Asian Pacific Journal of Dentistry
Online ISSN : 2185-3487
Print ISSN : 2185-3479
Volume 12, Issue 1
Displaying 1-5 of 5 articles from this issue
  • Fumihiko Mori, Noriko Hiraishi, Masayuki Otsuki, Junji Tagami
    2012 Volume 12 Issue 1 Pages 1-5
    Published: 2012
    Released on J-STAGE: October 06, 2024
    JOURNAL FREE ACCESS

    Purpose: The purpose of this study was to evaluate the effect of the mastication for meal on the flow rate and property of secreted saliva.

    Materials and Methods: Forty-six subjects participated this research with informed consent. Stimulated and unstimulated saliva were collected 30 minutes before a meal. Unstimulated saliva was also collected 0, 10, 20, 30, and 60 minutes after a meal. Amount of the collected saliva was measured and flow rate was calculated. The pH and buffering capacity of saliva were evaluated using a commercially available kit.

    Results: Salivary flow rate, pH and buffering capacity of stimulated saliva were higher than those of unstimulated saliva collected 30 minutes before a meal. The flow rate, pH and buffering capacity of the unstimulated saliva collected just after meal (0 minute) were statistically higher than those 30 minutes before and 20, 30, and 60 minutes after a meal.

    Conclusion: It was concluded that the stimulation induced by the intake of a meal affected flow rate, pH and buffering capacity of unstimulated saliva up to 10 minutes.

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Case Report
  • Hiroyasu Koizumi, Mariko Nishimaki, Kiyoshi Nagano, Hideo Matsumura
    2012 Volume 12 Issue 1 Pages 7-10
    Published: 2012
    Released on J-STAGE: October 06, 2024
    JOURNAL FREE ACCESS

    This case report describes application of a metal bonding system in fabrication of a composite resin veneered fixed partial denture (FPD) with reduced retentive structure. A four-unit framework was fabricated with a silver-palladium-copper-gold alloy (Castwell M.C.12). The surface to be veneered was air-abraded with alumina, followed by priming with a metal adhesive agent (V-Primer). The framework was then veneered with a light-polymerized composite material (Cesead). The completed FPD was seated with a glass ionomer luting agent (HY-Bond Glass Ionomer). After an observation period of five years and two months, the FPD was functioning satisfactorily. The technique described here is applicable in fabrication of composite veneered restorations for vital abutment teeth.

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  • Hiroaki Yamaguchi, Naho Hamano, Yuki Katsumata, Satoshi Ino
    2012 Volume 12 Issue 1 Pages 11-16
    Published: 2012
    Released on J-STAGE: October 06, 2024
    JOURNAL FREE ACCESS

    Purpose: The purpose of the present study was to investigate the manufacturing characterization of zirconia copings for abutments. Comparative evaluation was made using five different CAD/CAM systems.

    Materials and Methods: The abutment model was fabricated. Five zirconia copings were produced using Procera, Katana, Cercon, and Lava 0.5 and 0.6 by CAD/CAM system dealers. Silicone impression material was placed between the abutment model and a coping to observe the manufacturing characteristics and pressed. The abutment model with impression material was embedded in epoxy resin. The embedded model was cut buccolingually using an automatic precision cutter, and the thickness of silicone impression material was observed using an optical microscope with a scale.

    Results: A significant difference was observed in the gap average between Procera and Lava 0.5 (p<0.01), and Procera and Lava 0.6 (p<0.05) in the buccal margin. For the buccal corner and occlusal chamfer, the gap was significantly larger in Procera compared with the other copings (p<0.01). In the palatal margin, the gap was significantly smaller in Lava 0.6 compared with Procera, Katana, and Cercon (p<0.01).

    Conclusion: Marginal lines were smooth and coincided with abutments for all CAD/CAM systems. Although the gap size varied among the manufacturers, the thickness of impression material was smaller, and the processing quality was even in Lava compared with the other copings. These characteristics are considered to be related to the shape and size of drilling tools of each CAD/CAM system.

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Case Report
  • Masako Nakano, Ayuko Takao, Toshiko Ozawa, Tomokazu Igarashi, Nobuko M ...
    2012 Volume 12 Issue 1 Pages 21-26
    Published: 2012
    Released on J-STAGE: October 06, 2024
    JOURNAL FREE ACCESS

    Purpose: The aim of this study was to estimate the utility of an ozone gas generating apparatus (HealOzone) for endodontic treatment by its bactericidal efficiency in vitro.

    Materials and Methods: Water- or TS broth-suspended microorganisms (Streptococcus mutans, Lactobacillus casei, Enterococcus faecalis, and Candida albicans) were exposed to ozone gas for up to 80 s. Serially diluted irrigation agents (H2O2, NaOCl) and E. faecalis were incubated at room temperature for a minute with or without ozone exposure (20 s). In both experiments, survived microbes were determined by semi-quantitative cultivation.

    Results: Eighty second-exposure of ozone gas completely killed the microorganisms suspended in water. However, this treatment had no effect on the same microorganisms suspended in the culture broth, which contained the organic compounds. Combination of ozone gas exposure and H2O2 solution showed synergic effect to kill E. faecalis in water, but not in the broth. In contrast, ozone inhibited the bactericidal effect of diluted NaOCl solution against E. faecalis in water.

    Conclusion: Based on the experimental results, probability of sterilization effect of ozone gas either used with or without root canal irrigation agents was doubtful.

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