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Phytic Acid - How Can It Be Applied In Dentistry?

Pfeffer detected phytic acid for the first time in 1872, and Posternak coined the word "la phytine" in 1903. It is also known as inositol hexakisphosphate (IP6), inositol polyphosphate, or phytate when it is in salt form.

Anderson first reported the IP6 structure in 1914, and Johnson and Tate later used nuclear magnetic resonance spectroscopy to validate this.

With the chemical formula C6H18O24P6, IP6 is a saturated cyclic acid and the phosphate ester of inositol.

Due to its six phosphate groups, which partially ionize at physiological pH and counter the negative charges with cations, primarily sodium ions, it has a high density of negative charges.

In the course of this review, phytic acid and its salt, "phytate," are both referred to as IP6.

IP6, which is present in large quantities in plants, serves an important nutritional function as the main phosphorus storage form in many plant tissues, including bran and seeds.

Additionally, myoinositol, a precursor to cell walls, is thought to be present in it. Myoinositol polyphosphates are present in all animal cells, and IP6 is the most prevalent form, with a concentration in mammalian cells ranging from 10 to 100 µM, depending on the cell type and developmental stage.

What Is Phytic Acid?

Phytic acid is a natural anti-oxidant found primarily in grains, nuts, and seeds. Cereals, legumes, and several vegetables are among the foods high in phytic acid.

Because it hinders the absorption of minerals, phytic acid is regarded as an antinutrient. Recent research has revealed further health advantages, including the prevention and treatment of various illnesses, including cancer.

People who already have a mineral shortage should be cautious about how much phytic acid they consume and may wish to speak with a dietician or healthcare professional.

Phytic Acid: What You Need To Know!

What Can Phytic Acid Be Used For?

A potent antioxidant is what phytic acid is. Free radicals are taken out of the body's cells with the aid of antioxidants. These are the cellular metabolism's highly reactive byproducts. Free radicals have the potential to accelerate the onset of cancer and other diseases if they are not controlled.

Overall, phytic acid-containing foods are nutrient-dense. These items are crucial to a healthy, well-balanced diet for the majority of people.

Cancer

Phytic acid may offer protection against several malignancies. By reducing oxidative damage to intestinal cells, phytic acid may be especially protective against colon cancer.

Osteoporosis

Consuming phytates appears to have an anti-osteoporosis effect. In a study of postmenopausal women, those with lower urine phytate levels (suggesting a lower dietary intake) had a higher risk of bone loss and hip fracture than those with higher levels (suggesting a higher dietary intake).

Using Phytic Acid In Dental Cements

Dental cements are used to restore prepared teeth for an indefinite or definite period, depending on the restoration's physical properties and predicted lifespan. Ideal cement must be strong enough to withstand functional stresses and resistant to dissolution in the oral environment.

Dental cements are required during fixed appliance-based orthodontic therapy to connect bands and brackets to tooth structure and protect against dental cavities. New or improved dental cements are being developed, while some have been withdrawn from the market.

Studies suggest that adding IP6 to dental cement improves its chemical and physical qualities. In 1980, adding IP6 to aluminosilicate glass created a fast-setting cement through an acid-base reaction.

The produced cement was resistant to water and acid and adhered better to enamel than dentine due to dentine's lower mineral content. IP6 improves zinc phosphate cement's mechanical characteristics. IP6 at 2% doubled compressive strength.

Adding 3–5% IP6 to phosphoric acid increased compressive strength. When IP6 was applied alone, the reaction was fast and the setting time was brief and controlled by altering the IP6-to-phosphoric acid ratio or the water content.

The increased stability of zinc phytate relative to zinc phosphate prevented leaching from the cement when phosphoric acid was replaced with IP6. IP6's key benefit was speed.

This characteristic may benefit orthodontics if a large area of cement is exposed to saliva. At high IP6 concentrations, the cement becomes too viscous and thick, making it unsuitable for dental use.

Using Phytic Acid In Oral Care Products

Dentifrices and mouth rinses are multipurpose, delivering a variety of benefits to address oral problems such as caries, gingivitis, dentine hypersensitivity, teeth whitening, and halitosis. Adding chemical agents to traditional goods to improve their functions, such as cavity prevention, plaque inhibition, or stain removal, is an interesting subject of study.

Different kinds of phosphate compounds, including IP6, may prevent caries. Earlier investigations suggested utilizing IP6 as a cariostatic agent.

These studies found an increase in caries with decreasing IP6 intake due to dietary modifications and food processing. Several early investigations found that IP6 reduced experimental caries in mice. However, other researchers found that IP6 had weak or no protective effect.

Several paths have been postulated for IP6's cariostatic mechanism. Most research proposes a local, not systemic, influence. IP6 rapidly adsorbs to hydroxyapatite, generating a monomolecular layer on the crystal surface that increases enamel's acid resistance by acting as a diffusion barrier to ions and inhibiting hydroxyapatite development.

IP6 is located on hydroxyapatite's surface but cannot diffuse into the crystal. Calcium-IP6 complexes may form and precipitate on the crystal surface. The IP6 level on hydroxyapatite surfaces was not changed by washing or acid dissolution, indicating it was strongly bonded.

Adsorption of IP6 to hydroxyapatite may also affect surface charge and free energy, reducing salivary protein and bacterial attraction to tooth surfaces and preventing plaque formation.

Is Phytic Acid That Bad?: Dr.Berg

Using Phytic Acid In Etching Agents

Since 1955 until 1979, dentists have used 37% phosphoric acid to etch enamel and dentine. Hydroxyapatite and other dentine components inhibit etching agents' contact with dentine.

Dentine demineralization may also be affected by acid content. An acidic agent eliminates the smear layer and superficial dentine, opens dentinal tubules, demineralizes the dentine surface, and enhances intertubular dentine microporosity.

Phosphoric acid etching improves enamel bonding, but it's too aggressive for dentine. Phosphoric acid on dentine exposes collagen fibrils without hydroxyapatite.

These weak collagen networks can collapse, inhibiting optimum resin infiltration and perhaps causing postoperative discomfort. Phosphoric acid regulates proteolytic enzymes in dentine, shortening the lifespan of resin-based restoratives.

Several ways have been suggested to reduce phosphoric acid's enzymatic action on dentine, such as using maleic acid, citric acid, lactic acid, or ethylenediaminetetraacetic acid (EDTA). Crosslinking agents may strengthen the exposed collagen network.

In 2013, IP6 was studied as a dentine etching agent, and results showed that it boosted resin-to-dentine bond strength compared to phosphoric acid. Phosphoric acid, at lower concentrations than IP6, removes the dentin smear layer while causing less damage to pulpal cells.

Two events may increase resin-dentine bonding. First, IP6 forms insoluble calcium complexes above pH 4.

Due to dentine's strong buffering capacity, IP6's pH increases during neutralization, facilitating the creation of an insoluble compound that may stabilize exposed collagen. Second, IP6 cross-links collagen.

Using Phytic Acid In Chelating Agents

Mechanical and chemical debridement are necessary for root canal therapy. Mechanical debridement generates a smeared layer inside canal walls, causing an imperfect closure and lack of obturation material adaptation. Despite the lack of unanimity on removing the smearing layer, much of the literature promotes it.

Sodium hypochlorite is the most extensively used intra-canal irrigant. However, it doesn't eliminate the smear layer, which is why chelating chemicals are utilized in endodontics. Since 1957, 17% EDTA has been the chemical of choice for smear layer removal.

EDTA is an overused contaminant. EDTA isn't biodegradable, hence it shouldn't be extruded into periapical tissue. Despite its prominence, chelating agents are still being sought.

MTAD (doxycycline, citric acid, and a detergent) has been researched as a smear layer removal. Nassar et al. suggested IP6 as a root canal chelating agent. IP6's strong affinity for calcium is due to its numerous negative charges.

IP6 at lower concentrations than EDTA eliminates the smearing layer and opens dentinal tubules while being biocompatible with osteoblastic cells. The latter discovery was based on alkaline phosphatase activity and viability tests compared to EDTA, which may translate to faster periapical wound healing in extrusion situations.

Milder effects on osteoblast cells may be explained by the lower concentration of IP6 needed to eliminate the inorganic component of the smear layer and its favorable qualities to shield the cells from iron-induced damage. According to Eymirli et al., IP6 and EDTA removed intracanal triple antibiotic paste and calcium hydroxide from root dentine similarly. Afshan et al. observed that 1% IP6 had less erosive potential and smearing layer removal capacity than 17% EDTA.

Using Phytic Acid In Implantology

Researchers are seeking better implants in a fast-growing dental area. The implant industry is continually improving dental implant surfaces to promote structural and functional osseointegration.

Surface form, composition, and tissue contact affect osseointegration. Phosphoric acid is used to treat implant surfaces before insertion to enhance healing and attachment. During surgical peri-implantitis treatment, phosphoric acid is used to decontaminate implant surfaces.

Recent investigations explored IP6 as a surface-treating option. Direct reactivity of IP6 phosphate groups with titanium oxide can covalently functionalized titanium surfaces without a crosslinker. Bioactive functionalized surfaces may minimize bone resorption and increase osseointegration. Bacterial biofilm adherence was reduced.

Implant success is influenced by the titanium oxide coating on the implant surface. Several studies have been conducted in an attempt to alter this oxide layer in order to improve biological performance and clinical outcomes. Zhang et al. evaluated IP6's effect on titanium oxide.

In their research, liquid phase deposition of this layer was aided by an IP6 template that stimulated nucleation and accelerated titanium oxide growth, resulting in a homogeneous, compact coating with hydrophilic behavior and outstanding bending strength. IP6's chemical structure and characteristics may allow it to bridge titanium implant surfaces and calcium ions.

This was the basis of a 2019 study by Liu et al., in which calcium was successfully bound to implant surfaces via hydrothermal treatment with IP6 and released over time. Super-hydrophilicity, enhanced cell adhesion and proliferation, and up-regulation of osteogenic-related genes were also identified.

Different legumes that are rich in phytic acid arranged close to each other
Different legumes that are rich in phytic acid arranged close to each other

Using Phytic Acid For Dental Regeneration

Regenerative endodontics is gaining popularity. The goal is to restore and sustain tooth vitality by replacing damaged tooth structure, such as dentine and pulp-dentine complexes. Regenerative endodontics uses pulp and dentine.

The pulp has regenerating stem cells with variable tendency. Dentine matrix components are released after tissue damage. Bioactive substances, including bone morphogenetic proteins and growth factors, have been found in dentin.

Endodontic irrigants and materials release dentine-bound bioactive compounds during regeneration. EDTA is the gold standard in regenerative endodontics due to its ability to demineralize dentine and release growth factors. EDTA improves dental pulp stem cell adhesion, motility, and differentiation into odontoblast-like cells.

IP6 research is scarce. Deniz Sungur et al. evaluated 1% IP6, 17% EDTA, and 9% etidronic acid on growth factor release, stem cell migration, and viability in 2018. IP6 promotes TGF-β release, which increases pulpal cell migration and proliferation. EDTA and etidronic acid were released at a lower rate.

The differences weren't significant. After 24 hours, EDTA and IP6 caused identical cell migration and proliferation. At this exposure time, EDTA-treated cells were constricted and spherical, while IP6-treated cells were polygonal and stretched out on the dentine surface.

Atesci et al. evaluated the effects of 17% EDTA and 1% IP6 on mesenchymal stem cell activity. These drugs did not affect stem cell proliferation or dentine attachment. EDTA and IP6 release equivalent amounts of TGF-β and VEGF. In cell-free solutions containing dentine discs, IP6 released the most BMP2 and FGF2. Compared to EDTA, the difference wasn't significant.

People Also Ask

Is Phytic Acid Safe?

The Cosmetics Ingredient Review Expert Panel has determined that phytic acid is safe for use in cosmetic products. In leave-on cosmetics, concentrations of up to 2% are permitted. Eye makeup removers, for example, have a 0.05% phytic acid content restriction because they are rinse-off products.

How Do You Remove Phytic Acid?

The most popular technique for removing phytic acid from cereals is milling. This method removes the phytic acid, but it also removes a significant amount of minerals and dietary fiber, which has serious drawbacks. Soaking is the most common and important method for cereal germination and fermentation.

Is Oatmeal High In Phytic Acid?

Phytase, an enzyme that naturally breaks down phytic acid, is activated by soaking in the oats. Oats do not, however, contain a considerable quantity of the phytase enzyme in comparison to other cereals. As a result, you might want to think about including a complementary grain or yeast to further lower the phytic acid content.

Does Lemon Juice Neutralize Phytic Acid?

When phytic acid is soaked in water and a tiny amount of an acidic substance, such as vinegar or lemon juice, is added, the reaction can be neutralized in as little as 7 hours. Solubilized gluten, a difficult-to-digest protein present in grains including wheat, spelt, rye, and barley, is likewise broken down by soaking.

Conclusions And Future Directions

Phytic acid is a flexible substance that is well suited for the creation of new dental care products and the enhancement of already effective materials in a range of dental applications. Even though the uniqueness and significance of IP6 for a number of possible dental applications have been discovered early, most IP6-related research is still in its infancy and is at best in the experimental stages. However, fresh and fairly compelling experimental findings have recently been generated.

The case for using IP6 in dentistry is becoming more and more clear, and the outcomes are too compelling to be disregarded. To further strengthen this evidence, additional rigorous research methodologies toward clinical investigations are required due to a number of limitations in the existing literature. Consideration of some of the suggestions and recommended future studies outlined in this review study may enable more effective usage of IP6 in a number of dental contexts.

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About The Authors

Suleman Shah

Suleman Shah - Suleman Shah is a researcher and freelance writer. As a researcher, he has worked with MNS University of Agriculture, Multan (Pakistan) and Texas A & M University (USA). He regularly writes science articles and blogs for science news website immersse.com and open access publishers OA Publishing London and Scientific Times. He loves to keep himself updated on scientific developments and convert these developments into everyday language to update the readers about the developments in the scientific era. His primary research focus is Plant sciences, and he contributed to this field by publishing his research in scientific journals and presenting his work at many Conferences. Shah graduated from the University of Agriculture Faisalabad (Pakistan) and started his professional carrier with Jaffer Agro Services and later with the Agriculture Department of the Government of Pakistan. His research interest compelled and attracted him to proceed with his carrier in Plant sciences research. So, he started his Ph.D. in Soil Science at MNS University of Agriculture Multan (Pakistan). Later, he started working as a visiting scholar with Texas A&M University (USA). Shah’s experience with big Open Excess publishers like Springers, Frontiers, MDPI, etc., testified to his belief in Open Access as a barrier-removing mechanism between researchers and the readers of their research. Shah believes that Open Access is revolutionizing the publication process and benefitting research in all fields.

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