scholarly journals Effect of pH Cycling Frequency on Glass–Ceramic Corrosion

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3655
Author(s):  
Shu-Min Hsu ◽  
Fan Ren ◽  
Christopher D. Batich ◽  
Arthur E. Clark ◽  
Dan Neal ◽  
...  
Keyword(s):  
Weight Loss ◽  
Glass Ceramic ◽  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Ceramic Materials ◽  
Ion Concentration ◽  
Ion Release ◽  
Effect Of Ph ◽  
Ph Changes ◽  
Glass Ceramic Materials

The effect of pH changes on the chemical durability of dental glass–ceramic materials was evaluated using weight loss and ion release levels. The hypothesis that increased pH changes will exhibit greater corrosion was investigated. The ion concentration was analyzed using inductively coupled plasma atomic emission spectrometer (ICP). The surface compositions were investigated using X-ray photoelectron spectroscopy (XPS). The surface morphologies were examined using scanning electron microscopy (SEM). Dental glass–ceramics were tested in constant immersion, 3-day cycling, and 1-day cycling with pH 10, pH 2, and pH 7 for 3, 15, and 30 days. The 1-d cycling group demonstrated the highest levels of weight loss compared with 3-d cycling and constant immersion. For the ion release, Si4+ and Ca2+ had the highest rates of release in 1-d cycling, whereas the Al3+ release rate with constant pH 2 was highest. The alteration/passivation layer that was formed on the surface of disks possibly prevented further dissolution of pH 10 corroded disks. XPS analysis demonstrated different surface compositions of corroded disks in pH 10 and pH 2. Si4+, K+, Na+, Al3+, and Ca2+ were detected on the surface of corroded pH 10 disks, whereas a Si4+ and P5+-rich surface formed on corroded pH 2 disks. SEM results demonstrated rougher surfaces for corroded disks in cycling conditions and pH 2 constant immersion. In conclusion, increased pH changes significantly promote the corrosion of dental glass–ceramic materials.

scholarly journals Novel Coating to Minimize Corrosion of Glass-Ceramics for Dental Applications

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1215 ◽  
Author(s):  
Shu-Min Hsu ◽  
Fan Ren ◽  
Zhiting Chen ◽  
Mijin Kim ◽  
Chaker Fares ◽  
...  
Keyword(s):  
Weight Loss ◽  
Inductively Coupled Plasma ◽  
Glass Ceramics ◽  
Atomic Emission ◽  
Ceramic Materials ◽  
Sem Analysis ◽  
Ion Concentration ◽  
Ion Release ◽  
Inductively Coupled ◽  
Dental Applications

The effect of a novel silicon carbide (SiC) coating on the chemical durability of a fluorapatite glass-ceramic veneer was investigated by examining weight loss and ion release levels. The hypothesis that this novel coating will exhibit significant corrosion resistance was tested. Inductively coupled plasma atomic emission spectrometer (ICP) was used for ion concentration determination and scanning electron microscopy (SEM) for surface morphology analyses. Samples were immersed in pH 10 and pH 2 buffer solutions to represent extreme conditions in the oral cavity. Analyses were done at 15 and 30 days. The SiC coated group demonstrated significant reduction in weight loss across all solutions and time points (p < 0.0001). Ion release analyses demonstrated either a marginally lower or a significantly lower release of ions for the SiC-coated disks. SEM analysis reveals planarization of surfaces by the SiC-coated group. The surfaces of coated samples were not as corroded as the non-coated samples, which is indicative of the protective nature of these coatings. In conclusion, SiC is a novel coating that holds promise for improving the performance of ceramic materials used for dental applications.

scholarly journals Ion Release from Dental Implants, Prosthetic Abutments and Crowns under Physiological and Acidic Conditions

Coatings ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 98
Author(s):  
María Arregui ◽  
Florian Latour ◽  
Francisco Javier Gil ◽  
Román A. Pérez ◽  
Luis Giner-Tarrida ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Dental Implants ◽  
Inductively Coupled Plasma ◽  
Ion Concentration ◽  
Ion Release ◽  
Inductively Coupled ◽  
Immersion Medium ◽  
The Media ◽  
Acidic Conditions ◽  
Clinical Conditions

Ion release from dental implants and prosthetic restoration can affect osteointegration and implant viability over a long period of time. Therefore, the aim of this study was to study the ion release from implants and crowns, with and without intermediate anodized abutments, in two different media, simulating clinical conditions. The implants, intermediate prosthetic abutments and Cr–Co crowns were divided into two groups depending on the media: Hanks’ solution and 1% lactic acid, simulating body fluids and microbiologically conditioned fluids, respectively. The study followed the ISO 10271:2011 and 10993-15:2000 standards modified to simulate the replacement of fluids in the oral environment. The ions’ release was measured by inductively coupled plasma mass spectroscopy (ICP-EOS), and only aluminum, chromium, cobalt, titanium and vanadium were identified. Ion concentration was higher in lactic acid than in Hanks’ solution at all time points (p < 0.05). Only vanadium showed a very low ion release in lactic acid, with no statistically significant differences from the ion release in Hanks’ solution (p = 0.524). Both anodized abutments and the immersion medium influenced the release of ions and affected the corrosion of these structures. The presence of an intermediate anodized abutment also affected ion release, as the level of ions was lower in groups with this component.

scholarly journals Preparation of basalt-based glass ceramics

2003 ◽  
Vol 68 (6) ◽  
pp. 505-510 ◽  
Author(s):  
Branko Matovic ◽  
Snezana Boskovic ◽  
Mihovil Logar
Keyword(s):  
Optical Microscopy ◽  
Phase Analysis ◽  
Glass Ceramic ◽  
Glassy Phase ◽  
Raw Materials ◽  
Glass Ceramics ◽  
High Strength ◽  
Ceramic Materials ◽  
X Ray ◽  
Glass Ceramic Materials

Local and conventional raw materials?massive basalt from the Vrelo locality on Kopaonik mountain?have been used as starting materials to test their suitability for the production of glass-ceramics. Crystallization phenomena of glasses of the fused basalt rocks were studied by X-ray phase analysis optical microscopy and other techniques. Various heat treatments were used and their influences, on controlling the microstructures and properties of the products were studied with the aim of developing high strength glass-ceramic materials. Diopside CaMg(SiO3)2 and hypersthene ((Mg,Fe)SiO3) were identifies as the crystalline phases. The final products contained considerable amounts of a glassy phase. The crystalline size was in range of 8?480 ?m with plate or needle shape. Microhardness, crashing strength and wears resistence of the glass-ceramics ranged from 6.5?7.5, from 2000?6300 kg/cm2 and from 0.1?0.2 g/cm, respectively.

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