Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 11, Issue 1
Displaying 1-5 of 5 articles from this issue
  • Kazuo Kondo, Masato Hotta, Hiroaki Sobajima, Yoshiko Kasahara, Takeshi ...
    1993 Volume 11 Issue 1 Pages 1-8
    Published: February 27, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of the present study was to evaluate the tensile bond strength of composite resin to the light-cured glas-sionomer cement surface with and without compressed air-drying after acid etching. A second purpose of this study was to evaluate with scanning electron microscopy the bonding/cement interface and to characterize with the fracture surface following the tensile bond test.
    As a results, the most effective surface conditions were found in the drying treatment group. The bonding/cement interface is smooth and slightly rough. There is very close contact between the cement and bonding agent. Fractured surface after tensile bond test showed that the failure always occured cohesisvely with in the cement (XR-Ionome®, XR-Ionomer Hard set®, Fuji lining LC®), however, Vitrabond® surface showed interface failures. The direct tensile strength of the light-cured glass-ionomer cement used in this study has been found to be about 30-70kgf/cm2
    Download PDF (1702K)
  • Pulpal Response and Observation of Contact Area between Composite Resin and Dentinal Wall
    Yuichi Nakazawa, Tatsuya Ishikawa
    1993 Volume 11 Issue 1 Pages 9-18
    Published: February 27, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this experiment was to investigate the pulpal reaction to a composite resin restoration with a NPG primer and a bonding agent containing a carboxylate adhesive monomer, PMDM. The contact area between a composite resin with the monomer and dentinal cavity wall was observed through SEM imaging.
    In the histo-pathological study, the average evaluation score of pathological results in group M (the composite resin restoration using the NPG primer and the bonding agent containing PMDM monomer “Mirage-Bond”) was excellent and almost the same as in group P (the composite resin restoration using a bonding agent “Clearfil Photo Bond” after enamel and dentin wall etching with 40% phosphoric acid). But pathological result scores of dispersion in group M were very narrower than in group P. Microorganism growth in group M was less than in group P. Gaps caused by exfoliation in the part of contact area between the resin restoration and dentin cavity wall were observed through SEM imaging, and number of exfoliated cases in group M were less than in group P. But gaps in group M were narrower in width than in group P. In SEM imaging, microorganisms were observed in most cases having gap areas. Consequently the pulpal irritation due to this composite resin restoration system with the NPG primer and the PMDM monomer was generally minor and the system was considered to be safety and useful comparatively even though the contraction gaps were founded in some cases.
    Download PDF (2488K)
  • Junji Tagami, Masatoshi Nakajima, Tsunekazu Shono, Michael F. Burrow, ...
    1993 Volume 11 Issue 1 Pages 19-24
    Published: February 27, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Tensile bond strengths of various adhesive resin materials to the occlusal, proximal and labial dentin in molars, premolars and incisors extracted from young or aged patients were compared and the resin-dentin interfaces of each materials and dentin were also observed under SEM after the argon ion etching. When Clearfil Photobond was used, occlusal dentin of the old molar demonstrated much higher bond strenghts than that of the young dentin. This is considered to be caused by the difference of the dentin permeability due to the increasing tubule occlusion with aging. The resin impregnated layer (RIP) formed in the young dentin was thinner compared with the depth of the decalcified layer (DCL), though the RIP in old dentin showed the same thickness as the DCL. This may be caused by the difference in maturation of the collagen fibers with aging, such as increase of cross linking. On the other hand, the proximal dentin showed the similar bond strengths to young and old teeth. When the other bonding systems containing various kinds of dentin primer were used, the aging of dentin did not show any effect on bond strengths. The primer application seems to have covered the effect of aging.
    Download PDF (1479K)
  • Shigehisa Inokoshi, Choltacha Harnirattisai, Yasushi Shimada, Hiroyasu ...
    1993 Volume 11 Issue 1 Pages 25-32
    Published: February 27, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    At the interface between an adhesive composite resin and dentin after caries removal and acid etching with 37% phosphoric acid gel for 60 seconds, the hybrid layer between the adhesive resin and surface-demineralized dentin was found to be wider in the area of empty tubules (mean=5.53μm) compared with that of the occluded tubules (mean=2.92μm), and was found to be the thinnest at the lateral walls of the cavity where the dentinal tubules run parallel to the cavity surface.
    At the interface between an adhesive composite resin and dentinal walls of cervical erosion/abrasion lesions etched with 37% phosphoric acid gel for 60 seconds, almost all dentinal tubules were occluded with rod like structural depositions which remained undissolved even after acid conditioning. The hybrid layer between the adhesive resin and surface-demineralized dentin was found to be 0.3 to 3μm, much thinner than that of either normal dentin or caries affected dentin. The hybrid layer was thinnest at the occlusal walls of the cavity where the dentinal tubules run parallel to the cavity surface. Thus, the bond strength of adhesive resin to carious dentin and sclerotic dentin might be different from that to intact normal dentin.
    Download PDF (2082K)
  • Part 2. Adhesion Bridge
    Yoshihiro Toyoshima, Noboru Yasuda, Yoshiaki Nomura, Masashi Nishiki
    1993 Volume 11 Issue 1 Pages 33-40
    Published: February 27, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    We investigated about the adhesive dentistry by sending questionnairesto many general practitioners in all over Japan. We recieved answers from 274 persons. The results of answers about dental cements and restorative composite resinswere reported on the last number. This time we report about an adhesion bridge. 67% of thedentists answerd that they had used adhesion bridges. And 60% of those usersanswerd that they have been still using this method. 40% of the usens are not using today.The dentists who gave up this method are found in the group who have a long clinicalcareerand tested this method before 1985. The dentists still using adhesion bridgeswellunderstand how to deal the metal surface. They have various types of clinical evaluation aboutthe adhesion bridge. Many of them have following point of views. It requiresconsiderations about an adaptation and a retention to succeed the adhesion bridge. Before 1985 ithad been said that the adhesion bridge should not set on dentin substances, only limited onenamels. In recently many clinical researches suggesting the direct bonding on the dentins by adhesive resin materials were reported. We resulted that it needs to revalue thepossibility of the adhesion bridge bonding on the dentin.
    Download PDF (806K)
feedback
Top