The Effect of Acid Solution on Dental Magnetic Attachment

2021 ◽  
Vol 1028 ◽  
pp. 383-388
Author(s):  
An-Nissa Kusumadewi ◽  
Lisda Damayanti ◽  
Rukiah ◽  
Risdiana
Keyword(s):  
Acid Solution ◽  
Metal Ions ◽  
Testing Machine ◽  
Atomic Absorption Spectrophotometry ◽  
Attractive Force ◽  
Acid Solutions ◽  
Corrosion Resistant ◽  
Surface Corrosion ◽  
Magnetic Attraction ◽  
Magnetic Attachment

Dental magnetic attachments used as a retainer for overdentures are encapsulated with a corrosion resistant casing to prevent corrosion of magnets. However, some studies reported that the casing still has a risk of corrosion. This study aims to determine the effect of acid solutions on magnetic attractive force, dissolving metal ions and corrosion of magnetic attachment surfaces. The dental magnetic attachment material used is Magfit DX 600 (Aichi, Japan). It consists of assembly and keeper. The assembly and keeper immersed in acid solutions with a pH of 3.8 and 5.8 for 7 and 14 days. After immersion, the assembly and keeper were analyzed using SEM, universal testing machine, and the atomic absorption spectrophotometry to determine the surface corrosion, the magnetic attractive force, and dissolved metal ions, respectively. It is found that all assemblies showed signs of corrosion and reduction of magnetic attractive force after immersed in acid solutions with a pH of 3.8 and 5.8 for 7 and 14 days. A greater decrease in magnetic attraction was obtained at 14 days immersion in an acid solution with a pH of 3.8. Fe ion dissolution in the assembly and keeper was found to increase at 14 days of immersion. The lower the pH of the acid solution and the longer the immersion time, the signs of corrosion on the surface of dental magnetic attachment are clearly observed. The magnetic attraction force also decreased with decreasing the value of pH as well as the increase of the content of Fe ion in immersed solution.

Acid Attack Resistance of Magnesium Phosphate Cement

2016 ◽  
Vol 680 ◽  
pp. 392-397
Author(s):  
Zhu Ding ◽  
Meng Xi Dai ◽  
Can Lu ◽  
Ming Jie Zhang ◽  
Peng Cui
Keyword(s):  
Compressive Strength ◽  
Acid Solution ◽  
Portland Cement ◽  
Magnesium Phosphate ◽  
Acid Solutions ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Acid Attack ◽  
High Acid ◽  
Repair Materials

Magnesium phosphate cements (MPC) had been used as repair materials for deteriorated Portland cement concrete structures. In this paper a new MPC was prepared and the basic properties including workability and compressive strength were tested. The acid attack resistance of MPC was investigated by immersing the MPC mortars in solutions at pH 3, 5, and 7, for 14d, 28d and 60d respectively. The compressive strength of MPC mortars after acid attack was tested and the microstructure of MPC were examined. The results showed that the compressive strength of MPC decreased after immersion in acid solution for 14d and 28d, however the strength of MPC with suitable materials mixture can recovered again after 60d immersion. The results indicated MPC has high acid attack resistance in static acid solution. The behavior of MPC in flowing acid solutions is need to be studied further.

scholarly journals Evaluation of Corrosion Resistant of Amorphous Fe-Ni-Cr-Ta Alloys in Hot Concentrated Sulfuric Acid Solution

2000 ◽  
Vol 64 (5) ◽  
pp. 367-370
Author(s):  
Hideyuki Ogishi ◽  
Takeshi Suemitsu ◽  
Akira Takashima ◽  
Hyoe Ono ◽  
Hidemi Ukai ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Sulfuric Acid Solution ◽  
Corrosion Resistant ◽  
Concentrated Sulfuric Acid

A model study on the impact of metal ions on pre-vulcanization of concentrated natural rubber latex and dipped-products

2021 ◽  
pp. 147776062110629
Author(s):  
Porntip Rojruthai ◽  
Narueporn Payungwong ◽  
Jitladda T Sakdapipanich
Keyword(s):  
Natural Rubber ◽  
Metal Ions ◽  
Colloidal Stability ◽  
Mechanical Stability ◽  
Testing Machine ◽  
Natural Rubber Latex ◽  
Tensile Testing Machine ◽  
Model Study ◽  
Stability Time ◽  
The Impact

A model study on the influence of some heavy metal ions on the stability and vulcanization efficiency of uncompounded and compounded high-ammonia natural rubber (HANR) latex was carried out by an exogenous addition and then determined by Brookfield viscometer, mechanical stability time (MST) tester, and tensile testing machine. The case of pre-vulcanized HANR latex with different aging times was determined by the change in the volatile fatty acid (VFA) number, MST, and viscosity. The compounded HANR latex was coagulated by adding Mn2+and Mg2+ while it was unaltered by adding Zn2+, Fe2+, and Cu2+ ions, leading to their colloidal stability. Therefore, these metal ions were chosen further to study the pre-vulcanization of compounded HANR latex. The presence of Zn2+, Fe2+, and Cu2+ in the latex is responsible for the delay in the vulcanization process and changes the appearance of compounded latex. Before compounding, the addition of such metal ions led to the reduction in tensile strength of the obtained gloves. At the same time, there was no effect on the tensile properties of the gloves made from the compounded HANR latex containing the metal ions.

scholarly journals Study on The Third-Order NLO Properties of Trace Metal Ions in Nitric Acid Solution by Closed-Aperture Z-scan Technique

2020 ◽  
Vol 1484 ◽  
pp. 012005
Author(s):  
Muhammad Izz Rosli ◽  
Afiq Awalludin ◽  
Maisarah Duralim ◽  
Mundzir Abdullah ◽  
Muhammad Safwan Abd Aziz
Keyword(s):  
Nitric Acid ◽  
Acid Solution ◽  
Trace Metal ◽  
Metal Ions ◽  
Nitric Acid Solution ◽  
Closed Aperture ◽  
Third Order ◽  
Nlo Properties ◽  
Trace Metal Ions ◽  
The Third

scholarly journals Relation between Attractive Force and Keeper Surface Characteristics of Iron-neodymium-boron Magnetic Attachment Systems

2007 ◽  
Vol 26 (3) ◽  
pp. 393-400 ◽  
Author(s):  
Norihisa OHASHI ◽  
Hiroyasu KOIZUMI ◽  
Yumi ISHIKAWA ◽  
Mika FURUCHI ◽  
Hideo MATSUMURA ◽  
...  
Keyword(s):  
Surface Characteristics ◽  
Attractive Force ◽  
Magnetic Attachment

Study on Properties of Extraction Palladium(II) with the New Synthesized Material

2013 ◽  
Vol 774-776 ◽  
pp. 1342-1345 ◽  
Author(s):  
Shao Ping Feng ◽  
Zhao Long Huang ◽  
Wei Liu ◽  
Zi Jing Li ◽  
Yan Jiang ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Hydrochloric Acid ◽  
Acid Solution ◽  
Contact Time ◽  
Acid Solutions ◽  
Quantitative Extraction ◽  
Hydrochloric Acid Solutions ◽  
Thiourea Concentration ◽  
Extraction Parameters ◽  
Hcl Concentration

In this study, the solvent extraction of Pd(II) from hydrochloric acid solutions was investigated using the new synthesized material, 2-ethylhexyl benzothiazolyl sulfide (EHBTS) which was dissolved in xylene. Pd(II) was strongly extracted by 7% EHBTS in a lower concentration hydrochloric acid solution. Extraction parameters of Pd(II), including EHBTS concentration in different diluents, contact time of aqueous and organic phases, organic/aqueous (O/A) phase ratio and HCl concentration of aqueous phase, were studied. Quantitative extraction of Pd(II) occurred at 0.1 mol.L-1 of HCl concentration, 7% of EHBTS concentration, 1.0 of O/A, 40 min of contact time. In addition，the percentage stripping of Pd(II) could be more than 98% when thiourea concentration was 0.8 mol.L-1. EHBTS can be used more than 8 as extractant to extract of Pd(II) from hydrochloric acid solutions.

Determination of Free and Bound Cd, Zn, Cu, and Ag Ions in Lobster (Homarus americanus) Digestive Gland Extracts by Gel Chromatography Followed by Atomic Absorption Spectrophotometry and Polarography

1993 ◽  
Vol 76 (4) ◽  
pp. 794-798 ◽  
Author(s):  
Chiu L Chou ◽  
John F Uthe ◽  
Robert D Guy
Keyword(s):  
Molecular Weight ◽  
Metal Ions ◽  
Atomic Absorption ◽  
Gel Permeation Chromatography ◽  
Weight Fraction ◽  
Atomic Absorption Spectrophotometry ◽  
Divalent Metal ◽  
Divalent Metal Ions ◽  
Absorption Spectrophotometry ◽  
Gel Permeation

Abstract Gel-permeation chromatography followed by atomic absorption spectrophotometric and polarographic analyses were used to measure free and bound divalent metal ions in lobster digestive gland extracts prepared with or without oc-toluenesulfonyl fluoride, a protease inhibitor. Chromatography on Sephadex G-50 or G-100 yielded 3 UV-absorbing peaks, which corresponded, respectively, to the void volume, a medium molecular weight fraction, and a low molecular weight fraction that contained free divalent metal ions. In protease-inhibited extracts, only Zn+2 was found, whereas Cd, Cu, and Ag were bound in high and medium molecular weight fractions. Cd+2 and Zn+2 were rapidly released from their bound forms in the absence of a protease inhibitor, and their presence was confirmed by polarography with EDTA. Gel-permeation chromatography coupled with atomic absorption spectrophotometry offers a rapid method for following changes in the concentrations of bound and free metal ions during processing of shellfishbased foodstuffs.

Development of Technology of Robotized Laser Welding of Thin Wall Products from Heat-Resistant Alloys

2020 ◽  
Vol 992 ◽  
pp. 663-669
Author(s):  
S.E. Krylova ◽  
V.A. Zavyalov ◽  
M.I. Goltapin
Keyword(s):  
Corrosion Resistance ◽  
Comparative Analysis ◽  
Laser Welding ◽  
Intercrystalline Corrosion ◽  
Industrial Technology ◽  
Thin Wall ◽  
Corrosion Resistant ◽  
Surface Corrosion ◽  
Heat Resistant

Results of the developed industrial technology of restoration of a surface corrosion-resistant staly are presented by method of laser building up. The comparative analysis of a microstructure of the built-up wearproof layer, an alloyage zone with material of a basis and diffusive zone at the different technological modes of building up is given. Influence of morphology of particles of additive powder on parametrical characteristics of the roller received by laser gas powder building up is investigated. The optimum modes of building up on a substrate from steel 12Cr18Ni10Ti are set. Tests for firmness against intercrystalline corrosion of the built-up powder compositions are executed by the AM method. Metalgraphic assessment of corrosion resistance is presented.

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