Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 16, Issue 1
Displaying 1-5 of 5 articles from this issue
  • Cohesive Strength of the Dentinoenamel Junction
    Isao Urabe, Hidehiko Sano, Shigehisa Inokoshi, Junji Tagami
    1998 Volume 16 Issue 1 Pages 1-6
    Published: February 27, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Dentinoenamel junction (DEJ) can be regarded as a biological adhesion interface between enamel and dentin. The adhesion in this portion will be the future goal of resin bonding systems. By means of micro tensile test, we measured the cohesive strength of the DEJ. The results showed that the cohesive strength of bovine and human DEJ were 47.7 MPa and 51.5 MPa, respectively. Since the tensile bond strength of the newest resin bonding system (40-50 MPa) have achieved the level of the cohesive strength of human DEJ (51.5 MPa), it may be thought that current resin bonding systems can reproduce biological adhesion within a short term. However, SEM observation revealed that the structure of DEJ is highly complicated and suggested the formation of hybrid with enamel and dentin. In the future, it will be important to simulate the biological adhesion achieved at the DEJ, and improve in the quality of the adhesive interphase.
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  • Akio Yoshimoto, Atsushi Yamashita, Yasuhiro Kondo, Hirofumi Yatani
    1998 Volume 16 Issue 1 Pages 7-17
    Published: February 27, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The aim of this study was to evaluate a newly developed metal primer (Kuraray). We investigated how the primer application on the adherent metal surface affected the tensile bond strength between metals and adhesive resin cement before and after thermal cycling between (4°C/60°C), and how the two different application methods affected on the strength measurements. The contact angle of the primer was also measured. Two kinds of dental alloy, i. e., gold alloy and goldsilver-palladium alloy, were used for fabricating the test specimens and the specimens were cemented with Panavia 21 resin cement (Kuraray).
    By applying the primer on sandblasted metal surfaces, the bond strengths, regardless of metal type, significantly increased. The bond strengths did not decrease, even after adding 10, 000 times thermal cycling presenting a high level of durability. However, the application on non-sandblasted surfaces resulted in very poor durability. The contact angle analysis likely showed better wet properties of the resin cement to the metal surface on which the primer was applied, but once it was overapplied, it gave rise to a significant decrease in bond strength. In the results, the primer application was effective to increase the bond strength between the resin cement and the metal regardless of metals used, but the primer should always be applied on sandblasted metal surfaces.
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  • Shigehisa Inokoshi
    1998 Volume 16 Issue 1 Pages 18-23
    Published: February 27, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Adhesive resins enable us to protect the dental pulp from bacterial leakage, and give us an opportunity to preserve the dental pulp of caries tooth with deep caries lesion. Prognosis of direct pulp capping with adhesive resins must be compromised by including clinical cases, which were not indicated for direct pulp capping and were difficult to perform proper clinical procedures. Clinical criteria for diagnosis of dental pulp and indication of direct pulp must be clarified in order to obtain better clinical performance of direct pulp capping. We can use adhesive resins for direct pulp capping, if the dental pulp is exposed in the cavity without remaining carious dentin, and control of hemorrhage and marginal seal are secured.
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  • Adaptation of the Composite Resin Filling to Cavity Walls
    Masakazu Takizawa, Tetsuya Amagai, Ken Takahashi, Eiji Seino, Yasuaki ...
    1998 Volume 16 Issue 1 Pages 24-33
    Published: February 27, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to investigate the application of Er: YAG laser for cavity preparation and the composite resin restoration (Clearfil AP-X with Clearfil Liner Bond II).The adaptation of the composite resin filling to cavity walls was observed by dye penetration test and scanning electron microscopy (SEM).Using a SEM, a stomatal opening of dentinal tubule was observed, but a smear layer and dentinal plug were not identified on the dentin surface irradiated by Er: YAG laser. When Er: YAG laser ablation and high-speed rotation cutting by air turbine handpiece were compared, signigicant difference was not recognized in the marginal sealing of enamel and the composite resin, also dentin and resin were obiously bonded.These results indicate that Er: YAG laser used with water supply for cavity preparation may be safe to the adaptability to the composite resin restoration used in this study.
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  • Shigehisa Inokoshi
    1998 Volume 16 Issue 1 Pages 34-38
    Published: February 27, 1998
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The adhesion bridge is an excellent technique for restoring short span edentulous part. Several techniques have been introduced for this purpose. However, the adhesion bridge using metal retainer sometimes causes esthetic failures. Direct bonding of artificial acrylic tooth with an unfilled bonding resin fails to replace posterior missing tooth. The adhesion bridge using only composite resin materials have technical difficulty in fabrication, and lacks in mechanical property for posterior restorations. An adhesive reinforcing fiber “ Ribbond” may offer an optional technique for construction tooth colored adhesion bridges for anterior and posterior edentulous part. This paper introduces composite resin adhesion bridge using a reinforcing adhesive fiber “Ribbond”.
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