The Bulletin of Tokyo Dental College
Print ISSN : 0040-8891
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Original Articles
  • Koichi Yoshino, Koji Ito, Masahiko Kuroda, Naoki Sugihara
    2021 Volume 62 Issue 4 Pages 205-214
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    The purpose of this study was to investigate the survival of removable partial dentures with a mandibular bilateral free end saddle (BFES) and abutment teeth in a clinical setting. Only mandibular dentures with a BFES were included (10 or fewer present teeth, and fewer than 4 occlusal units). The endpoints were replacement of denture and loss of abutment teeth. A total of 128 dentures and 595 abutment teeth were analyzed. Nineteen dentures had to be replaced during the observation period (mean duration: 11.4±6.9 years; range: 3 to 36 years). According to Kaplan-Meier analysis, the survival rate was 93.2% at 10 years and 68.6% at 20 years. The estimated mean survival period was 27.8 years. Single-factor analysis using the log-rank test showed that no factor investigated had a significant influence. The main reason for denture replacement was loss of abutment teeth (47.4%). The survival rate of the abutment teeth was 91.3% at 10 years and 77.3% at 20 years. The analysis revealed 4 significant risk factors: male sex (hazard ratio [HR]: 1.78); premolars (HR: 1.67); a lower number of abutment teeth (HR: 3.24); and history of endodontic treatment (HR: 2.79). The removable partial dentures with a mandibular BFES in this study lasted over 20 years, and their survival was influenced by loss of abutment teeth. Dentures are used continuously over long periods of time and should therefore be designed to allow easy adjustment when abutment teeth are lost.

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  • Naoyuki Yoshino, Yasushi Nishii, Takashi Kamio, Takashi Takaki, Takahi ...
    2021 Volume 62 Issue 4 Pages 215-226
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    Repositioning of the jaw in orthognathic treatment generates changes in the soft tissues of the maxillofacial region, with consequent changes in the airway. The purpose of this study was to determine how type of orthognathic surgical procedure affected the 3-dimensional morphology of the upper airway. Forty patients were divided into the following 2 groups according to the type of surgical procedure used: a horseshoe osteotomy (HS) group (20 patients, comprising 11 men and 9 women; average age 24.3±4.5 years) who underwent bimaxillary surgery; and a LeFort I osteotomy (LF) group (20 patients, comprising 8 men and 12 women; average age 22.5±4.6 years) who also underwent bimaxillary surgery. Cephalometric measurements were taken and 3-dimensional pharyngeal morphology evaluated in each group. The amounts of maxilla rotation, posterior maxilla impaction, and mandibular setback all revealed a significantly larger value in the HS group. Evaluation of pharyngeal volume revealed a significant decrease in the upper pharyngeal segment in the LF group. A significant decrease in the lower pharyngeal segment was observed in both groups. Differences were noted in postoperative pharyngeal morphology between the two groups. The results of this study suggest that HS has less effect on the upper pharyngeal segment, regardless of the amount of posterior maxilla impaction.

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  • Kyotaro Koshika, Keikoku Tachibana, Tatsuki Hoshino, Reiko Terashima, ...
    2021 Volume 62 Issue 4 Pages 227-234
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    A minitracheostomy (MTS) is performed after surgery for oral cancer at our institution in patients who are at risk of postoperative airway obstruction. The aim of this study was to evaluate outcomes of preventive airway management with this procedure. A total of 105 patients undergoing preventive airway management with a Seldinger MTS kit after oral cancer surgery between October 2014 and March 2020 were enrolled. Information on patient characteristics, time required for the MTS, duration of tracheal cannula placement, and MTS-related complications was obtained from both the medical and anesthesia records. In addition, the numbers of postoperative instances of tracheotomy between April 2009 and September 2014 and extubation between October 2014 and March 2020 were also counted for a comparison. The time required for an MTS was 3.2±2.6 min. Minor complications, including mild subcutaneous or mediastinal emphysema and bleeding, were found in 5 patients, but all recovered in a short time. The median duration of tracheal cannula placement was 2 days, with a range of from 0 to 8 days. A total of 348 oral cancer surgeries were performed between April 2009 and September 2014. Among patients undergoing these procedures, 111 underwent a tracheostomy (32%), 235 extubation (68%), and 2 sustained intubation. A total of 580 oral cancer surgeries were performed between October 2014 and March 2020. Here, 121 patients underwent a tracheostomy (21%), 105 an MTS (18%), and 354 extubation (61%). The results suggest that an MTS can be performed safely and smoothly with no significant complications. They also suggest that an MTS reduces the need for a full tracheostomy and the risk of airway obstruction after extubation. We conclude that airway management strategy with an MTS is a useful option in preventing airway obstruction following oral cancer surgery.

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  • Seitaro Suzuki, Naoki Sugihara, Hideyuki Kamijo, Manabu Morita, Takayu ...
    2021 Volume 62 Issue 4 Pages 235-243
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    This report describes a validation study of data in the National Database of Health Insurance Claims and Specific Health Checkups of Japan (NDB) obtained by nationwide surveys on tooth extractions. The following 3 data sources on tooth extractions in Japan were compared: (1) the Nationwide Survey of the Reasons for Permanent Tooth Extractions in Japan (a previous survey conducted by the present authors); (2) the Statistics on Medical Care Activities in Public Health Insurance; and (3) the 4th NDB Open Data Japan. Source 1 was a nationwide survey conducted in 2018; sources 2 and 3 comprised data that are freely available for use by the public. In Source 1, 2,345 of 5,250 dentists approached responded to the questionnaire (recovery rate: 44.8%). The number of extracted teeth among younger age groups (aged 25–50 years) reported in Source 1 was lower than that in the other two sources. In contrast, the number of extracted teeth among older age groups reported in Source 1 was higher than that reported in the other two sources. However, when stratified by age group, all differences across the 3 sources regarding the mean annual number of tooth extractions were <0.05 teeth/year. The present results suggest that the NDB is a reliable resource for data on tooth extractions performed across the entire Japanese population.

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Case Reports
  • Hideki Ichikawa, Miki Watanabe, Syuntaro Nomoto, Junko Yagisawa, Aki I ...
    2021 Volume 62 Issue 4 Pages 245-251
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    Here we describe a rare case of mandibular cancer involving almost the entire attached gingiva in a 71-year-old man. First, marginal resection of the entire mandible was performed, followed by one-stage reconstruction comprising application of a split-thickness skin graft onto the wound. This resulted in good alveolar ridge morphology, allowing for a mandibular prosthesis to be installed soon postoperatively. Histopathological analysis revealed a well-differentiated squamous cell carcinoma extending throughout most of the resected attached gingiva, but no malignant features in the stumps. Furthermore, no infiltration into the jawbone was observed, and no vascular or lymphatic invasion or perineural infiltration. At 3 years postoperatively, the patient’s clinical course has remained uneventful, with no recurrence or problems arising in the remaining mandible. The patient is also able to eat regularly using the mandibular prosthesis provided.

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  • Sho Usuda, Wataru Muraoka, Seiji Asoda, Nobuyuki Horie, Taneaki Nakaga ...
    2021 Volume 62 Issue 4 Pages 253-260
    Published: 2021
    Released: December 04, 2021
    [Advance publication] Released: November 15, 2021
    JOURNAL FREE ACCESS

    When pain adversely affects a patient’s activities its diagnosis needs to be fast and accurate to allow effective treatment to be commenced as soon as possible. Difficulties may be found in achieving this, however, in elderly patients with age-associated cognitive decline, as they may not be capable of properly understanding or recalling their symptoms. The present case concerns a 77-year-old woman who presented with the chief complaint of pain in the right mandible persisting throughout the day, and severe enough to necessitate her lying down in bed all day long. The use of open-ended questions followed by a structured interview focused on pain with closed-ended questions revealed that she experienced paroxysms of pain throughout the day and that she was afraid of its occurrence. Based on these findings, the diagnosis was trigeminal neuralgia. Carbamazepine decreased the pain with no side effects. The patient continued taking carbamazepine for 3 months, during which time she was closely monitored for adverse reactions. No side effects, such as drowsiness or dizziness, were observed, however, and the pain subsided completely with no recurrence, even after cessation of carbamazepine.

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