• 대한치과보철학회지
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• 제45권2호
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• pp.216-227
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• 2007

Statement of problem: For the long-term success of removable partial dentures, the bonding between metal framework and denture base resin is one of the important factors. To improve bonding between those, macro-mechanical retentive form that is included metal framework design has been generally used. However it has been known that sealing at the interface between metal framework and denture base resin is very weak, because this method uses mechanical bonding. Purpose: Many studies has been made to find a simple method which induces chemical bond, now various bonding system is applied to clinic. In this experiment, shear bond strengths of heat-cured denture base resin to the surface-treated Co-Cr alloy were measured before and after thermocycling. Chemically treated groups with Alloy $Primer^{TM}$, Super-Bond $C&B^{TM}$, and tribochemically treated group with $Rocatec^{TM}$ system were compared to the beadtreated control group. The data were analyzed with two-way ANOVA. Result: 1. Shear bond strength of bead-treated group is highest, and Alloy $Primer^{TM}$ treated group, Super-Bond $C&B^{TM}$ treated group, RocatecTM system treated group were followed. Statistically significant differences were found in each treated group(p<0.05). 2. Surface treatment and thermocycling affected shear bond strength(p<0.05), however there was no interaction between two factors(p>0.05). 3. Shear bond strengths of bead-treated group and Alloy $Primer^{TM}$ treated group showed no statistically significant difference before and after thermocycling(p>0.05), and those of Super-Bond $C&B^{TM}$ treated group and $Rocatec^{TM}$ system treated group showed statistically significant difference after thermocycling(p<0.05).

• 폴리머
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• 제24권6호
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• pp.877-885
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• 2000

본 연구에서는 폴리락타이드 (PLA), 폴리글리콜라이드 (PGA) 그리고 이들의 공중합체인 PLGA 필름을 염소산 혼합용액 [70% 과염소산 (HClO$_4$)/포타슘 클로레이트 (KClO$_3$) 포화 수용액, 3 : 2]으로 처리하여 표면의 젖음성과 세포적합성을 증가시켰다. 표면 처리된 고분자의 표면을 물접촉각 측정과 ESCA, SEM으로 특성결정하였다. 염소산 처리된 PLA, PGA, 및 PLGA의 표면 젖음성은 처리시간이 증가함에 따라 증가되었고 이들 고분자 필름은 기존의 에탄을 전처리와 달리 건조 후에도 친수성 표면을 유지하였다. 세포 점착실험은 섬유아세포를 염소산 처리된 필름의 표면에서 1일 및 2일 배양하였고 표면의 젖음성이 증가함에 따라 세포의 점착도 우세하였다. 결론적으로 본 연구에서는 표면의 젖음성은 세포의 점착과 증식 거동에 중요한 역할을 한다는 것을 증명하였다.

• 한국치위생학회지
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• 제19권2호
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• pp.307-315
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• 2019

Objectives: The aim of this study was to investigate the characterization of composite resin inlay surface with silane and non-thermal atmospheric pressure plasma treatment. Methods: Composite resin inlay was used as a specimen, which was treated by sandblasting + silane and sandblasting + plasma. The untreated specimens were assigned to the control group. Specimens were analyzed for surface roughness, color change, and chemical composition. Statistical analyses were performed using one-way ANOVA test (p<0.05). Results: The present findings showed that the roughness and color changes of the plasma-treated surface were significantly lower than those of the silane-treated surface. In addition, a change in the chemical composition was observed on the plasma-treated surface. Conclusions: Based on the results, non-thermal atmospheric pressure plasma could be a potential tool for the cementation of composite resin inlay.

• Bulletin of the Korean Chemical Society
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• 제35권9호
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• pp.2630-2634
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• 2014

The surface of natural graphite was modified by the use of hydrogen peroxide and evaluated as an anode material for lithium ion capacitors (LICs). The surface treatment was carried out under various ultrasonic conditions of 200, 300, and 400W, which were applied to a mixture of natural graphite and hydrogen peroxide solution for 1 h. While the bulk structure was maintained, the hexagonal symmetry and physical properties of natural graphite, such as BET surface area, tap density, and particle size, were affected by the surface treatment. FT-IR and XPS measurements confirmed the signature of C=O on the surface of graphite samples after treatment. Both the pristine and surface-treated graphites showed a similar reversible capacity of $370mAhg^{-1}$, and the coulombic efficiency of surface-treated graphite decreased with higher ultrasonic energies (89.1%, 89.0%, and 88.0% for 200, 300, and 400 W) comparing with pristine graphite (89.4%). The capacity retention of LICs was greatly improved with the treated natural graphite. The graphite treated under the ultrasonic energy of 300 W and pristine natural graphite showed capacity retention of 77.5% and 42.9%, implying that the surface treatment was an effective method for the improvement of natural graphite as an anode material for LICs.

• 한국표면공학회지
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• 제34권3호
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• pp.225-230
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• 2001

In this study, the effect of surface treatment of CFRP (Carbon Fiber Reinforced Composites) on the shear strength of CFRP/metal composites was investigated. The surface of 14 plied unidirectional (0-dog ) CFRP was treated by an $Ar^{/}$ + ion beam under an oxygen environment. Shear strength tests were performed using SLS (Single Lap Shear) specimens based on the ASTM D906-94a procedure. The shear strength of the surface-treated CFRP/metal composites was compared with that of the untreated CFRP/metal composites. The results showed that the shear strength of surface-treated CFRP/metal composites was 36% greater than that of untreated CFRP/metal composites.

• 한국염색가공학회지
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• 제18권1호
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• pp.20-27
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• 2006

On the purpose of surface modifications of polypropylene meltblown(PPMB) nonwovens, PPMB nonwovens were treated in the plasma system by oxygen atmosphere with different treatment time and discharge power. Dimensional change and physical properties of the treated nonwovens were evaluated. Contact angles onto PPMB nonwovens about water and methyleneiodide were measured and surface energies were calculated by Owen's method. As the results, microcraters were observed on the surface of treated nonwovens. Tenacity and breaking strain of PPMB nonwovens decreased with increasing treatment time and discharge power. Surface energy of PPMB nonwovens increased by plasma treatment. Meanwhile, the friction static voltage and dyeability of PPMB nonwovens have enhanced to some extent by oxygen plasma treatment due to the improvement of surface hydrophilicity.

• 분석과학
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• 제13권2호
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• pp.131-135
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• 2000

금속이 처리된 활성탄소섬유에 대한 물리 화학적 흡착특성과 항균효과에 대한 연구를 하였다. Cu가 처리된 활성탄소섬유에 관한 물리 흡착 연구에 의한 등온곡선으로부터 BET비표면적 값은 $688.2-887.8m^2/g$의 범위에 분포하였다. 또한 흡착 등온곡선으로부터 t-방법을 도입하여 미세 동공 부피 값과 동공의 평균 크기를 얻었다. SEM 연구로부터 활성탄소섬유의 많은 미세 동공들이 처리된 금속에 의하여 가리움 현상을 일으키는 것으로 나타났다. Escherichia coli에 대한 항균효과를 알아보기 위한 결과로부터 Cu의 양을 증가시켜 처리함에 따라 항균 활성 면적이 증가함을 하였다. 이들 결과로부터 금속이 처리된 활성탄소섬유에 대한 항균 메카니즘을 제시하였다.

• 대한치과보철학회지
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• 제29권2호
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• pp.117-127
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• 1991

The purpose of this study was to evaluate the effect of surface treatment of fractured metal-ceramic crown on bond strength of porcelain repair resin. The specimens were divided into two groups for metal specimens add five groups for porcelain specimens by surface treatment methods. the metal specimens were treated by 2 methods. : micro-sandblasting with $50{\mu}m$ aluminum oxide and grinding with diamond bur. The porcelain specimens were treated by 5 methods : micro-sandblasting with $50{\mu}m$ aluminum oxide, grinding with diamond bur, etching with porcelain etching agent, combination of micro-sandblasting and etching procedure, and combination of grinding and etching procedure. After surface treatment, each specimen was bonded with composite resin and the bond strength was measured and the surface texture was observed by scanning electromicroscope(SEM). The results were as follows : 1. There was significant difference in shear bond strength between metal specimen and prorcelain specimen. 2. Bood strength of metal specimens treated with diamond bur was higher than that treated with $50{\mu}m$ aluminum oxide sandblasting. 3. Bond strength of porcelain specimen treated with diamond bur was higher than that treated with $50{\mu}m$ aluminum oxide sandblasting and porcelain etching agent. 4. There was no significant difference in shear bond strength between the group treated with diamond bur and combined treatment groups respectively. 5. The large undercuts were observed in group treated with diamond bur by SEM.

• 한국표면공학회지
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• 제39권4호
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• pp.190-197
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• 2006

The effects of blasting and acidic treatment on the corrosion characteristics of dental implant fabricated with Cp-Ti and Ti-6Al-4V alloy have been researched by using electrochemical methods. The fabricated implants were cleaned and sandblasted by $Al_2O_3$ powder and then acidic treatment was carried out in nitric acid solution. The surface morphology were observed using scanning electron microscope. The corrosion behaviors were investigated using potentiosat and EIS in 0.9% NaCl solution at $36.5{\pm}1^{\circ}C$. The potentio-dynamic test in 0.9% NaCl indicated that the corrosion potential of blasting and acidic treated implant was lower than that of non treated implant, but current density was higher than that of non treated implant. From the cyclic potentiodynamic test results of Ti implant, the passivation current density of blasting and acidic treated implant slightly higher than that of non treated implant. From A.C. impedance test results in 0.9% NaCl solution, polarization resistance($R_p$) value of blasting and acidic treated implant was lower than that of non treated implant. In case of blasting and acidic treated implant surface, the pits were observed in valley and crest of implant surface.

• 한국의류학회지
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• 제29권3_4호
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• pp.561-568
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• 2005

The irradiation of Ultra-Violet (UV) is an efficient treatment for polymer to improve hydrophilic properties. 4-Channel PET knit fabrics were treated with UVA and UVC to develop functional and environment-friendly fabric. The fabric was treated with various treatment times and distances from UV lamps having different wavelength. FT-IR and XPS investigated the chemical changes. To confirm the change of surface properties, contact angle, surface energy and SEM were examined. The study of UV as a treatment for PET knit fabric shows significant changes in chemical and surface properties, which is proved by analyses. FT-IR and XPS analyses prove the augmentation of carboxylic, Hydrophilic groups on the surfaces treated by UV. The increase of water contact angle and surface energy means more water wettable and surface energy of PET film was substantially increased by UV irradiation time. The ageing after surface treatment had little influence on the surface energy of the irradiated PET film. SEM proves the surface modification of PET such as etching, bubble and crack. The negative effects are increased in accordance with increasing treatment time.