Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 24, Issue 2
Displaying 1-4 of 4 articles from this issue
  • Xiaohua ZHAO, Masahiro YOSHIYAMA
    2006 Volume 24 Issue 2 Pages 67-74
    Published: August 15, 2006
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The aim of this study was to evaluate the adhesive properties to carious dentin of two fluoride-releasing onestep adhesive systems: a newly developed adhesive systems (Fluoro Bond Shake One, FB) and a commercial adhesive system (Reactmer Bond, RB), and RB was used as control. Human extracted molars with mild occlusal caries were stained with a caries detecting solution and ground perpendicularly to the long axis of the tooth to expose the flat dentin surfaces. The dentin surfaces were classified into sound dentin (SD), caries-affected dentin (CAD) and caries-infected dentin (CID) groups by the degree of staining. Each adhesive system was applied to the surfaces, and a composite resin was built up and polymerized. After immersion in water for24hours, a microtensile bond strength test was carried out. SEM observation was also performed to evaluate the morphology of resin-dentin interfaces. The bond strengths of the two adhesive systems to CAD and CID were significantly lower than those to SD, but no significance was found between two systems for each dentin type. SEM observation showed the hybrid layers and resin tags in CAD and CID were more porous and irregular than those in SD. After thermocycling for10, 000times, the bond strengths to the intact bovine dentin did not significantly decreased for both systems. The results suggested the adhesive property of FB was equal to RB.
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  • Shuichi ITO, Takashi SAITO
    2006 Volume 24 Issue 2 Pages 75-82
    Published: August 15, 2006
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this work was to determine an influence of resin-dentin interfaces when specimens was incubated in Clostridium collagenase using microtensile bond test. Superficial occlusal dentin of fifty extracted human molars was used. An all-in-one adhesive, iBond (iB) and a total-etch adhesive One Step Plus (OSP) were applied to dentin surfaces according to the manufacturer's instructions. OSP was applied to dentin that was acid etched for15vs 60 sec etching. AP-X composite was used to create resin composite buildups for both adhesives. After24hours storage in37°C water, the teeth were sectioned to produce beams with0.9mm2cross-sectional areas for microtensile testing. The beams bonded specimens were stored in0.006% Clostridium collagenase solution or control buffer for1, 14or30days. Microtensile bond test was performed, and data were evaluated by two-way ANOVA (material vs. etching time) followed by multiple comparisons at α=0.05. For the OSP adhesive system, the tensile bond strength of specimens acid-etched for15sec showed no significant differences until30days periods. However, the OSP bond strengths of specimens acid-etched for60sec showed significantly decrease when they were stored for30days in collagenase solution, but not in control solution. In the specimens bonded with iBond, there was no decrease in bond strength in either the control or the collagenase groups over30days. Clostridium collagenase had no effect on resin-dentin bond strengths with iBond treated specimens, and only lowered bond strengths in One Step Plus bonded specimens if they were over-etched.
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  • Takatsumi IKEDA, Satoshi INOUE, Yasuko NAKAOKI, Hidehiko SANO
    2006 Volume 24 Issue 2 Pages 83-87
    Published: August 15, 2006
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of the present study was to evaluate ultimate tensile strengths (UTSs) of bonding agents from three 2-step self-etching systems (Clearfil Mega Bond: MB, Fluoro Bond: FB and Unifil Bond: UB) immediately after light-curing. UTSs of the three bonding agents were evaluated at three periods: immediately after irradiation for the bonding agents, immediately after irradiation for a composite resin and 24hours later from irradiation for the bonding agents. Regarding difference in the bonding agents, MB indicated the largest UTS and followed by FB and UB. As for the difference in the three periods, UTS increased from immediately after irradiation for the bonding agents to24hours later from irradiation for the bonding agents. At immediately after the irradiation for the bonding agents, degree of conversion might be low, and further conversion might be progressed by the irradiation for the composite resin and post-irradiation hardening of the bonding agents.
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  • Part I: Physical and flexural properties
    Toshiki TAKAMIZAWA, Kanako YAMAGUCHI, Satoshi UEKUSA, Toru MAEDA, Taka ...
    2006 Volume 24 Issue 2 Pages 88-94
    Published: August 15, 2006
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Provisional restorations are used to restore interim between tooth preparation and fitting a definitive restoration, and to ensure the patient continues to functional, and esthetic restorations. Recently, newly developed paste-type provisional resins, which include inorganic filler, have been available. Though the newly developed might have advantages, little is known about their physical and mechanical properties. The purpose of this study was to evaluate the filler contents, thermal expansion, and water sorption as well as flexural properties of paste-type resins and compare those of PMMA resins. Filler contents of provisional resins ranged from0.1to52.2wt%, and significant higher filler contents were found for paste-type resins. Thermal expansion of the provisional resins ranged from75.4to102.0×10-6/°C and water sorption ranged from15.2to23.5μg/mm3. From the results of this study, flexural strength ranged from54.1to82.3MPa and Young's modulus ranged1.60to3.24GPa. The SEM observation revealed that various sizes and shapes of filler were included in paste-type resins.
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