Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 19, Issue 1
Displaying 1-5 of 5 articles from this issue
  • Hidetachi Kato, Hideo Matsumura
    2001 Volume 19 Issue 1 Pages 1-6
    Published: April 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Porcelain laminate veneer restorations were applied for a patient with the chief complaint of esthetic dissatisfaction derived from her discolored crowding dentition. After completion of a limited orthodontic treatment, restorations were made on the refractory investment material using a feldspathic porcelain, and each surface to be seated was etched with hydrofluoric acid. Tooth preparation was performed within enamel, and the reduced surfaces were etched with phosphoric acid. The restorations were seated with the Clearfil Porcelain Bond silane bonding agent and the Clapearl DC dual cured luting agent. Although edge-to-edge bite was included reluctantly, the veneers have been functioning for more than five years without fracture or peeling. The clinical result suggests the effectiveness of the ceramic bonding system employed.
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  • Toshio Maseki, Sonoko Suda, Tetsu Kimishima, Yoichiro Nara, Hisayoshi ...
    2001 Volume 19 Issue 1 Pages 7-15
    Published: April 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to investigate the effectiveness of Conforcal Laser Scanning Microscope (CLSM) comparing with Scanning Electron Microscope (SEM) for the observation at the resin-dentin interface. Cervical dentin surfaces of 16 extracted human lower premolars were polished. The polished dentin surface was coated belt like with an etching protector, to distinguish the etched and non-etched area. Then the uncoated surface was treated by Single Bond (3M). The specimen was sectioned vertically, and the resin-dentin interface was polished with polishing powder. The resin-dentin interface was observed under CLSM and SEM. It seemed that in case of observing the resin-dentin interface, the advantages of CLSM was easy specimen making and less artifacts, compared to SEM. Observing the interface by CLSM, each layer of the adhesive, dentin and hybrid layer was discriminated clearly. Both observation apparatuses were equivalent in the apparent thickness of the decalcified dentin, thickness of the hybrid layer and distance from the untreated dentin surface to the upper side of the hybrid layer. It could be considered that CLSM is an effective apparatus for the observation and the quantitative measurement of the resin-dentin interfaces.
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  • Naotake Akimoto, Gen Yokoyama, Yasuko Momoi, Atsushi Kohno
    2001 Volume 19 Issue 1 Pages 16-25
    Published: April 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study was to evaluate the influence of non-resin impregnated layer on dentin adhesion both by the nanohardness (NH) measurement of resin-dentin interface as well as micro tensile bond strengths to human dentin surfaces using two new selfetching primer systems. Dentin discs were prepared from freshly extracted human third molars. Specimens were divided into two groups. Group 1; Dentin surfaces were treated using self-etching primer system. Unifil Bond (GC) or Clearfil MEGABOND (Kuraray) were applied per manufactures directions. Group 2; Dentin surfaces were etched with K-etchant (Kuraray) for 60 seconds, to intentionally over-etch the dentin substrate. Then dentin surfaces were treated with self-etching primer systems same as Group 1. NH of the resin-dentin interface was measured using an ENT-1100 Nanoindentation tester (Elionix). Micro tensile bond tests were performed on additional specimens after 24 hours. After both measurements, specimens were observed by SEM. Data were evaluated by one-way ANOVA, Fisher's PLSD test, p<0.01. Results showed that NH of 5, um towards the hybrid layer in Group 2 was significantly lower than Group 1. No significant difference in bond strength were showed between non-etched and etched dentin in each of the material groups. Although areas within 5gm from the border of hybrid layer appear demineralization, bond strength of self-etching primer systems after 24 hours were not affected by dentin etching.
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  • Extermination of Caries
    Nobuo Nakabayashi
    2001 Volume 19 Issue 1 Pages 26-37
    Published: April 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Hybridized dentin with resins could work well to bond prostheses to tooth structures. But the function must be more than the bonding of resin to dentin. It could resist acidic demineralization and proteolysis of collagen. The important function of enamel must protect dentin and pulp to keep tooth structure intact. Unfortunately dental hard tissues do not regenerate and do not have a healing process at the prepared surface. This deficiency must provide several problems to dental treatments, which we have not realized. Artificial enamel could be a technologically assisted healing process of dentin, which could certainly prevent infection of the tissue by microorganisms. We have not had such a highly advanced dental material before. Now we could challenge to exterminate caries by hybridization of tooth structure with adhesive resins.
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  • Effect on the Adhesion to Enamel
    Tohru Hayakawa, Kazuyo Kikutake, Kimiya Nemoto
    2001 Volume 19 Issue 1 Pages 38-47
    Published: April 15, 2001
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    In this study, the effectiveness of self-etching primer treatment on the adhesion between Superbond C&B, which is a 4-META/MMA-TBB resin, and enamel was investigated.
    As commercially available self-etching primers, Σprimer, Megabond primer and Macbond primer were used. The tensile bond strengths between Superbond C&B and bovine enamel treated with each self-etching primer was measured after 1 day immersion at 37°C water. The bond strengths by self-etching primer treatment were very high, and were almost same as those obtained by phosphoric acid etching. SEM observation revealed that the degree of decalcification of enamel by self-etching primer treatment is weaker than that by phosphoric acid etching. There was no clear relationship between the tensile bond strengths and degree of decalcification or degree of resin tags formation. It was suggested that another factor, besides anchorage factor, contribute the bond strength of Superbond C&B to enamel.
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