• Title/Summary/Keyword: Acrylic Fiber

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COMPARISON OF FRACTURE STRENGTH AND PATTERN OF ENDODONTICALLY TREATED TEETH RESTORED WITH FIBER POSTS AND METAL CAST POST (섬유강화 포스트와 금속주조 포스트의 파절강도 밋 파절양상의 비교)

  • Kim Mee-Kyung;Kim Seok-Gyu
    • The Journal of Korean Academy of Prosthodontics
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    • v.42 no.5
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    • pp.535-543
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    • 2004
  • Purpose: The purpose of this study is to compare the effect of two fiber post systems and one metal cast post system on the fracture strength and fracture pattern of crowned, endodontically treated teeth with 2 mm-height of the reamining tooth structure. Materials and methods: A total of 36 recently extracted sound human mandibular premolars were selected Each tooth structure of the crown portion except 2mm-height of the one above the cementoenamel junction was removed. After being endodontically treated, they were randomly distributed into 3 groups: group 1, restored with quarts fiber post(D.T. Light-Post), group 2, with glass fiber post(FRC Postec), and group 3, metal cast post and core. All teeth were fully covered with nonprecious metal crowns. Each specimen was embedded in an acrylic resin block and then secured in a universal load-testing machine. A compressive load was applied at a 130 degree angle to the long axis of the tooth until fractured, at a crosshead speed 20mm/min. The highest fracture loads were measured and recorded as the fracture strength of each specimen. Fracture areas were measured on the mid-buccal and mid-lingual point from the crown margins. One-way analysis of variance and Turkey test were used to determine the statistic significance of the different fracture loads and areas among the groups (p<0.05). Results: The mean fracture loads were $1391{\pm}$425N(group 1), $1458{\pm}476N$(group 2) and $1301{\pm}319N$(group 3). The fracture loads among the three groups had no statistically signifiant difference (p>.05). The mean fracture area of the fiber post was closer to the crown margin than that of the metal cast post and core(p<.05). The metal cast post showed unrestorable and catastrophic fracture patterns. Conclusion: Within the limitations of this study, fracture loads with any statistically significant difference were not recorded for endodontically treated teeth restored with two fiber posts and the metal cast post. But teeth restored with the fiber posts typically showed the fracture pattern close to the crown margin, which was almost restorable.

In vitro study of microleakage of endodontically treated teeth restored with different adhesive systems and fiber-reinforced posts (다양한 접착시스템을 이용하여 섬유 강화형 포스트로 수복한 치아에서의 미세누출에 관한 연구)

  • Park, Joon-Ho;Choi, Yu-Sung
    • The Journal of Korean Academy of Prosthodontics
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    • v.52 no.2
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    • pp.74-81
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    • 2014
  • Purpose: While studies have examined microleakage in endodontically treated teeth restored with posts, microleakage among post and adhesive systems remains a concern. This study compared the sealing properties of 3 adhesively luted post systems. Materials and methods: Thirty-six endodontically treated permanent maxillary central incisors were divided into 3 groups: Zirconia-glass fiber, Quartz-glass fiber, Polyethylene fiber posts. Post space was prepared and each post was adhesively luted with 3 systems. The specimens were separately immersed in freshly prepared 2% methylene blue solution for 1 week. The cleaned specimens were then embedded in autopolymerizing acrylic resin. The root portion of tooth were horizontally sectioned into three pieces (apical, middle, and coronal portions). An occlusal view of each section was digitally photographed with a stereomicroscope. The methylene blue-infiltrated surface for each specimen was measured. Dye penetration was estimated as the ratio of the methylene blue-infiltrated surface to the total dentin surface. Results: No significant differences were found among post types. The variables of middle section and 3-stage adhesive produced significant differences in microleakage between the following post pairs: zirconia-glass fiber versus quartz-glass fiber, zirconia-glass fiber versus polyethylene fiber, and quartz-glass fiber versus polyethylene fiber (P<.05). There were significant differences between the apical and coronal sections of each post type, and between apical versus middle sections of quarze-glass fiber and polyethylene fiber posts (P<.05). Conclusion: No significant differences were found among post types. The 3-stage adhesive produced significant differences in microleakage between the following post pairs.

Synthesis of Acrylic Pressure-Sensitive Adhesive by Emulsion Polymerization (유화중합에 의한 수성 아크릴계 접착제의 합성)

  • Kim, Dong-yeub
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.1
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    • pp.45-50
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    • 2006
  • In order to analyse the properties of the fiber-adhesive that was used as Flocking process we synthesized quaterpolymer with the variation of the types of monomer ratio by emulsion polymerization. We characterized the properties of this adhesive: Differential Scanning Calorimeter(DSC), Thermogravimetry Analysis(TGA), Raman spectroscopy. The polymer was synthesized by changing the using amount of 2-EHAM, and then we investigated the characteristics of glass transition temperature(Tg), melting temperature(Tm), thermal stability and hydroxyl group respectively. The optimum monomer composition was 36.84% EAM, 15.79% MAM, 42.1% 2-EHAM and 5.26% AAc.

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A Study on the Synthesis of Durable Antistatic Agent Using Water Soluble Polymers and Amines (수용성고분자와 아민을 이용한 내구성 대전방지제 개발에 관한 연구)

  • Park, Sang-Woo;Lee, Suk-Young;Seo, Mal-Young;Seo, Jang-Hyuk;Shin, Yong-Sub;Koo, Gang
    • Textile Coloration and Finishing
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    • v.13 no.6
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    • pp.413-427
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    • 2001
  • In this studs, we synthesized durable antistatic agents with acrylic monomers for preventing the electrification of static electricity which is one of defects of polyester fabrics. Also we synthesized quaternary ammonium salts which give antistatic property and crosslinking agents which make antistatic agents adhere to fiber. The treatment of synthesized antistatic agents on polyester fabric carried out at the condition of various concentrations, treatment times and temperatures. The antistatic property, handle characteristics and other properties of treated and untreated polyester fabrics were also investigated.

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A Study on the Synthesis of Durable Antistatic Agent Using Water Soluble Polymers and Amines (수용성고분자와 아민을 이용한 내구성 대전방지제 개발에 관한 연구)

  • Park, Seong U;Lee, Seok Yeong;Seo, Mal Yong;Seo, Jang Hyeok;Sin, Yong Seop;Gu, Gang
    • Textile Coloration and Finishing
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    • v.13 no.6
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    • pp.55-55
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    • 2001
  • In this study, we synthesized durable antistatic agents with acrylic monomers for preventing the electrification of static electricity which is one of defects of polyester fabrics. Also we synthesized quaternary ammonium salts which give antistatic property and crosslinking agents which make antistatic agents adhere to fiber. The treatment of synthesized antistatic agents on polyester fabric carried out at the condition of various concentrations, treatment times and temperatures. The antistatic property, handle characteristics and other properties of treated and untreated polyester fabrics were also investigated.

A Study on the Character of the Emulsified Water Repellents of Acrylic Copolymer and Additives (아크릴 공중합체형(共重合體型) 유화발수제(乳化撥水劑)의 특성(特性)에 관(關)한 연구(硏究))

  • Park, Hong-Soo
    • Journal of the Korean Applied Science and Technology
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    • v.5 no.1
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    • pp.63-70
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    • 1988
  • The quaternized compound of the copolymer between 2-diethylaminoethyl methacrylate and stearyl methacrylate (DSACC) was chosen as the mother resin for the water repellent of acrylics. The quaternized compound of 1-lauroyl dis (amino ethyl)-2-dodecyl imidazoline (LDDIC) was used to promote softening effect and hydrostatic pressure for the water repellent. The water repellent (EDUWC) obtained from the DSACC and LDDIC blended with waxes and emulsifiers improved the properties such as the water repellency, washable, tear strength and crease recovery when it was treated on the nylon fabrics with and without the resin. The reaction mechanism between the Nylon fiber and EDLWC was examined, and EDLWC was confirmed as the durable water repellent.

Synthesis and Characterization of Sodium Acrylate and 2-Acrylamido-2- Methylpropane Sulphonate (AMPS) Copolymer Gels

  • Jassal, Manjeet;Chattopadhyay, Ritwik;Ganguly, Debojyoti
    • Fibers and Polymers
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    • v.5 no.2
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    • pp.95-104
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    • 2004
  • A series of superabsorbents based on acrylic acid (AA), sodium acrylate, 2-acrylamido-2-methylpropane sulphonic acid, N,N'-methylene bis-acrylamide (MBA) were prepared by inverse suspension polymerization. These hydrogels were further crosslinked on the surface with polyethylene glycol-600 (PEG-600). The water absorbency or swelling behaviors for these xerogels in water and 0.9% saline solutions, both under free condition and under load were investigated. Absorption characteristics of these hydrogels were found to depend on nature and concentration of crosslinker in the system. It was also found that the saline absorption was significantly improved as the incorporation of AMPS in the polymer was increased. The surface crosslinking introduced in the polymers was found to improve the absorption under load characteristics without lowering the free water absorption capacities of the polymer to a considerable extent.

Improvement of Interfacial Adhesion of Metal Plated Synthetic Fabrics for Electromagnetic Wave Shielding by Using Cold Plasma (저온 플라즈마 처리에 의한 전자파 차폐성 금속화 합성섬유의 계면 밀착성 개선)

  • 천태일
    • Textile Coloration and Finishing
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    • v.10 no.2
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    • pp.8-17
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    • 1998
  • In this study we have examined electroless chemical plating on the plasma grafted poly [ethylene terephathalate](PET) fabric in order to improve the interfacial adhesion between metal and fiber. The vapour phase of acrylic acid introduced on the PET surface and the graft polymerization was carried out by using cold plasma, resulting in the grafting yield of 0.8-1.3 wt%. The carboxyl group of the plasma grafted was identified by FT-IR-ATR spectra. The Interfacial adhesion was related to the carboxyl group. After electroless chemical plating of nickel, it showed that the more the carboxyl, the better the interfacial adhesion. Comparing to the untreated, the plasma grafted fabric showed fairly good interfacial adhesion(5B grade, ASTM D3359) . The shielding effect of electromagnetic wave showed 95dB. The shielding effect depends on the fabric structure, the surface structure, and the cross sectional shape of fibers. The dense fabric structure, the etched surface like a microcrater, and the trigonal cross sectional shape were prefered.

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Effect of Binder's Concentration and Fiber Type on Mechanical Properties of Fragrant Fabrics (마이크로캡슐을 이용한 방향가공시 바인더 농도 및 섬유 종류에 따른 물성)

  • 김혜림;송화순
    • Journal of the Korean Society of Clothing and Textiles
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    • v.28 no.7
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    • pp.1029-1036
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    • 2004
  • The fragrant fabrics were prepared by treatment with eucalyptus microcapsules. 100% cotton fabric, 100% polyester fabric and 100% wool fabric were used as test specimens. Using pad-dry-cure method, microcapsules were attached on each specimen by acrylic binder under conditions of varying concentration. Surface property, stiffness, and air permeability of fragrant fabrics were evaluated. As increasing concentration of binder, add-on yield was increased. Add-on yield was decreased with increasing laundering cycle, especially in polyester fabric. As the concentration of binder was increased, the properties of stiffness and air permeability were decreased. Also it fumed out that pad-dry-cure method was not suitable to polyester fabric.

Prototyping and Field Application of Light Emotion Friendly Concrete with Pattern Design (패턴 디자인이 적용된 LEFC 시제품 제작 및 현장적용)

  • Seo, Seung-Hoon;Kim, Soo-Yeon;Kim, Byoung-Il
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.05a
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    • pp.203-204
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    • 2019
  • Recently, exposed concrete designs have been placed everywhere due to increased interest in indoor residential environments. In addition, in order to overcome the disadvantages of litracon, which was developed by mixing optical fiber, LEFC(Light Emotion Friendly Concrete) was developed in Korea, which improved unit price and constructivity by inserting hard acrylic rods. LEFC, using foaming agent and lightweight aggregate for light weighting, has disadvantages that decrease mechanical properties, and thus improved mechanical properties by using ultra-high performance concrete. Also, due to the characteristics of UHPC materials, it showed excellent self-consolidating performance. Considering these characteristics, a LEFC mold with pattern design was developed. The LEFC blocks were built so that pattern shapes could be seen and these were applied on-site to Sewoon plaza, located in Seoul.

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