scholarly journals Adhesion between Epoxy Resin-Based Fiber Post and Dental Core Resin Improved by Non-Thermal Atmospheric Pressure Plasma

2020 ◽  
Vol 10 (7) ◽  
pp. 2535
Author(s):  
Hyoung-Sik Kim ◽  
Song-Yi Yang ◽  
Eun Ha Choi ◽  
Kwang-Mahn Kim ◽  
Jae-Sung Kwon
Keyword(s):  
Contact Angle ◽  
Bond Strength ◽  
Epoxy Resin ◽  
Atmospheric Pressure ◽  
Shear Bond Strength ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Fiber Post ◽  
Pressure Plasma ◽  
Push Out

The purpose of the study was to evaluate the adhesion between dental core resin and epoxy resin-based fiber post after treatment with non-thermal atmospheric pressure plasma (NTAPP) and compare with conventional methods of epoxy resin-based fiber post treatments. Contact angle was measured on the surface of epoxy resin before and after NTAPP treatment and X-ray photoelectron spectroscopy was used to analyze the surface chemistry. Finally, two shear bond strength tests were carried out; shear bond strength between core resin and epoxy resin for comparison between NTAPP treated and untreated sample, and push-out shear bond strength between core resin and NTAPP treated commercially available epoxy resin-based fiber post for comparison between NTAPP treated samples with conventionally treated samples. Contact angle on the surface of epoxy resin generally decreased with increasing NTAPP treatment time with presence of surface chemical changes. Also, there was significantly higher shear bond strength and push-out shear bond strength between epoxy resin and core resin for NTAPP treated epoxy resin, even to the conventionally treated epoxy resin-based fiber post with hydrofluoric acid or silane. In conclusion, new technology of NTAPP has potential for application on the epoxy resin-based fiber post to improve endodontic restoration success rate.

scholarly journals Influence of Non-Thermal Atmospheric Pressure Plasma Treatment on Shear Bond Strength between Y-TZP and Self-Adhesive Resin Cement

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3321 ◽  
Author(s):  
Dae-Sung Kim ◽  
Jong-Ju Ahn ◽  
Eun-Bin Bae ◽  
Gyoo-Cheon Kim ◽  
Chang-Mo Jeong ◽  
...  
Keyword(s):  
Bond Strength ◽  
Surface Treatment ◽  
Atmospheric Pressure ◽  
Shear Bond Strength ◽  
Atmospheric Pressure Plasma ◽  
Resin Cement ◽  
Control Group ◽  
Adhesive Resin ◽  
Pressure Plasma ◽  
Adhesive Resin Cement

The purpose of this study was to evaluate the effect of non-thermal atmospheric pressure plasma (NTP) on shear bond strength (SBS) between yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and self-adhesive resin cement. For this study, surface energy (SE) was calculated with cube-shaped Y-TZP specimens, and SBS was measured on disc-shaped Y-TZP specimens bonded with G-CEM LinkAce or RelyX U200 resin cylinder. The Y-TZP specimens were classified into four groups according to the surface treatment as follows: Control (no surface treatment), NTP, Sb (Sandblasting), and Sb + NTP. The results showed that the SE was significantly higher in the NTP group than in the Control group (p < 0.05). For the SBS test, in non-thermocycling, the NTP group of both self-adhesive resin cements showed significantly higher SBS than the Control group (p < 0.05). However, regardless of the cement type in thermocycling, there was no significant increase in the SBS between the Control and NTP groups. Comparing the two cements, regardless of thermocycling, the NTP group of G-CEM LinkAce showed significantly higher SBS than that of RelyX U200 (p < 0.05). Our study suggests that NTP increases the SE. Furthermore, NTP increases the initial SBS, which is higher when using G-CEM LinkAce than when using RelyX U200.

Effect of Atmospheric Pressure Plasma Treatment on Shear Bond Strength Between Zirconia and Dental Porcelain Veneer

2020 ◽  
Vol 20 (9) ◽  
pp. 5683-5685
Author(s):  
Min-Kyung Ji ◽  
Jong-Tak Lee ◽  
Eun-Kyung Yim ◽  
Chan Park ◽  
Byung-Kwon Moon ◽  
...  
Keyword(s):  
Bond Strength ◽  
Plasma Treatment ◽  
Atmospheric Pressure ◽  
Shear Bond Strength ◽  
Atmospheric Pressure Plasma ◽  
Control Group ◽  
Airborne Particle ◽  
Dental Porcelain ◽  
Pressure Plasma ◽  
Group A

Various surface treatments on zirconia have been reported for dental porcelain veneer. However, it has not been determined which of these treatments provide the highest bond strength. The purpose of this study is to compare the effect of airborne particle abrasion and atmospheric pressure plasma treatment on the shear bond strength between zirconia and dental porcelain veneer. The groups were divided into four groups according to the surface treatment method: the control group, the atmospheric pressure plasma treated group (group P), the airborne particle abrasion group (group A), the atmospheric pressure plasma treated group after the airborne particle abrasion (group AP). Atmospheric pressure plasma was applied on the specimens using a plasma generator (Plasma JET, POLYBIOTECH Co. Ltd., Gwangju, Korea) and airborne-particle abraded with 110 µm. The characteristics of surface treated zirconia were analyzed by 3D-OP, XRD, XPS and contact angle. The shear bond strength was tested using a universal testing machine. The shear bond strength of group P was significantly increased compared to that of the control group (P < 0.05). The shear bond strength of group AP was significantly increased as compared to group A (P < 0.05). There was no significant difference between the group P and group A (P > 0.05). As a result of this study, the atmospheric pressure plasma treatment showed significantly higher shear bond strength than control group, but similar to the airborne particle abrasion, and the atmospheric pressure plasma treatment after the airborne particle abrasion provided the highest shear bond strength. This study demonstrated that application atmospheric pressure plasma treatment on zirconia may be useful for increasing bond strength between zirconia and dental porcelain veneer.

Epoxy Resin Surface Functionalization Using Atmospheric Pressure Plasma Jet Treatment

2012 ◽  
Vol 51 (1) ◽  
pp. 01AJ04 ◽  
Author(s):  
Waleepan Sangprasert ◽  
Piyarat Nimmanpipug ◽  
Piriya Yavirach ◽  
Vannajan Sanghiran Lee ◽  
Dheerawan Boonyawan
Keyword(s):  
Epoxy Resin ◽  
Surface Functionalization ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma

Modeling the Inactivation of Bacillus cereus in Tiger Nut Milk Treated with Cold Atmospheric Pressure Plasma

2019 ◽  
Vol 82 (11) ◽  
pp. 1828-1836 ◽  
Author(s):  
ALIYU IDRIS MUHAMMAD ◽  
RUILING LV ◽  
XINYU LIAO ◽  
WEIJUN CHEN ◽  
DONGHONG LIU ◽  
...  
Keyword(s):  
Bacillus Cereus ◽  
Atmospheric Pressure ◽  
Treatment Time ◽  
Atmospheric Pressure Plasma ◽  
Titratable Acidity ◽  
Weibull Model ◽  
Input Power ◽  
Inactivation Kinetics ◽  
Pressure Plasma ◽  
Cold Atmospheric Pressure Plasma

ABSTRACT The impact of cold atmospheric pressure plasma treatment on the inactivation kinetics of Bacillus cereus ATCC 14579 and the resulting quality changes was investigated in tiger nut (Cyperus esculentus L.) milk (TNM). The effect of input power (39, 43, and 46 W) and treatment time (0 to 270 s) was fitted using the Weibull model to represent the microbial kinetic inactivation in the treated TNM. Inactivation efficacy increased with an increase in treatment time and input power. A 5.28-log reduction was achieved at 39 to 46 W without significant changes in titratable acidity, whereas no reduction in titratable acidity was observed in the pasteurized sample. The inactivation kinetics was adequately described by the Weibull model. Higher input power of 43 and 46 W and 120 s of treatment resulted in marked decreases in pH, flavonoid concentration, and antioxidant activity compared with those parameters in pasteurized TNM. Increases in total color difference and phenolic concentrations also were observed. The results indicate that these changes were caused by the immanent plasma reactive species. This study provides valuable inactivation kinetics information for food safety assessment studies of B. cereus vegetative cells in TNM.

scholarly journals Development of Organosilicon-Based Superhydrophobic Coatings through Atmospheric Pressure Plasma Polymerization of HMDSO in Nitrogen Plasma

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 219 ◽  
Author(s):  
Siavash Asadollahi ◽  
Jacopo Profili ◽  
Masoud Farzaneh ◽  
Luc Stafford
Keyword(s):  
Contact Angle ◽  
Atmospheric Pressure ◽  
Plasma Polymerization ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Nitrogen Plasma ◽  
Superhydrophobic Surfaces ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma ◽  
Superhydrophobic Coatings

Water-repellent surfaces, often referred to as superhydrophobic surfaces, have found numerous potential applications in several industries. However, the synthesis of stable superhydrophobic surfaces through economical and practical processes remains a challenge. In the present work, we report on the development of an organosilicon-based superhydrophobic coating using an atmospheric-pressure plasma jet with an emphasis on precursor fragmentation dynamics as a function of power and precursor flow rate. The plasma jet is initially modified with a quartz tube to limit the diffusion of oxygen from the ambient air into the discharge zone. Then, superhydrophobic coatings are developed on a pre-treated microporous aluminum-6061 substrate through plasma polymerization of HMDSO in the confined atmospheric pressure plasma jet operating in nitrogen plasma. All surfaces presented here are superhydrophobic with a static contact angle higher than 150° and contact angle hysteresis lower than 6°. It is shown that increasing the plasma power leads to a higher oxide content in the coating, which can be correlated to higher precursor fragmentation, thus reducing the hydrophobic behavior of the surface. Furthermore, increasing the precursor flow rate led to higher deposition and lower precursor fragmentation, leading to a more organic coating compared to other cases.

Experimental Investigation of the Influence of the Bond Conditions on the Shear Bond Strength between Steel and Self-Compacting Concrete Using Push-Out Tests

2012 ◽  
Vol 525-526 ◽  
pp. 205-208 ◽  
Author(s):  
Peter Helincks ◽  
Wouter de Corte ◽  
Jan Klusák ◽  
Veerle Boel ◽  
Geert de Schutter
Keyword(s):  
Bond Strength ◽  
Epoxy Resin ◽  
Shear Bond Strength ◽  
High Performance Concrete ◽  
Adhesive Layer ◽  
Crushed Stone ◽  
Stress Concentrations ◽  
Concrete Core ◽  
Significant Difference ◽  
Push Out

Steel-concrete joints are often provided with welded shear studs. However, stress concentrations are induced in the structure due to the welding. Moreover, a reduction in toughness and ductility of the steel and a decreased fatigue endurance of the construction is observed. In this paper the shear bond strength between steel and ultra-high performance concrete (UHPC) without mechanical shear connectors is evaluated through push-out tests. The test samples consist of two sandblasted steel plates with a thickness of 10 mm and a concrete core. The connection between steel and concrete is obtained by a 2-component epoxy resin. Test samples with a smooth adhesive layer are compared with those with an epoxy layer, which is applied with a toothed paddle and/or gritted with small aggregates. In this research, specimens prepared with river gravel, crushed stone, and steel grit are compared and also two different epoxy resins are used. During the tests, the ultimate shear force is recorded as well as the slip between steel and concrete. All test specimens exhibited a concrete-adhesive or concrete failure. Furthermore, test results show that the use of a more fluid epoxy resin improves the anchorage of the gritted aggregates in the adhesive layer, resulting in higher shear bond stresses. No significant difference is found between specimens, gritted with river gravel or crushed stone. Applying the adhesive layer with the toothed paddle in horizontal direction slightly improves the bond behaviour. Finally, the experimental results of the test members with a smooth epoxy layer without gritted aggregates, provide test data for a fracture mechanics approach, which uses a 2D numerical model of the test specimen, composed of steel, epoxy resin, and concrete.

Hydrophilic surface modification of coronary stent using an atmospheric pressure plasma jet for endothelialization

2017 ◽  
Vol 32 (8) ◽  
pp. 1083-1089 ◽  
Author(s):  
Jae Won Shim ◽  
In-Ho Bae ◽  
Dae Sung Park ◽  
So-Youn Lee ◽  
Eun-Jae Jang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Cell Adhesion ◽  
Endothelial Cell ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Plasma Jet ◽  
Treated Group ◽  
Endothelial Cell Migration ◽  
Atmospheric Pressure Plasma Jet ◽  
Pressure Plasma

The first two authors contributed equally to this study. Bioactivity and cell adhesion properties are major factors for fabricating medical devices such as coronary stents. The aim of this study was to evaluate the advantages of atmospheric-pressure plasma jet in enhancing the biocompatibility and endothelial cell-favorites. The experimental objects were divided into before and after atmospheric-pressure plasma jet treatment with the ratio of nitrogen:argon = 3:1, which is similar to air. The treated surfaces were basically characterized by means of a contact angle analyzer for the activation property on their surfaces. The effect of atmospheric-pressure plasma jet on cellular response was examined by endothelial cell adhesion and XTT analysis. It was difficult to detect any changeable morphology after atmospheric-pressure plasma jet treatment on the surface. The roughness was increased after atmospheric-pressure plasma jet treatment compared to nonatmospheric-pressure plasma jet treatment (86.781 and 7.964 nm, respectively). The X-ray photoelectron spectroscopy results showed that the surface concentration of the C–O groups increased slightly from 6% to 8% after plasma activation. The contact angle dramatically decreased in the atmospheric-pressure plasma jet treated group (22.6 ± 15.26°) compared to the nonatmospheric-pressure plasma jet treated group (72.4 ± 15.26°) ( n = 10, p < 0.05). The effect of the increment in hydrophilicity due to the atmospheric-pressure plasma jet on endothelial cell migration and proliferation was 85.2% ± 12.01% and 34.2% ± 2.68%, respectively, at 7 days, compared to the nonatmospheric-pressure plasma jet treated group (58.2% ± 11.44% in migration, n = 10, p < 0.05). Taken together, the stent surface could easily obtain a hydrophilic property by the atmospheric-pressure plasma jet method. Moreover, the atmospheric-pressure plasma jet might affect re-endothelialization after stenting.

Promotion of adhesive penetration and resin bond strength to dentin using non-thermal atmospheric pressure plasma

2015 ◽  
Vol 124 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Jae-Hoon Kim ◽  
Geum-Jun Han ◽  
Chang-Keun Kim ◽  
Kyu-Hwan Oh ◽  
Sung-No Chung ◽  
...  
Keyword(s):  
Bond Strength ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Pressure Plasma ◽  
Adhesive Penetration
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