Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 19, Issue 2
Displaying 1-11 of 11 articles from this issue
  • Kumiko Nozaka, Teruko Satoh, Eiichi Abe, Akiko Namioka
    2001 Volume 19 Issue 2 Pages 77-93
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    To study cavity compatibility for a composite resin inlay (CR inlay) of the second primary molars, several types of cavities were prepared and two plaster models were made. One model was used to examine the morphology of the cavity and the other to make the CR inlay (Kuraray CO., LTD.). After cementing the inlay with CR inlay cement, also using bonding materials, we investigated the compatibility of the inlay in the cavity by microleakage from the cavity margin and thickness of the cement line. As a result, angles within the cavity were round and 115-135 degrees in the mesio-distal direction. The angle of the bucco-lingual side wall to the occlusal surface was 65-70 degrees. Microleakage was often seen at the cavity with round and straight bevels, and at the angles of the pulpal, axial and gingival walls. Moreover, microleakage was also seen at the CR inlay over 1.7 mm in thickness and at the area with the wider cement line. Cement line was thicker in the slice cut cavity than the box form. In conclusion, the cavity with a butt joint, under 1.3-1.5 mm in thickness of CR inlay and a box form with smooth angles contributes positively to the compatibility of the CR inlay for the second primary molars.
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  • Part 1. Elastic Deformation of Mineralized Dentine
    Kunio Wakasa, Hidehiko Sano
    2001 Volume 19 Issue 2 Pages 94-101
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the stress and strain relation of mineralized dentine by micro-tensile test and to clarify the elastic behaviour theoretically.First, it was discussed about the meaning of shear and tensile test in the bond testing, and secondly the conventional shear and tensile bonding tests of dental adhesive systems were considered, and both a micro-shear bond test and a bond test with miniaturized dumbbell-shaped specimen which had limited bonded area were clarified. Third, the meaning of micro-tensile test with the same dimension of micro-tensile bond test was also given. These results indicate that the elastic behaviour of mineralized dentine as collagen fibre/apatite composite was evaluated by the value given in present study, even though the behaviour of dentine matrix was not measured. The effect of the orientation of dentinal tubule with respect to stress direction on the strength of dentine can be given, because the effect of dentinal tubule on elastic deformation was evaluated.
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  • Ayuko Umino, Takako Yoshikawa, Saori Yamaguchi, Junji Tagami
    2001 Volume 19 Issue 2 Pages 102-109
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the effect of light curing methods on the marginal sealing and cavity wall adaptation of resin composite restorations, and on the hardness at the top and bottom surfaces of a body of resin composite. Cylindrical cavities, 1 mm deep and 3 mm in diameter (C-factor=2.3) were prepared on flat bovine dentin surfaces. The teeth were restored with UniFil Bond adhesive system followed by UniFil S composite. The resins were cured with NEW LIGHT VL-II (VL-II) and Co-bee (CB) curing lights; Group 1: VL-II 700 mW/cm2 for 60 5, Group 2: CB 730 mW/cm2 for 60 5, Group 3: CB 210 mW/cm2 ramped to 700 mW/cm2 over 5 s + 700 mW/cm2 for 55 s. After thermocycling, dye penetration tests around the cavity margin and cavity wall adaptation on cut surface were carried out. Dye penetration length was calculated as a percentage of the total cavity wall length. Composite specimens of 2 mm and 3 mm thickness were polymerized in Teflon molds with three curing lights, and then the top and bottom surfaces hardness were measured using Knoop hardness tester. The ramped curing significantly improved marginal sealing of resin composite restorations. This curing method caused accelelrating the hardening at the bottom surfaces of the resin composite.
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  • Kana Chikami, Junichi Doi, Tomiko Yamada, Yosihiro Nishitani, Kousuke ...
    2001 Volume 19 Issue 2 Pages 110-116
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to examine the adhesive property of three flowable resin bonding systems to root carious dentin using a micro-tensile bond strength test (MTBS test) and a scanning electron microscope (SEM), so as to investigate the possibility of clinical application of modified-sealed restoration to root carious dentin. As flowable resin, Palfique Estelite LV, Wave and FASMY10 (an experimental resin) were used. As bonding systems, One-up Bond F, Stae and UniFil Bond were used for each flowable resin. Freshly-extracted human canines with mild root dentin caries were used in this study, and polished dentin surfaces including the areas which were stained as pink by caries-detector in central occlusal portions surrounded with normal dentin were prepared. Each bonding system was applied to the polished and flowable resin was built up and polymerized and subjected to the MTBS test. SEM observation was also carried out. The result of MTBS test revealed that three flowable resin bonding systems could show high bond strengths to coronal normal dentin, but that the bond strengths of their systems to root caries-infected dentin were significantly lower than that to coronal normal dentin. The SEM observation suggested that the hybrid layer formation could be observed in normal dentin. However, in root carious dentin, hybrid layer could not be seen clearly, and beneath the adhesive interfaces bacteria-like structures were embedded.
    These results suggested that the adhesive property to root carious dentin should be improved to establish modified-sealed restoration to root carious dentin.
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  • Yuka Takano, Toru Nikaido, Junji Tagami
    2001 Volume 19 Issue 2 Pages 117-124
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The resin-coating technique is unique, in which the prepared cavity is sealed with a bonding system and a low viscosity micro-filled resin after cavity preparation, but just before taking an impression. The purpose of this study was to evaluate the influence of impression materials, such as hydrocolloid and silicone rubber (condensation/addition types) on the surface characteristics of resin-coating materials; Protect Liner F and SB Coat. From the results of this study the super fine surface was obtained only with the hydrocolloid impression material. The fine surface was obtained with the condensation type silicone rubber impression material. However, contamination of the resin-coating materials from the addition type silicone rubber impression materials was observed. The surface changes were material dependent. In conclusion, the hydrocolloid impression material is good for use with the resin-coating technique.
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  • A Comparison between Sodium Hypochlorite Solution and Gel
    Atsushi Mine, Eishin Fujita, Kazumi Watanabe, Eiji Ohnishi, Takushi Ka ...
    2001 Volume 19 Issue 2 Pages 125-132
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Previous studies demonstrated higher bond strengths and durability between an adhesive resin cement and deep dentin, when 10% sodium hypochlorite solution was used to remove the dentin collagen exposed by phosphoric acid etching on the adherent surface. On the other hand, 10% sodium hypochlorite gel that contains a bodying agent to improve the ease of use in clinics has been developed and released in the market. However, its effect on adhesion to intra-radicular deep dentin has been insufficiently examined so far. In this study, therefore, we compared the conditioning effects of sodium hypochlorite solution and gel on intra-radicular deep dentin.
    Shear bond strength values and scanning electron microscopy images of adhered surfaces were obtained before and after 5, 000 and 10, 000 thermal cycles. The results showed that the gel could not remove sufficiently the organic substances on the dentin adherent surface, even when the treatment time was elongated, resulting in a decrease in bond strength durability. We could conclude that the solution is more effective than the gel as pre-conditioning agent in deep dentin.
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  • Akihiko Mizutani, Noriko Hotta, Hiroyuki Ishikawa, Takami Itoh, Tadao ...
    2001 Volume 19 Issue 2 Pages 133-139
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    To investigate the influence of the contamination on the enamel bonding, the bond strength of the chemical-cured glass ionomer cement to polished or etched enamel with contamination was measured. The bond strengths to polished enamel covered with contaminant (water: 10.9 MPa, saliva: 12.3 MPa, blood: 7.2 MPa) were significantly lower than that of the control (15.1 MPa). And, the bond strengths to etched enamel covered with contaminant (water: 17.2 MPa, saliva: 16.7 MPa, blood: 9.4 MPa) were also significantly lower than that of the control (19.9 MPa). The blood contamination reduced the bond strength to enamel than water and saliva contamination regardless of enamel surface treatment. Although the contaminants reduced the bond strengths of glass ionomer cement, the values were comparable to clinical required bond strength. In the case of control, water and saliva contamination, SEM micrographs revealed that samples of polished enamel had the mixed fracture pattern of bracket-cement and enamel-cement interface failure and the specimens of etched enamel mainly had the bracket-cement interface failure. For the blood contamination, the cohesive fracture of the glass ionomer cement was observed regardless of the enamel surface treatment. These results showed that the chemical-cured glass ionomer cement is available for orthodontic clinical use.
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  • Yasuo Morohoshi
    2001 Volume 19 Issue 2 Pages 140-147
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Esthetically Pleasing Restoration of Tooth Decay with Adhesive Composite
    Shigehisa Inokoshi
    2001 Volume 19 Issue 2 Pages 148-150
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Super-Bond (4-META/MMA-TBBresin)
    Mitsuo Nakamura
    2001 Volume 19 Issue 2 Pages 151-157
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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  • Aim at Gentle Treatment for Dentin and Pulp
    Hideto Takahashi
    2001 Volume 19 Issue 2 Pages 158-169
    Published: August 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
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