• Title/Summary/Keyword: 표면 착색

Search Result 75, Processing Time 0.028 seconds

Surface roughness and color stability of various composite resins (수종의 복합 레진의 표면 거칠기와 색 안정성)

  • Lee, Sung-Yi;Kim, Hyeon-Cheol;Hur, Bock;Park, Jeong-Kil
    • Restorative Dentistry and Endodontics
    • /
    • v.32 no.6
    • /
    • pp.542-549
    • /
    • 2007
  • The purpose of this study was to evaluate the difference in the surface roughness after polishing and to evaluate the difference in color stability after immersion in a dye solution among four types of composite resin materials. Four light-polymerized composite resins(Shade A2) with different sized filler content(a nanofilled, a hybrid, a microfilled, a flowble) were used. Average surface roughness (Ra) was measured with a surface roughness tester (Surftest Formtracer) before and after polishing with aluminum oxide abrasive discs(Super-Snap). Color of specimens before and after staining with 2% methylene blue solution were measured using spectrophotometer(CM-3700d) with SCI geometries. The results of Ra and ${\Delta}E$ were analyzed by one-way analysis of variance(ANOVA), a Scheffe multiple comparison test and Student t-test(p=0.05). After polishing, Ra values were decreased regardless of type of composite resins. In surface roughness after polishing and color stability after staining, nanofilled composite resin was not different with other composite resins except flowable resins.

Degradation characteristics of the FRP material for using as a PCB substrate (PCB 기판용 FRP 재료의 열화특성)

  • Park Jong Kwan
    • Journal of the Institute of Electronics Engineers of Korea SD
    • /
    • v.41 no.12
    • /
    • pp.1-6
    • /
    • 2004
  • In this study, heat and discharge treatments are arbitrary simulated for finding out the initiations and processes of surface degradation on the surface of polymer for using as a PCB substrate. Thermal-treatment changed the surface to the hydrophobic one with the increase of contact angle and surface potential decay, respectively. The XPS spectrum showed that the increased hydrophobicity in thermal treatment was originated from the continuous decrease of side-chains caused by secessions of oxygen groups and the increase of unsaturated double bond in carbon chains. Also, thermal-treatment caused the discoloration on the point of treated surface. These phenomena were attributed to the generation of ether group. In the chemical change by discharge treatment, a lot of side-chains occurred on the treated surface, and so the hydrophilicity increased as time elapsed.

Erosive Effect and Color of Mouthrinsing Solutions on Enamel Surface (시판중인 구강양치용액의 법랑질 표면의 착색과 침식에 미치는 영향)

  • Jeong, Kyung-Yi;Lee, Hye-Jin;Park, Young-Nam
    • Journal of dental hygiene science
    • /
    • v.11 no.5
    • /
    • pp.397-404
    • /
    • 2011
  • The aims of this study were to evaluate the effect of native acidity upon dental hard tissues by measuring pH in mouth-rinse, which is on the market, and to evaluate even influence of dental stain caused by mouse-rinse given using for a long time. The experimental group was used Garglin, Nextcare, Listerine, and Hexamedin. The control group was used sterile distilled water. As a result, pH was indicated to be low in Nextcare(4.70) and Listerine(4.16). In a change of color tone, $b^*$ value of indicating Yellow-blue showed the lower value than the early color tone in all groups. There was statistical significance in Nextcare and Listerine. ${\Delta}L^*$ value of indicating light -dark gets darker after using Nextcare, Listerine and Hexamedine. A change(VHN) in surface hardness of enamel showed reduction in surface hardness after 14 days in Nexcare and Listerine. As a result of confirming a change in enamel surface by using Scanning Electron Microscopy, the erosion aspect on the enamel surface could be confirmed in groups of Nexcare and Listerine. Ra value in surface roughness of enamel could be observed the enamel surface, which got rougher compared to other experimental groups.

Anatomical Changes and Anthocyanin Contents of the Exocarp by Ethyl Oleate Treatment on 'Merlot' Grapes (Ethyl oleate 처리에 의한 'Merlot' 포도 과피의 안토시아닌 함량과 해부학적 변화)

  • Lee, Byul-Ha-Na;Kwon, Yong-Hee;Shin, Kyoung-Hee;Park, Hee-Seung
    • Horticultural Science & Technology
    • /
    • v.28 no.3
    • /
    • pp.370-373
    • /
    • 2010
  • Preharvest treatment with 4% ethyl oleate on 'Merlot' ($Vitis$ $vinifera$ L.) grape reduced the thickness of the epidermal and hypodermal layers with significantly enhanced pigmentation. Thickness of the skin in treated berries was $90-107{\mu}m$, whereas those in control berries were $126-189{\mu}m$. Decreases in the thickness of epidermal and hypodermal cell layers seemed to be due to cellular death or dehydration by rapid senescence after the treatment. Immediate change observed in treated berries was the deformation of the wax that appeared melted resulting in color improvement. Total anthocyanin was also increased by ethyl oleate treatment. Separate forms of anthocyanins, acylated and methoxylated anthocyanins increased, whereas hydroxylated anthocyanins tended to decrease.

Charactristice of a colored Galvanized Coating using Ti-Zn Alloy System (Zn-Ti계용융아연 도금강판의 착색화 특성)

  • 전선호
    • Journal of the Korean institute of surface engineering
    • /
    • v.30 no.5
    • /
    • pp.320-332
    • /
    • 1997
  • The development of colored surface on zinc coating by the oxidation of a melten alloy of zinc with a minor amount of oxygen-avid additive such as tianium has been studied. Using a galvanizing Zinc alloy containing 0.1 to 0.3wt%Ti, gold, purple or blue color was developed clearly and stably, depending upon the extent of oxidation, by air cooling after hot dipping in a bath at temperature of $550^{\circ}C$ to $600^{\circ}C$. The source of the color is light interference with surface oxide layer. THe final color depends on the thickness of the color depends on the thickness of $TiO_2$, played So compositing, temperature and time at elevated temperature after are all controlling variables. Since oxidation film such as $TiO_2$ played role of passivation film, the corrosion resistance in a colored galvanized steel sheet. It is also thought that surface oxide layer of $TiO_2$ inhibited dissolution of the coating layer.

  • PDF

A Study on the Coloring of 304 Stainless Steel Screen for Reducing Light Reflectivity (304스테인리스강 스크린의 광 반사율 감소를 위한 착색 처리에 관한 연구)

  • Kim, Ki-Ho
    • Journal of the Korean institute of surface engineering
    • /
    • v.43 no.4
    • /
    • pp.187-193
    • /
    • 2010
  • The colored films formed on 304 stainless steel plates by immersion treatment and electrochemical one in a solution containing sulphuric acids and chromic acids were studied by SEM, AES, and spectrophotometer. The thicknesses of the films by 20 minutes treatment were about 200 nm and it became thinner as the treatment times were increased. The surface texture showed a tortuous network of interlinking pathways. The color of the 304 steel surface changed from metallic white to gray, black, red, yellow-green, and green-blue, gradually, by the treatment time was increased. The reflectivity measured by UV-VIS-NIR spectrophotometer was reduced from max. 38% of basis metal to min. 3.5% of colored surface.

Electrocoloring during Anodic Oxidation of 6063 Aluminium Alloy (알루미늄 양극산화 피막의 전해착색에 관한 연구)

  • 정순오;한성호;백영현
    • Journal of the Korean institute of surface engineering
    • /
    • v.33 no.5
    • /
    • pp.309-318
    • /
    • 2000
  • The 6063 Aluminium alloy were electrocolored and anodized at the same time in addition of $CoSO_4$, $FeSO_4$, in the electrolyte and investigated by AES/SAM. It was found that the thickness of anodic oxide film is increased linearly in DC type, and DC combined AC type, the more ratio of anodic Portion in AC, the more increased of anodic film thickness. The color of anodic film was changed from silver to yellow when the increase of the ratio of cathodic portion in AC. Also the increase of $CoSO_4$, $FeSO_4$ in the electrolyte, the coloring time is decreased. From the AES/SAM results, the element of anodic oxide film are Al,O and S. The result of depth profile, the most of the S distributed on the surface and the more S is in DC combined AC type than only DC type.

  • PDF

The Effect of Circle Contact Lens on the Stability of Tear Film (써클콘택트렌즈가 눈물막 안정성에 미치는 영향)

  • Lee, Sehee;Hyung, Sung Min;Koh, Seung Hwan;Park, Mijung;Kim, So Ra
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.20 no.2
    • /
    • pp.125-131
    • /
    • 2015
  • Purpose: The effect of pigmentation in circle contact lens on lens wearers' tear film stability was investigated in this study. Methods: Non-invasive tear film break-up times of 54 normal eyes before and after lens wearing in twenties and the portion of first tear breakup were measured. The frontal and back surface roughness of circle contact lens was further observed with a scanning electron microscope. The clear lens which was made of hilafilcon B and circle contact lenses which were made of hilafilcon B, polymacon and copolymer of HEMA NVP were tested. Results: Non-invasive tear film breakup time was significantly reduced compared with it before lens wearing. In some case, statistically significant difference in tear film breakup time was also observed between circle contact lenses. The tear file break-up was usually early started in lower than upper portion, and in temporal than nasal portion although there was variation in the lens material. The tear film break-up of circle contact lenses made of hilafilcon B was more commonly observed in peripheral portion(pigmented area) compared with clear contact lens made of same material. Conclusions: The present study revealed that the stability of tear film was affected by wearing circle contact lens and the result seems to be used as the basis for the problem solving that can occur due to the pigmentation when wearing circle contact lens.

Evaluation of Surface Condition and Food Solution on the Color Stability of Dental Restoration Materials (표면 상태와 용액에 따른 치과용 수복재료의 색안정도 평가)

  • Woo, Hee-Sun;Kim, Hyo-Jin;Jun, Soo-Kyung
    • The Journal of the Korea Contents Association
    • /
    • v.19 no.4
    • /
    • pp.359-367
    • /
    • 2019
  • For this study, specimens were prepared using five types of composite resin and resin-reinforced glass ionomer Fuji II LC, and 29 days precipitation was done in four kinds of solution, which were soy sauce, gochujang, wine, and distilled water. Ten specimens for each coloring sample were divided into two groups, one those surfaces was polyester film and the other with 1200-grit abrasive paper, and 20 specimens per materials. Color change (${\Delta}{\ast}ab$) in the colored specimens is measured in 2days, 7days, 14days and 29days using spectrophotometer (CM-2600d, Konica, Minolta, Ramsey, NJ). All values were considered significant when P<0.05. 1. Each material is discolored over time under the influence of different storage solutions. 2. In soy source, among the specimens polished with polyester film, color change was observed in resin-modified glass ionomer Fuji II LC, prodigy and compomer F-2000 on day 2. Meanwhile, Fuji II LC showed noticeable color change in specimens prepared with 1200-grit sandpaper on day 2, which was followed by flowable resin on day 7. 3. On day 2, there was a color change with the specimens of flowable resin, resin-modified glass ionomer Fuji II LC and Prodigy among the hybrid specimen in the groups of polyester film in gochujang.

A Comparative Study on the Local Transmittance Homogeneity of the Ocular Lens (안경 렌즈의 국소적 투과율 균일도 비교 연구)

  • Park, Sang-Kook;Ri, Hyeong-Cheol;Jang, Yun-Seog;Sung, Duk-Yong;Kang, Sung-Soo
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.20 no.4
    • /
    • pp.471-476
    • /
    • 2015
  • Purpose: We have analyzed the transmittance distribution of various ocular lenses using local transmittance microscope to investigate the optical homogeneity of the lens. Methods: The local transmittance of the laser which is focused on the surface of the spectacle lens was measured by using the photo-detector, lock-in amplifier and motorized-stage. 25 multi-coated lenses with non-tinted of 5 groups and 45 multicoated lenses with tinted of 9 groups were analyzed as a sample respectively. Results: Average and deviation of local transmittance for nontinted lenses were measured almost uniformly with various refractive index and coating. However, deviation of transmittance of for tinted lenses was analyzed as about 3.7 times larger than that of non-tinted lenses. Inhomogeneity of local transmittance of for tinted lenses was also analyzed as about 3.1 times larger than that of non-tinted lenses. Conclusions: We could analyze that standard deviation of transmittance and inhomogeneity of local transmittance of for tinted lenses is larger than that of non-tinted lenses using the local transmittance microscope. These analysis using local transmittance microscope can be utilized as a way to evaluate lens performance and improve optical homogeneity.