Spectrophotometric methods for the determination of fluoride ion usingindole-3-acetic acid interaction with iron(III)

Öztürk, Emine İlknur; Kenar, Adnan; Aksu, Mehmet Levent; Taştekin, Mustafa

doi:10.3906/kim-1807-135

Cited by 5 publications

(4 citation statements)

References 21 publications

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“…The spectrophotometric dye method was used to determine the amount of the fluoride ions released from the tested materials according to the method described by Unal et al [ 22 ]. A standard calibration curve was prepared using solutions containing different known concentrations of fluoride ions (1, 2, 10, 20, and 50 ppm).…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties, Cytotoxicity, and Fluoride Ion Release Capacity of Bioactive Glass-Modified Methacrylate Resin Used in Three-Dimensional Printing Technology

Raszewski¹,

Kulbacka

Nowakowska-Toporowska

2022

Materials

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Background: Clinically, three-dimensional (3D) printing technology is becoming a popular and efficient dental processing technology. Recently, there has been an increasing demand for dental materials that exhibit bioactive properties. The present study aimed to evaluate the mechanical properties, cytotoxicity, and fluoride ion release capacity of 3D-printed dental resins modified with bioactive glass. Materials and methods: The resin FotoDent splint used in the production of removable orthodontic splints, was modified by the addition of two types of bioactive glasses that are capable of releasing fluoride ions. The novel materials used for the production of dental splints were examined for their mechanical, physical, and biological properties (fracture resistance, sorption, solubility, elution of nonpolymeric substances, and release of fluoride ions over time) and cytotoxic effects on cell cultures. Results: Initially, the fracture toughness of the 3D-printed resin was found to be 55 MPa, but after modification with glass, the resistance was reduced to about 50 MPa. Sorption and solubility values of the materials (19.01 ÷ 21.23 µg/mm3 and 0.42 ÷ 1.12 µg/mm3, respectively) complied with the safety limits imposed by ISO standard. Modified resins were capable of releasing fluoride ions, and the maximum releasing effect was observed after 14 days of incubation. Both the modified resins, after four days of contact with human gingival fibroblasts, exhibited moderate cytotoxic properties. Conclusions: The experimental results showed that modification of methacrylate resin, used in 3D printing technology, with bioactive glasses produces novel dental materials that possess desirable bioactive properties. The findings of this study indicate the potential ability of modified polymethacrylate resins to release fluoride ions in the oral cavity environment. The modified materials are characterized with a moderate decrease in physical properties and mild cytotoxicity on direct contact with human fibroblasts.

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Section: Methodsmentioning

confidence: 99%

Mechanical Properties, Cytotoxicity, and Fluoride Ion Release Capacity of Bioactive Glass-Modified Methacrylate Resin Used in Three-Dimensional Printing Technology

Raszewski¹,

Kulbacka

Nowakowska-Toporowska

2022

Materials

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“…Fluoride releasing abilities are desirable for bioactive dental materials. The amount of released anions have to be on appropriate level to ensure protective action and also prevent its excessive intake, which can have adverse effect on human health [ 30 , 32 ]. An important question is what is the minimum concentration of fluoride that may significantly reduce the demineralization process and formation of caries lesions.…”

Section: Discussionmentioning

confidence: 99%

“…The unmodified material Superacryl Plus was used as the control group. Each specimen was stored separately in 10 cm 3 of distilled water at 37 • C. The concentration of fluoride ions was determined using the spectrophotometric method described by Unal et al [30]. This method is based on the formation of a colored complex between Fe 3+ ions (FeCl 3 , Sigma-Aldrich, Saint Louis, MO, USA) and indole-3acetic acid (Sigma-Aldrich, Saint Louis, MO, USA) in an acidic environment.…”

Section: Fluoride Ion Releasementioning

confidence: 99%

Release and Recharge of Fluoride Ions from Acrylic Resin Modified with Bioactive Glass

Raszewski¹,

Nowakowska

Więckiewicz

et al. 2021

Polymers

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Background: Oral hygiene is essential for maintaining residual dentition of partial denture wearers. The dental material should positively affect the oral environment. Fluoride-releasing dental materials help to inhibit microbial colonization and formation of plaque as well as to initiate the remineralization process in the early cavity area. Aim: To evaluate fluoride ion release and recharge capacity, sorption, and solubility of polymethyl methacrylate (PMMA) dental resin modified with bioactive glass addition. Materials and methods: Two bioactive glass materials (5 wt% Kavitan, 10 wt% Kavitan, and 10 wt% Fritex) and pure 10 wt% NaF were added to dental acrylic resin. After polymerization of the modified resins, the release levels of fluoride anions were measured based on color complex formation by using a spectrophotometer after 7, 14, 28, and 35 days of storage in distilled water at 37 °C. Subsequently, specimens were brushed with a fluoride-containing tooth paste on each side for 30 s, and the fluoride recharge and release potential was investigated after 1, 7, and 14 days. Sorption and solubility after 7 days of storage in distilled water was also investigated. Results: The acrylic resins with addition of 10% bioactive glass materials released fluoride ions for over 4 weeks (from 0.14 to 2.27 µg/cm2). The amount of fluoride ions released from the PMMA resin with addition of 10 wt% Fritex glass was higher than that from the resin with addition of 10 wt% Kavitan. The acrylic resin containing 10 wt% NaF released a high amount of ions over a period of 1 week (1.58 µg/cm2), but the amount of released ions decreased rapidly after 14 days of storage. For specimens containing 5 wt% Kavitan glass, the ion-releasing capacity also lasted only for 14 days. Fluoride ion rechargeable properties were observed for the PMMA resin modified with addition of 10 wt% Fritex glass. The ion release levels after recharge ranged from 0.32 to 0.48 µg/cm2. Sorption values ranged from 10.23 μm/mm3 for unmodified PMMA resin to 12.11 μm/mm3 for specimens modified with 10 wt% Kavitan glass. No significant differences were found regarding solubility levels after 7 days. Conclusions: The addition of 10 wt% Fritex and 10 wt% Kavitan bioactive glass materials to heat-cured acrylic resin may improve its material properties, with bioactive fluoride ion release ability lasting for over 4 weeks. The resin modified with 10 wt% Fritex glass could absorb fluoride ions from the toothpaste solution and then effectively release them. Addition of fluoride releasing fillers have a small effect on sorption and solubility increase of the modified PMMA resin. Clinical significance: The addition of bioactive glass may be promising in the development of the novel bioactive heat-cured denture base resin.

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“…The interest of the scientific community and the importance of fluoride determination is best illustrated (besides the number of existing [13][14][15][16][17][18][19]) by the development and publication of instrumental methods in recent years based on the following techniques: Gas chromatography-mass spectrometry [20], inductively coupled plasma mass spectrometry [21,22], molecular absorption spectrometry [23,24], spectrophotometry [25], ion chromatography [26], high-resolution continuum source graphite furnace atomic absorption spectrometry [27], etc. Unlike these enumerated techniques, potentiometry (one of the nondestructive techniques of electrochemical analysis based on the measurement of the potential difference under equilibrium conditions between the reference and the indicator electrodes) does not require expensive equipment, elaborate and complex sample pretreatment steps, and authorized skilled personnel.…”

Section: Introductionmentioning

confidence: 99%

Potentiometric Determination of Free Fluoride Content in Wines from Dalmatia Region (Croatia)—A Comparative Study of Direct Potentiometry and Standard Addition Method

et al. 2022

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The aim of this study was to investigate 30 different types of Dalmatian wines as a potential source of fluoride. A fluoride ion selective electrode was used to measure the fluoride concentration in each sample. The direct potentiometric method and the standard addition method were evaluated, the latter being suggested as more accurate and precise. Measurements were performed in two buffers, acetate buffer and total ionic strength adjustment buffer (TISAB), to compare their influence on fluoride determination. The obtained results show that TISAB is a better choice than acetate buffer as a medium for fluoride determination. According to the proposed method, mass concentrations of fluoride of 0.19 and 0.18 mg/L were found in the studied red and white wines, with standard deviations of 0.04 and 0.03 mg/L, respectively. All determined fluorine levels in the tested wines were within the recommended limits and do not pose a risk to human health. No significant difference was found between the fluorine content in white and red wines, but there was a difference depending on the place of origin of the wine. The measured pH values for all the wines studied (except one sample) are very similar and show no significant correlation with the fluoride content.

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Spectrophotometric methods for the determination of fluoride ion usingindole-3-acetic acid interaction with iron(III)

Cited by 5 publications

References 21 publications

Mechanical Properties, Cytotoxicity, and Fluoride Ion Release Capacity of Bioactive Glass-Modified Methacrylate Resin Used in Three-Dimensional Printing Technology

Mechanical Properties, Cytotoxicity, and Fluoride Ion Release Capacity of Bioactive Glass-Modified Methacrylate Resin Used in Three-Dimensional Printing Technology

Release and Recharge of Fluoride Ions from Acrylic Resin Modified with Bioactive Glass

Potentiometric Determination of Free Fluoride Content in Wines from Dalmatia Region (Croatia)—A Comparative Study of Direct Potentiometry and Standard Addition Method

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