Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 17, Issue 1
Displaying 1-11 of 11 articles from this issue
  • Durability of Enamel Bond Strength of 2-Step Bonding Systems
    Mikitake Sato
    1999 Volume 17 Issue 1 Pages 1-11
    Published: February 28, 1999
    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 priming adhesive system have been introduced. There are few published studies about the durability of enamel bond strengths of these simplified bonding systems. The purpose of this study was to determine the durability of the bond created by several newly developed 2-step bonding systems to bovine enamel. The experimental design included measurement of shear bond strength and fracture mode following thermal cycling which is a method of simulating the long-term effects of temperature change in oral environment. Also the morphological integrity of the resin-enamel interface was examined by means of scanning electron microscopic observations. The results suggested that bond strength durability of 2-step bonding systems was different between self-etching primer systems and priming adhesive systems.
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  • Shigeru Hirabayashi, Tadashi Hirasawa
    1999 Volume 17 Issue 1 Pages 12-22
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The effects of pretreatment with an experimental ‹Phytic acid-SnF2› primer, which requires a 2-step treatment with 7% phytic acid solution and then with 3% SnF2 solution, on the bonding durability of Clearfil Photo Bond to bovine dentin were evaluated by thermal cycling test (4-60°C, each for lmin.). The result was compared with those of pretreatment with 10-3 solution, which contained 10% citric acid and 3% FeCl3, and K-etchant. In addition, the effect of additional treatment with 35% HEMA aqueous solution was also examined.
    The shear bond strength after 20, 000 thermocycles was about 9 and 6 MPa for experimental primer and 10-3 solution, respectively. These values were almost equal to the initial bond strength. However, the bond strength for K-etchant decreased to about 4 MPa even after 5, 000 thermocycles. When the additional HEMA treatment was performed, the bond strength after 20, 000 thermocycles increased to about 14, 10 and 8 MPa for experimental primer, 10-3 solution and K-etchant, respectively. SEM observation of resin-dentin interfaces revealed that the width of hybrid layer expanded in all cases by the second HEMA treatment after each pretreatment. This suggests that the monomer permeability of demineralized dentin was improved by the additional HEMA treatment.
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  • Hideo Matsumura, Takako Ide, Naomi Tanoue, Mitsuru Atsuta
    1999 Volume 17 Issue 1 Pages 23-28
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The influence of alloy composition, priming, and thermocycling on bond strength to silver-palladium-copper-gold alloy was evaluated in vitro by means of shear testing. Disk specimens with two different diameters were cast from three commercially available (S12, S20 and Castwell M. C. 12) and four experimental silver-palladium-copper-gold alloys (KB1, KB2, KB3 and KB4), each of the latter containing copper more than 20%. Specimens were either unprimed or primed with a metal conditioner (V-Primer), bonded with an adhesive resin (Super-Bond Opaque), then shear testing was performed. The results showed that the low-copper S12 and S20 alloys showed lower post-thermocycling bond strength than the Castwell alloy regardless application of the conditioning agent. Post-thermocycling bond strengths of the primed KB1, KB2, KB3 and KB4 alloys were the same magnitude as that of the Castwell alloy. For all groups except for one (S12, without thermocycling), bond strength was elevated by use of the metal surface conditioner. Application of thermal stress drastically reduced bond strength of unprimed groups, whereas bond strength of the two primed groups (KB1 and KB2) was unaffected by thermocycling.
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  • Comparison of Three Dentin Surface Conditions
    Naotake Akimoto, Gen Yokoyama, Charles F Cox, Shiro Suzuki, Atsushi Ko ...
    1999 Volume 17 Issue 1 Pages 29-32
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the micro tensile bond strengths to human dentin surfaces using two new self-etching primer systems. A smear layer using 180 and 600-grit and smear-layer-free dentin surfaces were prepared from freshly extracted human third molars. Dentin surfaces were treated with a newly developed self-etching primer system “CLEARFIL MEGABOND”. One bottle Primer was applied for 20 sec. and gently air dried, bonding agent applied, gently air dispersed and light cured. Clearfil AP-X was placed per manufactures directions. For control, dentin surfaces were treated using Linerbond II Σ. All materials were provided by Kuraray Co. Osaka, Japan. Micro tensile bond tests were performed after 24 hours. Data were evaluated by one-way ANOVA, Fisher's PLSD test, p<0.01. There were no significant differences among the tensile bond strength data. It is concluded that the new self-etching primer systems were not affected by dentin surface condition.
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  • Seiichiro Fujisawa
    1999 Volume 17 Issue 1 Pages 33-38
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Our object was to determine whether an ionic binding interaction between the 4-META resin system and brushite is detected by high-resolution proton-1 nuclear magnetic resonance spectroscopy (1H-NMR). An increased porous surface area on tooth enamel surface is made by etching and furthermore brushite (dicalciumphosphate dihydride) is generated by etching enamel or hydroxyapatite. Brushite would not be washed away completely and 4-META was rapidly converted to 4-MET in clinical situation. The 1H-NMR signals of the methacryloyloxyethyl group of 4-MET remained intact following the addition of both brushite and monocalcium phosphate solution, whereas those of its phthalic portion were markedly shifted upfield (about 0.1 ppm). The shielding effect followed by upfield shifts is due to the localization of electron density surrounding the carboxylate anions that were dissociated by the interaction with calcium counter cation. A polymerization ability of 4-MET seems to be unaffected with the interaction of calcium. An ionic interaction of 4-MET derived from 4-META with calcium was demonstrated.
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  • Masaaki Satoh, Hiroshi Kobori, Takeshi Suzuki, Katsuaki Iwami, Norihik ...
    1999 Volume 17 Issue 1 Pages 39-44
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate hygroscopic expansion of class III restorations of tooth-colored materials.
    Fuji II LC, Fuji Lute (GC), Vitremer (3M) and SR-5111, Xeno (sankin) were used. Fifty extracted human anterior teeth were used firstly to prepare. The flat mesio-proximal surfaces were made by diamond disk and 600-grit silicon carbide paper. Then, a saucer type class III cavities with 3mm diameter and lmm depth were prepared in the distal proximal surfaces.
    Ten restorations were prepared for each material either coated or uncoated. Distance between flat surface and most distal point of the restoration was measured with micrometer immediately, 2 and 4 weeks after immersion in distilled water.
    The results were as follows.
    1. Hygroscopic expansion was recognized for all the materials with Xeno minimum.
    2. Application of coating material (finishing gloss) failed to prevent an initial hygroscopic expansion of the restorations.
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  • Influence of Difference of Wiping Techniques on Cement Line Area
    Mika Nemoto, Yoshikazu Kawamoto, Yoshiyuki Tamura, Yoshiyuki Kakehashi ...
    1999 Volume 17 Issue 1 Pages 45-52
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the influence of difference of wiping excess resin cement techniques on the state around the cement area.
    Extracted bovine mandibular incisors were prepared and luted with a dual-cured resin cement to ceramic inlays.
    Cement area was observed with laser microscope and SEM after wiping excess resin cement using cotton pellets, a dental explorer and small brush.
    The finding were as follows: Wiping excess resin cement with cotton pellets caused a layer of resin cement to be dragged out of the gap and leaving a defect.
    The resin cement was removed superfluously or dragged out with dental explorer.
    Using small brush, the state of resin cement area is variously depending on a direction to move or an angle to teeth surface.
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  • Yoshiroh Katoh
    1999 Volume 17 Issue 1 Pages 53-55
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Junji Tagami, Yuichi Kitasako, Hidekazu Sonoda, Masayuki Otsuki, Shige ...
    1999 Volume 17 Issue 1 Pages 56-60
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Kohichi Kota
    1999 Volume 17 Issue 1 Pages 61-66
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Akira Manabe
    1999 Volume 17 Issue 1 Pages 67-71
    Published: February 28, 1999
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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