Nihon Shishubyo Gakkai Kaishi (Journal of the Japanese Society of Periodontology)
Online ISSN : 1880-408X
Print ISSN : 0385-0110
ISSN-L : 0385-0110
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Volume 49, Issue 2
Displaying 1-7 of 7 articles from this issue
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A Foreword
Review
Original Work
  • Plaque removal efficacy of a sonic toothbrush
    Takao Suzuki, Satoru Mochizuki, Sachiko Yamamoto, Hajime Miyashita, Ma ...
    Article type: Original Work
    2007 Volume 49 Issue 2 Pages 120-129
    Published: 2007
    Released on J-STAGE: August 09, 2007
    DOIhttps://doi.org/10.2329/perio.49.120
    JOURNAL FREE ACCESS
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    The purpose of this study was to analyze the plaque removal efficacy with a sonic toothbrush. We also investigated the effects of a video teaching material that provided appropriate instructions for plaque removal with a sonic toothbrush. The subjects were 28 volunteers (14 male, 14 female, average age 24.1±1.8 years-old), who were students of Showa University Dental School. First 2 weeks, no significant differences were observed in the plaque removal efficacy between the manual and sonic toothbrush group. However, at 5 months from baseline, significant improvement of plaque control record and plaque removal were noted in the sonic toothbrush group (p<0.05). On the other hand, the improvement of the plaque removal effect was not affected by the use of the video teaching material. These results suggested that the long term training is needed for acquisition of skill for high level plaque removal with the use of a sonic toothbrush. Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 49 : 120-129, 2007.
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  • Effects of CO2 Laser Treatment Combined with Scaling and Root Planing on Periodontal Pockets in Chronic Periodontitis Patients
    Kaku Watanabe, Masashi Murata, Taichi Nagamori, Toshikazu Yamaguchi, H ...
    Article type: Original Work
    2007 Volume 49 Issue 2 Pages 130-138
    Published: 2007
    Released on J-STAGE: August 09, 2007
    DOIhttps://doi.org/10.2329/perio.49.130
    JOURNAL FREE ACCESS
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    Objective: This study compared the effect of CO2 laser + scaling and root planing (SRP) versus SRP alone in the treatment of chronic periodontitis.
    Method: Fifteen healthy patients with moderate periodontitis and 2 or more sites with a probing depth of ≥5 mm were included in the study. A total of 30 sites were treated with a combination of CO2 laser and SRP (test, n=15) or SRP alone (control, n=15). The plaque index (PlI), gingival index (GI), probing pocket depth (PPD), clinical attachment level (CAL) and bleeding on probing (BOP) were examined. At the baseline and at 2, 4 and 12 weeks after the start of treatment, subgingival plaque and gingival crevicular fluid (GCF) were also sampled for analysis of the amounts of Porphyromonas gingivalis (P.gingivalis) and interleukin-1β (IL-1β).
    Results: A significant decrease in the GI, BOP and PPD scores, GCF volume and the amounts of P. gingivalis was found in both the test and control groups after treatment. However, there were no significant differences in any the investigated parameters between the two groups, including the amounts of P. gingivalis and IL-1β.
    Conclusion: The present data suggest that treatment of chronic periodontitis with either CO2 laser + SRP or SRP alone results in statistically significant improvements in the clinical parameters and subgingival flora. However, the combination of CO2 laser irradiation to the marginal gingiva + SRP did not appear to provide any additional treatment benefits as compared to SRP alone. Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 49 : 130-138,2007.
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  • Growth factors in Human cementum and dentin
    Ayako Kakegawa
    Article type: Original Work
    2007 Volume 49 Issue 2 Pages 139-150
    Published: 2007
    Released on J-STAGE: August 09, 2007
    DOIhttps://doi.org/10.2329/perio.49.139
    JOURNAL FREE ACCESS
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    It is well known that preservation of the cementum on the root surface is advantageous for periodontal regeneration.
    This effect may be attributable to the presence of growth factors in the cementum. In this study, we determined the presence and measured the levels of BMP-2 and TGF-β1 in the cementum and compared them with those in dentin. The root of the human third molars was cut into 0.5mm thick slices, and the slices were demineralized with 0.1M HCl solution. The cementum and dentin were separated using a sharp blade under a microscope. Then, the samples were extracted with 4M guanidine solution. The alkaline phosphatase (ALP) activity of the extracts was detected using human periodontal ligament (HPDL) cells and C2C12 cells and compared between the cementum and dentin.
    TGF-β1 and BMP-2 were detected by the luciferase reporter gene assay. We observed reciprocal inhibiory activity between BMP-2 and TGF-β1, therefore, the ALP activity of each of the growth factos was measured using Noggin (a BMP-2 inhibitor) and SB431542 (a TGF-β1 inhibitor). We calculated the amount of active type TGF-β1 and BMP-2 in each extract based on the ALP activity of recombinant TGF-β1 and BMP-2. The results revealed the presence of TGF-β1 at 35.8pg of BMP-2 at 193pg and a BMP-2/ TGF-β1 ratio of 5.39 in the cementum and the presence of TGF-β1 at 58.6pg, of BMP-2 at 241pg and a BMP-2/TGF-β1 ratio of 4.11 in dentin. These results suggest the possibility that cementum, which has a higher as amount of BMP-2, induces osteoblast cells to a greater degree as compared to dentin. Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 49 : 139-150,2007.
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Case Report
  • A Case Report of Comprehensive Treatment by the Periodontal Regeneration
    Technique for Aggressive Periodontitis.
    Kohzoh Kubota, Makoto Yokota
    Article type: Case Report
    2007 Volume 49 Issue 2 Pages 151-161
    Published: 2007
    Released on J-STAGE: August 09, 2007
    DOIhttps://doi.org/10.2329/perio.49.151
    JOURNAL FREE ACCESS
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    Generalized aggressive periodontitis is a rarely encountered condition characterized by rapid periodontal destruction in otherwise healthy subjects In this paper, inclusive comprehensive treatment including periodontal surgery, induction of periodontal regeneration,tooth transplantation and orthodontic treatment in a patient diagnosed to have generalized aggressive periodontitis is reported. A 21-year-old female with the chief complaint of mobility of the lower anterior teeth and swelling of the gingiva was diagnosed as having severe attachment loss and bone resorption by the clinical and radiographic examinations.
    The family medical history of the patient revealed that the paternal uncle had started using complete dentures in his prime and that a cousin of similar age also had similar symptoms.
    After the initial therapy, periodontal surgery was performed for the molars, with the maxillary right first molar extracted and the third molar of the same side transplanted at the same time. Enamel matrix derivatives (EMD) was also applied on the maxillary and mandibular left molars. The maxillary teeth were corrected by orthodontic treatment and fixed by prosthetic restoration. The result showed a well-improved periodontal tissue. The 4-year follow revealed successful progress. Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 49 : 151-161,2007.
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Research,Report
  • A survey of periodontal basic training for dental students
    Joichiro Suzuki, Keisuke Nakashima, Kazushi Kunimatsu, Shogo Takashiba ...
    Article type: Research Report
    2007 Volume 49 Issue 2 Pages 162-174
    Published: 2007
    Released on J-STAGE: August 09, 2007
    DOIhttps://doi.org/10.2329/perio.49.162
    JOURNAL FREE ACCESS
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    In clinical dentistry, dental students have to master not only their knowledge of dentistry, but also their dental skills and communication skills with patients. The purpose of this study was to collect basic data on periodontal basic training at Japanese dental colleges and dental faculties at universities for considering an OSCE. A questionnaire regarding the contents and status of the training was sent to 29 Japanese Society of Periodontology directors in charge of periodontology training at dental colleges and dental faculties at universities. Twenty-six of the questionnaires were returned and the data were analyzed statistically.
    In regard to the time of start of periodontal training, most dental colleges and dental faculties at universities start the training from the fourth grade and less freguently from the fifth grade. The number of training classes varied widely from two to 23. Practice hours were distributed from 90 to 360 minutes, with an average of 34.5 hours. The contents of the training at most dental colleges and dental faculties at universities included examination of the periodontal condition and physical diagnosis, X-ray diagnosis, brushing instructions, scaling, periodontal surgery, occlusal adjustment and temporary fixation. The most important subjects for an OSCE are brushing instructions, followed by scaling and root planing.
    Explanation of the disease condition and brushing instructions to periodontal patients have recently been emphasized as important subjects. The subject of periodontology in OSCE is considered to be very important and shows the future direction of periodontal education. Nihon Shishubyo Gakkai Kaishi (J Jpn Periodontol) 49 : 162-174,2007.
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