acid dyes and pigments consist of the azo and diazo groups as the chromophore in the recycled

Color change of the bleached enamel treated with calcium

In addition, another concern is the adverse effect caused by the bleaching agent on the enamel . It is known that bleaching agents with low pH values can lead to enamel chemical composition alteration, microhardness decrease, and morphological alteration (4,5).

Effect of bleaching on restorative materials and

Objective The bleaching agents may interact with restorative materials, such as dental amalgam, providing an increase mercury ions (Hg) release, whose toxic effect is known.

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.

titanium dioxide Description & Uses Britannica

Titanium dioxide, a white, opaque, naturally occurring mineral existing in a number of crystalline forms, the most important of which are rutile and anatase. These naturally occurring oxide forms can be mined and serve as a source for commercial titanium. Titanium dioxide is odorless and absorbent.

(PDF) Do different bleaching protocols affect the enamel

The significance of interpreting the effect of bleaching products on the enamel surface, particularly hardness, can help in administering the right dose of the bleaching agent on the vital teeth

Effect of bleaching agents having a neutral pH on the

Aim: To investigate the effect of bleaching agents having a neutral pH on the surface of mineral trioxide aggregate (MTA) used as a coronal seal material for nonvital bleaching, beneath the bleaching agent, with the help of energy dispersive X-ray microanalysis and scanning electron microscopy (SEM). Materials and Methods: Six samples of plastic tubes filled with white MTA (Angelus white) were

Comparative evaluation of two different remineralizing

, Hydrogen peroxide causes the release of free radicals, and the effect can be intensified by a reduction in pH of the bleaching agents, thus changing the microhardness of enamel and dentin. During last few years, there has been a great development in tooth bleaching and efforts to improve

Effect of in‐office bleaching with 35% hydrogen peroxide

Nov 01, 2015· This study aimed to evaluate effectiveness and effects of bleaching with 35% hydrogen peroxide with and without calcium on color, micromorphology, and the replacement of calcium and phosphate on the enamel surface. Thirty bovine enamel blocks (5.0 × 5.0 mm) were placed into the following groups: G1: artificial saliva (control); G2: 35% hydrogen peroxide gel without calcium (Whiteness

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

Susceptibility of Enamel Treated with Bleaching Agents to

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 peroxide,

Effect of bleaching agents having a neutral pH on the

Aim: To investigate the effect of bleaching agents having a neutral pH on the surface of mineral trioxide aggregate (MTA) used as a coronal seal material for nonvital bleaching, beneath the bleaching agent, with the help of energy dispersive X-ray microanalysis and scanning electron microscopy (SEM). Materials and Methods: Six samples of plastic tubes filled with white MTA (Angelus white) were

PT Dunia Kimia Jaya Bleaching

This product is also very effective in bleaching recycled pulp because its strong reducing properties. DEKABRIGHT BS-35 is a decoloring/bleaching agent composed with chlorine free-inorganic reductant which shows the decoloring effect to the direct, acid dyes and pigments consist of the azo and diazo groups as the chromophore in the recycled

Effect of in‐office bleaching with 35% hydrogen peroxide

Nov 01, 2015· This study aimed to evaluate effectiveness and effects of bleaching with 35% hydrogen peroxide with and without calcium on color, micromorphology, and the replacement of calcium and phosphate on the enamel surface. Thirty bovine enamel blocks (5.0 × 5.0 mm) were placed into the following groups: G1: artificial saliva (control); G2: 35% hydrogen peroxide gel without calcium (Whiteness

Comparative evaluation of two different remineralizing

, Hydrogen peroxide causes the release of free radicals, and the effect can be intensified by a reduction in pH of the bleaching agents, thus changing the microhardness of enamel and dentin. During last few years, there has been a great development in tooth bleaching and efforts to improve

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

Efficiency of tooth bleaching agent on staining and

Aug 10, 2020· Surface staining and deeper discoloration characteristics of peroxide-based bleaching agents in the nicotine stain in dental enamel model were evaluated in the present study. Nicotine stained dental enamel fragments (n = 36) were prepared and were subjected to the bleaching ingredients for a fixed treatment time of 30 min. The bleaching agents were composed of limonene, coconut

Is refined table salt bleached? Skeptics Stack Exchange

In the sense that "bleaching" means 'to make lighter' or 'to whiten'. "Bleaching" is not restricted to 'using a technical/chemical bleaching agent'. Any process used to make the product more pale or more white is 'bleaching'. (Cf — Gerhard Eisenbrand & Peter Schreier: "RÖMPP Lexikon Lebensmittelchemie", Thieme: Göttingen 2 2006. ")

How to Brighten and Whiten Laundry Martha Stewart

Sep 10, 2020· It's safe only on whites, deodorizes, and can lift stains and maintain whiteness, but it can't restore clothing to brand-new whiteness (unfortunately, nothing can). The bleaching action of liquid chlorine bleach takes about five minutes after adding it to the wash (although it may occur more quickly in hot water and more slowly in cold).

Food Additives SlideShare

Flour Bleaching Agents and Bread Improvers • Benzoyl peroxide • Commonly used flour bleaching agent • A bleaching or decolorizing action • But does not influence baking properties • Free radical initiator • Added to flour (0.25-0.075 %) at the mill • Usually added along with diluting or stabilizing agents (calcium sulfate

Effect of fluoride containing bleaching agents on enamel

Group 5: Specimens treated with an experimental bleaching agent Ex-037 containing 0.37% fluoride. Table 1 lists the bleaching agents and fluoride gel used in thisstudy.ThespecimensinGroups2–5werebleached8 hper day for 14 days. The bleaching agents were applied on the enamel and stored at 100% humidity at 37 8C. After each

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.

Pre-treatment of cotton fabric Hand Printing

To improve brightness of colour after dyeing or printing; 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 fabric are known as bleaching agents.

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.