Adhesive Dentistry
Online ISSN : 2185-9566
Print ISSN : 0913-1655
ISSN-L : 0913-1655
Volume 11, Issue 4
Displaying 1-6 of 6 articles from this issue
  • (Report 1) Histopathological Change of the Pulp Tissue in Direct Capping
    Yoshiroh Katoh
    1993 Volume 11 Issue 4 Pages 199-211
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The purpose of this study is to investigate pulp-irritation and the direct pulp-capping effect of adhesives.
    Twenty-one teeth of 9 patients were subjected to this stufy. Under local anesthesia, each vital pulp of the tooth was exposed in diameter from between 1.2-2.2mm (m=1.7mm).
    They were pre-treated with 10% NaOCl Gel for 1-5min and chemical surgery. Direct capping with Ca (OH) 2 was undertaken in the control 4 teeth, and they were restored with Clearfil Photo Posterior (Kuraray). In the experimental group of 17 teeth, direct capping was undertaken on 10 teeth with Liner Bond System (Kuraray), 3 teeth with Super Bond C&B, Ivory (Sunmedical). Restored tooth were extracted after 37-194days (m= 79days), they were preserved for 2 months in 10% neutral buffered formaline solution and decalcified Serial paraffin sections were made and stained with Hamatoxylin-Eosin double stain and Van Gieson stain. Bacteria infection was examined by the Hucker-Conn stain method.
    Clinical unpleasant symptoms such as slight discomfort and cold water reaction were observed in 11 teeth (52%) immediately after the treatment, but they disappeared completely soon. Clinical complaints were not observed in 10 teeth (48%) which could functionate immediately after the treatment. After 3-4 weeks, medium range complaints such as discomfort and intermittent spontaneous pain appeared in 2 teeth (10%) which had been capped with Ca (OH) 2. Histopathologically, most of the pulp tissues were normal. Light inflammatory cell infiltration was observed in 3 teeth (14%). Collagen fiber network formation were observed in 18 teeth (86%), and dentin bridge formation was identified in 20 teeth (95%). Bacterial invasion was observed in 18 teeth (86%). None of the bacteria was identified in 3 teeth (14%), but these were of a short experimental duration, that is, only 37-38days. Adhesives did not give irritate pulp or it was extremely low. When pulp is protected by capping and restoration with an adhesive, collagen matrix and new dentine were formed on the exposed surface of the pulp and this should extend to the complete dentine bridge in the maturation process.
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  • Mitsuru Atsuta, Hideo Matsumura
    1993 Volume 11 Issue 4 Pages 212-217
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    One of the problems associated with education of resin-retained restorations inour country is lack of a typical educational guideline for the undergraduate level. Over the last several years, faculties of our department have given both lectures and clinicalinstructions on resin-bonded fixed restorations to the undergraduate students. This articledescribes educational procedure of prosthodontic adhesive systems giving in our facility. Clinical cases of restorations bonded with dental adhesive resins in the student clinic arepresented.
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  • Osamu Saitou, Takashi Nakamura, Takao Maruyama
    1993 Volume 11 Issue 4 Pages 218-223
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The use for adhesion bridge was recommended with conservative concept for missing teeth restoration for over ten years.
    In former, most of the clinical failure were caused by misunderstanding ofclinical indication and contraindication. By now, more understanding were taken, in addition with the development of adhesive material, the failure still occur. Those failure might cause from the inadequate knowledge of the different between adhesion bridge and conventional bridge in preparation design, material selection, surface treatment and cementing procedure.
    In this study, all those stated problems had been considered in order to reduce the clinical rate of failure.
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  • Takashi Nakamura, Toshizumi Hino, Takao Maruyama
    1993 Volume 11 Issue 4 Pages 224-228
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    The use of ceramic crowns are gradually increased in clinical application nowadays, by recent development of new ceramic materials i.e. high strength porcelain and castable ceramics.
    In this study, the mechanical investigations on anterior ceramic crown were evaluated by using 3-D finite element analysis. The effect of different loading direction and crown thickness were investigated.
    The results showed that the highest tensile stresses were caused in ceramic crown by the load at the incisal edge. In the crown with 0.5 mm thickness at axial wall, high tensile stresses were observed at wider regions of palatal side than in the crown with 0.75 and 1.0 mm thickness. However, in the case with an enamel layer remained on the surface of the abutment tooth, the stresses were reduced.
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  • Shigehisa Inokoshi, Masaaki Satoh, Hiroshi Gotoh, Naoto Katsube, Junji ...
    1993 Volume 11 Issue 4 Pages 229-236
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    Computer-aided design and computer-aided manufacturing (CAD/CAM) offers a new way to create tooth-coloured ceramic restorations. The Cerec CAD/CAM system became commercially available in 1988. This system consists of a relatively small mobile unit that enables the dentist to design and manufacture a ceramic inlay restoration chairside in a single appointment without laboratory assistance. The Cerec system has advantages over other indirect inlay systems. Ceramic inlays, either sintered or castable, require laboratory procedures, which are considerably time and labour-consuming. The Cerec system is unique in producing a ceramic inlay within one to two hours without laboratory support. The dentist should follow the exact procedures to maximise the capacity of the system. The marginal fit of Cerec restorations is still far from that provided by conventional gold inlays.
    Consequently, their success greatly depends upon the luting composite and bonding system used.
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  • Yoshihiro Toyoshima, Noboru Yasuda, Yoshiaki Nomura, Masashi Nisiki
    1993 Volume 11 Issue 4 Pages 237-243
    Published: November 30, 1993
    Released on J-STAGE: June 07, 2011
    JOURNAL FREE ACCESS
    We examined the percentages of the secondary caries and shedding of restoration in the patient's chief complaint at two dental clinics (Daimon Dental Clinic and Health Care Center of The Dai-ichi Mutual Life Insurance Company) in Tokyo. The numbers examined were 790 at Daimon Dental Clinic and 230 at Health Care Center Of The DMLI. They were 1020. The most numerous chief complaints were teeth deseases (64.5%). They included secondary caries (34.5%), shedding of restoretion (25.5%), primary caries (14.1%), and dental pulp disease (9.3%). Primary caries were often found in young patients. But secondary caries and shedding of restoretion were found in every generations. Correlative curves concerning with generation were similar in secondary caries and shedding of restoration. We could consider that the collapse of cementing system must induce secondary caries and shedding of restoration. 42% of the chief complaint and 71% of the patients discussed here had this type desease.
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