Post-synthesis fluoride treatment of Analcime zeolite synthesized using a novel organic template. Crystalline, textural, and acid study

Acid-etching of enamel surfaces has been performed routinely to bond adhesive resin materials to sound dental enamel as a caries-preventive measure. The effect of fluoride pretreatment on acid-etching of enamel has been reported to produce inconsistent and unsatisfactory etching patterns. The failure to obtain an adequate etch has been postulated to be due to fluoride precipitation products deposited on the enamel surface. The purpose of this study was to evaluate the effects of fluoride pretreatment on acid-etching of carieslike lesions of human dental enamel.Caries-like lesions of enamel were created in vitro on human molar and premolar teeth. The teeth were divided into two fluoride treatment groups. The specimens were exposed for 4 minutes to either a 2% Sodium Fluoride (NaF) solution or a 10% Stannous Fluoride (SnF2) solution. The specimens were then washed in deionized-distilled water. Each tooth was sectioned into four test regions. This was carried out to compare the effects of various time exposures (0 to 2 minutes) and differing concentrations (10 to 60% w/w) of phosphoric acid (H3PO4) on etching of caries-like lesions. Standard preparation techniques for SEM were performed on the specimens.

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Stannous fluoride treatment of acid-etched caries-like lesions of enamel: A scanning electron microscopic study

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113482 ◽

1984 ◽

Vol 42 ◽

pp. 720-721

Author(s):

M. John Hicks ◽

Leon M. Silverstone ◽

David G. Gantt ◽

Catherine M. Flaitz

Keyword(s):

Acid Etching ◽

Surface Zone ◽

Electron Microscopic ◽

Fluoride Treatment ◽

Stannous Fluoride ◽

Scanning Electron Microscopic Study ◽

Demineralized Enamel ◽

Intact Surface ◽

Topical Fluoride

Although fluoride levels become elevated in sound enamel following a topical fluoride treatment, the caries-preventive effect of fluoride is thought to be due primarily to the role of fluoride in remineralization of clinically undetectable enamel lesions and hypomineralized enamel. During lesion formation, redistribution of fluoride from the enamel surface to the subsurface demineralized enamel occurs. This results in a surface zone with a relatively low fluoride content. In order to maintain an intact surface zone over a carious lesion, it may be necessary to replenish the fluoride levels with an exogenous fluoride source. By acid-etching the lesion surface, a more reactive surface is made available for fluoride interaction. In addition, porosities and etching patterns may be created, allowing for bonding of a caries-resistant resin material to the lesion surface. The purpose of this study was to determine the integrity of the caries-like lesion surface following acid-etching and subsequent stannous fluoride treatment (SnF2).

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In vitro Evaluation of Enamel Surface Treated with Fluoride After Bleaching and Etching Erosive Processes

Revista de Chimie ◽

10.37358/rc.18.7.6402 ◽

2018 ◽

Vol 69 (7) ◽

pp. 1714-1717

Author(s):

Roxana Ionela Vasluianu ◽

Norina Consuela Forna ◽

Elena Raluca Baciu ◽

Mirela Zaltariov ◽

Lavinia Vasiliu ◽

...

Keyword(s):

Enamel Surface ◽

Spectroscopy Analysis ◽

X Ray ◽

Fluoride Treatment ◽

Enamel Structure ◽

Erosion Effect ◽

Enamel Composition ◽

Morphology Changes ◽

Scanning Electron

The anti-erosion effect of fluoride on the enamel surface was investigated by ATR-FTIR, SEM and EDX techniques. Four extracted teeth (two incisors and two premolars) were initially bleached with carabamide peroxide and etched with ortho-phosphoric acid then fluoride treatment was applied. Significant differences in enamel composition and morphology were observed providing the effect of fluoride application in remineralization of teeth. Infrared spectroscopy was employed to probe the changes in enamel structure. Scanning electron microscopy/energy dispersive X-ray spectroscopy analysis revealed higher content in F of teeth enamel. Morphology changes revealed a re-mineralization of enamel surface after the treatment with fluoride gel.

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Evaluation of post synthesis treatments over commercial ZSM-5 zeolite in the reaction route of oleic acid esterification with methyl acetate

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-021-01957-2 ◽

2021 ◽

Vol 132 (2) ◽

pp. 1095-1118

Author(s):

V. M. Ribeiro ◽

H. Enzweiler ◽

F. Castilhos

Keyword(s):

Oleic Acid ◽

Methyl Acetate ◽

Reaction Route ◽

Post Synthesis ◽

Acid Esterification

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Post-synthesis of biomimetic chitosan with honeycomb-like structure for sensitive recognition of phosphorylated peptides

Journal of Chromatography A ◽

10.1016/j.chroma.2021.462072 ◽

2021 ◽

Vol 1643 ◽

pp. 462072

Author(s):

Canhong Zhu ◽

Jiani Wu ◽

Xueting Jin ◽

Yinghua Yan ◽

Chuan-Fan Ding ◽

...

Keyword(s):

Phosphorylated Peptides ◽

Post Synthesis

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Post-Synthesis Modification of Photoluminescent and Electrochemiluminescent Au Nanoclusters with Dopamine

Nanomaterials ◽

10.3390/nano11010046 ◽

2020 ◽

Vol 11 (1) ◽

pp. 46

Author(s):

Jae Hyun Kim ◽

Joohoon Kim

Keyword(s):

Near Infrared ◽

Au Nanoclusters ◽

Metallic Core ◽

Thiolate Ligand ◽

Pl Intensity ◽

Post Synthesis

Here, we report a post-synthesis functionalization of the shell of Au nanoclusters (NCs) synthesized using glutathione as a thiolate ligand. The as-synthesized Au NCs are subjected to the post-synthesis functionalization via amidic coupling of dopamine on the cluster shell to tailor photoluminescence (PL) and electrochemiluminescence (ECL) features of the Au NCs. Because the NCs’ PL at ca. 610 nm is primarily ascribed to the Au(I)-thiolate (SG) motifs on the cluster shell of the NCs, the post-synthesis functionalization of the cluster shell enhanced the PL intensity of the Au NCs via rigidification of the cluster shell. In contrast to the PL enhancement, the post-synthesis modification of the cluster shell does not enhance the near-infrared (NIR) ECL of the NCs because the NIR ECL at ca. 800 nm is ascribed to the Au(0)-SG motifs in the metallic core of the NCs.

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Application of microwave radiation in the grafting of acidic sites on SBA-15 type material

Journal of Porous Materials ◽

10.1007/s10934-021-01077-1 ◽

2021 ◽

Author(s):

Maciej Trejda ◽

Magdalena Drobnik ◽

Ardian Nurwita

Keyword(s):

Microwave Radiation ◽

Thermal Analyses ◽

Conventional Heating ◽

Material Surface ◽

Test Reaction ◽

Study Materials ◽

Mesoporous Support ◽

Acidic Sites ◽

Post Synthesis ◽

Adsorption Desorption

AbstractMesoporous silica of SBA-15 type was modified for the first time with 3-(trihydroxysiyl)-1-propanesulfonic acid (TPS) by post-synthesis modification involving microwave or conventional heating in order to generate the Brønsted acidic centers on the material surface. The samples structure and composition were examined by low temperature N2 adsorption/desorption, XRD, HRTEM, elemental and thermal analyses. The surface properties were evaluated by esterification of acetic acid with n-hexanol used as the test reaction. A much higher efficiency of TPS species incorporation was reached with the application of microwave radiation for 1 h than conventional modification for 24 h. It was found that the structure of mesoporous support was preserved after modification using both methods applied in this study. Materials obtained with the use of microwave radiation showed a superior catalytic activity and high stability.

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