Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 16, Issue 3
Displaying 1-5 of 5 articles from this issue
  • Masahiro Nagai, Hongjun Ai, Takuya Sugita, Hiroo Miyairi, Noboru Yasud ...
    1998 Volume 16 Issue 3 Pages 125-134
    Published: August 31, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Fatigue crack propagating behaviors of two dental adhesive resins containing filler (PV) and non-filler (SB) were investigated in conjunction with the morphological observation of crack propagation area (CPA) by applying double cantilever beam testing to fatigue test under repeated constant displacement. The major findings were as follows. The fatigue crack propagating behavior was estimated by Pmax/[Pmax] o-n diagram at the process of fatigue crack propagation, and the diagrams of SB and PV were characerized as follows. In case of SB, the value of Pmax/[Pmax] o began to suddenly decrease when approached the value of about 0.95 regardless of loading levels (κ=0.5, 0.6, 0.7), however, in κ=0.3 and 0.4 the reduction of load was not shown to n=105 cycles. In case of PV, in Pmax/[Pmax] o-n diagrams for all loading levels (κ=0.7, 0.8, 0.9, 0.95) the load was decreasing slowly. Regarding fatigue CPA, in case of SB, a flat fracture surface was observed and was very different from a rough CPA observed in static test. Adn the area of flat fracture surface was expanded as value of κ became smaller. But, in κ=0.3 and 0.4, the fatigue CPAs were not observed. In case of PV, the fatigue CPA was similar to static CPA and were observed as the very small undulations.
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  • Influence of Air Drying of the Primed Enamel Surface on the Bond Strength to Bovine Enamel
    Kenji Takagaki
    1998 Volume 16 Issue 3 Pages 135-145
    Published: August 31, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    In an effort to simplify the bonding procedures, a self-etching primer system and a self-priming adhesive system have been introduced. Both systems employ primers to ensure maximum adhesion by improving monomer penetration into tooth structure. Proper application of primers plays an important role in getting good bond strength, but the effect of customary clinical application techniques of these primers is not well understood. The purpose of this study was to determine the influence of air syringe drying of the primed enamel surface on bond strength to bovine enamel. Three self-etching primer systems and four self-priming adhesive systems were employed. After treating the enamel surface with a primer, the surface was dried with compressed air for 0, 2, 5, 10, 20 and 30 seconds from 10 cm above the enamel surface using a three way syringe. Composite resins were condensed into a mold and light activated. The shear bond strength tests were carried out at a crosshead speed of 1.0 mm/min after 24 hours storage in 37°C water. The enamel bond strengths varied with air blowing times and ranged from 7.8 to 21.8 MPa. It was concluded that the enamel bond strengths of the bonding systems employd could be influenced by the drying time of the primer applied enamel surface and the tendency was different among the systems.
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  • Adhesion of resin-dentin bonding system Liner Bond II Σ
    Kousuke Itou, Yasuhiro Torii, Kazuomi Suzuki, Kiyoshi Inoue
    1998 Volume 16 Issue 3 Pages 146-151
    Published: August 31, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    In this study we evaluate the bonding efficacy of a newly developed adhesive system, Liner Bond II Σ(Kuraray, Japan) for multiple use such as resin composite filling and cementation of the restoration with resin cement. The system consists of a self-etching primerand the dual-cured bonding agent.
    Tensile bond strengths between tooth substances and resin composite were measured and resin-dentin interfaces were observed by SEM.
    The tensile bond strength promoted by Liner Bond II Σwas as strong as that promoted by Liner Bond II (Kuraray, Japan) and was not affected by 20, 000 thermocycles. SEM observation revealed that the hybrid layer in the dentin-resin interface was very thin (0.5 to 1.0μm).
    These results indicate that Liner Bond II Σ promotes good adhesion with thin hybrid layer.
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  • Kazuyo Kikutake, Tohru Hayakawa, Kimiya Nemoto
    1998 Volume 16 Issue 3 Pages 152-160
    Published: August 31, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    A water-soluble photoinitiator, QTX, was added into the self-etching Primer composed of Pheny1-P and HEMA, and the efficacy of the addition of QTX on the adhesion between composite resin and dentin was investigated.
    The polished bovine dentin surface was treated with self-etching primer containing QTX for 30sec. After drying, Clearfil Photobond (Kuraray) was applied. Then Clearfil AP-X (Kuraray) was filled and polymerized by the photo irradiation. The tensile bond strength was measured after 24hours immersion in37°C water. The addition of QTX into the 5%Phenyl-P/35%HEMA aqueous solution at the concentration of 0.5-3% increased the bond strengths about 6-7MPa. This value was almost twice the bond strength obtained without the addition of QTX. The addition of 3%QTX into the 30%Phenyl-P/35%HEMA aqueous solution also increased the bond strength about 14MPa.
    The hybrid layer, which was not dissolved by HCI immersion, was observed with a thickness of about2-3μm by SEM observation.
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  • Toru Nikaido
    1998 Volume 16 Issue 3 Pages 161-163
    Published: August 31, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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