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  • Title/Summary/Keyword: Bonding Adhesives

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A SHEAR BOND STRENGTH OF RESIN CEMENT BONDED TO HUMAN UNCUT ENAMEL, CUT ENAMEL, AND DENTIN IN VITRO

  • Lee Jong-Yeop
    • The Journal of Korean Academy of Prosthodontics
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    • v.41 no.3
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    • pp.319-324
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    • 2003
  • Statement of problem. Adhesives in dentistry playa major role in the success of restorative treatments. In the treatment of all ceramic restoration it is needed to find the adequate bond strength between enamel and dentin. Purpose. The purpose of this study was to evaluate shear bond strength of resin cement bonded to extracted human uncut enamel, cut enamel, and dentin in vitro. Material and methods. Ten freshly extracted anterior teeth without any previous restorative treatments were chosen. The extracted teeth were embedded in PMMA cold acrylic in the shape of a cylinder, 25 mm in diameter by 25 mm in height. The bonding system used was as follow: Uni-Etch (32% phosphoric acid), One-Step adhesive, Duolink resin cement. The specimens were acid etched and rinsed with water. Two layers of One-Step adhesive were coated with a disposable brush on the uncut enamel. VIP curing light at 500mV/cm2 was used to cure the adhesive. For cut enamel shear bond test, the specimen used for uncut enamel was further reduced approximately 0.30.5mm using a laminate preparation diamond bur (0.3 mm in depth). The specimens were subsequently treated with 320-grit SiC paper followed by 600-grit SiC paper and cleaned with distilled water. The bonding procedure on the cut enamel was same as uncut enamel bonding procedure. For dentin bonding test, the specimen used for cut enamel was further reduced approximately 0.5mm1.0mm using a laminate preparation diamond bur (0.5 mm in depth of diamond cutting). The amount of reduction was evaluated with the silicone mold. The specimens were subsequently treated with 320-grit SiC paper followed by 600-grit silicon carbon paper and cleaned in distilled water. The bonding procedure on the dentin was same as uncut enamel bonding procedure. All samples were mounted and secured on the Ultradent shear bond test sample holder, and Ultradent restricted shear bond testing device was used with Universal Instron machine until fracture. Analysis of variance (ANOVA) test was performed comparing the result at P<0.05. Multiple comparison (Tukey) was used to compare each groups. Result. The result showed that the mean value in shear bond strength of resin cement bonded to uncut enamel, cut enamel and dentin were 27.04 Mpa, 30.25 Mpa and 26.39 Mpa with respect. Conclusion. Within the limitation of this study, the mean value of the shear bond strength of cut enamel was higher than those of uncut enamel or dentin. However there existed no statistical differences between three different human dentition substrates due to increased adhesive characteristics.

Characteristics of Adhesive bonded Joints of Steels for Automobile(I) (자동차용 강판의 접착특성 - 접착부위 접합 강도와 영향인자 -)

  • 윤병현;권영각
    • Journal of Welding and Joining
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    • v.13 no.2
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    • pp.106-114
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    • 1995
  • The characteristics of adhesive bonded joint of steels for automobile were investigated. Shear and tear strength were tested and analyzed for the joints of cold rolled steel sheets bonded with three kinds of epoxy and urethane based adhesive. The results showed that the tensile shear strength and the tear strength of adhesive joint were affected by the shape of adhesive joint such as the length and width of adhesive joint. The thickness of adhesive layer was very important factor affecting the bonding strength. The shear strength increased with decrease of the thickness of adhesive layer, while the tear strength decreased as the thickness of adhesive layer decreased. In comparison with the strength of spot welded joint, the shear strength of adhesive Joint was higher than that of spot welded joint, but the tear strength of adhesive Joint was lower than that of spot welded joint.

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Design and Manufacture of Composite Machine Tool Structures for High Speed Milling Machines (고속 밀링 머신용 복합재료 이송부의 설계와 제작)

  • 서정도;김학성;김종민;최진경;이대길
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.05a
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    • pp.223-226
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    • 2002
  • To maximize the productivity in machining molds and dies, machine tools should operate at high speeds. However, the productivity of mold manufacturing has not increased significantly because CNC milling machines have massive slides, which do not allow rapid acceleration and deceleration during the frequent starts/stops encountered in machining molds and dies. This paper presents the use of composites for these slides to overcome this limitation. The vertical and horizontal slides of a large CNC machine were constructed by bonding high-modulus carbon-fiber epoxy composite sandwiches to welded steel structures using adhesives. These composite structures reduced the weight of the vertical and horizontal slides by 34% and 26%, respectively, and increased damping by 1.5 to 5.7 times without sacrificing the stiffness. Without much tuning, this machine had a positional accuracy of ±5μm per 300 m of the slide displacement.

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Strength Evaluation of Adhesively Bonded Single-Lap Joints by Ultrasonic Signal Analysis (초음파신호해석을 이용한 단순겹치기 접착이음의 강도평가)

  • Oh Seung-Kyu;Jang Chul-Sub;Han Jun-Young;Lee Won
    • Journal of Welding and Joining
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    • v.22 no.5
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    • pp.32-37
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    • 2004
  • Application of bonding by adhesives can be found in many industries, particularly in advanced technological domains such as aeronautical and space, automobile and electronics industries. Periodic inspection with conventional ultrasonic NDE techniques is capable of indicating the presence and possible location of crack. Continuous ultrasonic attenuation monitoring has potential to supply information. This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between metal sheets. The method is based on the measurement of the reflection coefficient at the metal/adhesive interface. By means of a control experiment it is shown that Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Fracture Testing.

Reaction Study of Tannin with Formaldehyde in the Adhesive Containing Condensed Tannin (Condensed Tannin을 포함한 접착제에서 Tannin과 Formaldehyde의 반응에 관한 연구)

  • 정경호
    • Textile Coloration and Finishing
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    • v.4 no.3
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    • pp.116-121
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    • 1992
  • This paper is on for a material to replace the petroleum-based resins used as adhesives for the fiber in rubber composite materials. The study limited to the reaction properties of tannin with formaldehyde. Tannin-formaldehyde(TF) reactions were carried out in aqueous media. Rates of reaction were strongly dependent on concentration, temperature, pH, and the mole ratio of tannin to formaldehyde. Viscosities of reaction mixtures were followed up to gelation. The reactivity of tannin-formaldehyde resins was greater than that of resorcinol-formaldehyde resins. To formulate an adhesive, a styrene-butadiene-vinyl pyridine terpolymer latex(L) was added to the TF. This preliminary results suggest that the condensed tannins have considerable promise as substitutes for resorcinol used in resin formulation for bonding of fiber to rubber.

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Esthetic restoration of upper anterior teeth by porcelain laminate veneer (도재 라미네이트 비니어를 이용한 상악 전치부의 심미적 수복)

  • Oh, Sang-Chun;Shin, Young-Ho
    • Journal of Dental Rehabilitation and Applied Science
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    • v.19 no.1
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    • pp.35-41
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    • 2003
  • With the understanding of tooth crown biomechanics and the progress of dentin adhesives, bonded porcelain restorations including a porcelain laminate veneer present an extended spectrum of indications for anterior teeth. Porcelain laminate veneer as a restoration offers the conservative solution that balances the functional and esthetic needs of the anterior dentition. Porcelain's stiffness, its surface characteristics, and the biomechanical strength achieved through bonding to tooth surface enable the restoration of the tooth as a whole supporting occlusal force and masticatory function. Namely, the optical effects inherent in the tooth and the lifelike features of the porcelain make that this restoration approaches the ultimate in esthetic satisfaction for both the dentist and the patient. A 49-year-old female patient with the incisal discoloration of upper central incisors and black triangle between the central incisors was referred to correct her esthetic problems with prosthodontic approach. The patient was satisfied with two porcelain laminate veneers that were made according to prof. Magne and Belser's recommendation.

Nondestructive Strength Evaluation of Adhesive-Bonded Single-Lap Joints by Signal Processing Method (신호처리기법을 이용한 단순겹치기 접착이음의 비파괴적 강도평가)

  • Jeong, Il-Hwa;O, Seung-Kyu;Hwang, Yeong-Taik;Jang, Chul-Seob;Jeong, Eui-Seob;Yi, Won
    • Proceedings of the KSME Conference
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    • 2001.06a
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    • pp.541-546
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    • 2001
  • Application of bonding by adhesives can be found in many industries, particularly in advanced technological domains such as the aeronautical and space industries, automobile manufacture, and electronics. Periodic inspection with conventional ultrasonic NDE techniques is capable of indicating the presence and possible location of crack. Continuous ultrasonic attenuation monitoring has potential to supply information. This study used adhesive-bonded single-lap joints specimen to evaluate such possibility by ultrasonic signal processing method.

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A Study on the Development of Automatic Welding System using Solor Energy (태양에너지를 이용한 자동용접 시스템 개발에 관한 연구)

  • Kim I.S.;Kim O.S.;Son J.S.;Seo J.H.
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.532-533
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    • 2006
  • In this research work attempts were made to study the bonding of thermoplastics with adhesives using solar energy. In order to study the curing behaviour necessary experiments were conducted under varying conditions of temperature, exposure time and power. The cured samples were then studied under the optical microscope before subjecting to tensile testing in order to study their mechanical properties. The fracture surfaces were further studied under the Scanning Electron Microscopy in order to study the microstructural changes that are taken place during curing. From the present study it is evident that curing under higher solar energy temperature, generally improves bond strength and quality of the adhesive joints when compared to other modes of curing process expect the microwave curing process.

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Effects of filler addition to bonding agents on shear bond strength

  • Oh, Young;Park, Kyung-Won;Oh, Myoung-Hwan;Um, Chung-Moon
    • Proceedings of the KACD Conference
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    • 2001.11a
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    • pp.559.2-559
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    • 2001
  • Fanning et al.(1995) suggested that the incorporation of filler particles into a system's adhesive could increase the shear bond strength by improving the mechanical properties. In this study, shear bond strengths of experimental filled adhesives with varying filler levels were tested to determine the optimal filler level. The diametrile tensile strength and thickness of each experimental adhesive were also examined to evaluate if there is a relation between shear bond strength and mechanical properties of adhesive.(omitted)

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A Robot System for Attaching Fixers to a TV Cabinet (이형 제품 간 접합 공정 로봇 시스템)

  • Kim, Dong-Hyeon;Park, Sang-Sin;Sung, Young-Whee
    • The Journal of Korea Robotics Society
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    • v.6 no.2
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    • pp.141-146
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    • 2011
  • In the TV manufacturing industry, a demand for chic design of TVs is increasing. As a reult of this trend in TV design, more curved surfaces in a TV cabinet are introduced, which enforces the use of fixers to combine a front cabinet with a TV main body. In this paper, we introduce a robot system for attaching various types of fixers to a TV cabinet. The developed system consists of three main blocks. The first one is the dispensing block, in which transferred cabinet is centered and UV adhesives are dispensed on the cabinet. The second one is the fixer attaching block, in which a cabinet is centered again and fixers are attached to pre-determined places on a cabinet by a robot with several end effectors. The last one is the UV hardening block, in which very strong ultraviolet rays are applied to the cabinet for attaching fixers tightly to the cabinet. The developed system is successfully adopted in a TV manufacturing process.