Journal of Japanese Society of Oral Implantology
Online ISSN : 2187-9117
Print ISSN : 0914-6695
ISSN-L : 0914-6695
Volume 31, Issue 2
Displaying 1-8 of 8 articles from this issue
Reviews
  • Hitoshi TAKAMORI, Shin OGURA, Maiko YAMADA
    Article type: Review
    2018 Volume 31 Issue 2 Pages 121-134
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    Regarding dental implant treatments prior to the appearance of osseointegrated implants, peri-implantitis, etc. frequently occurred and many oral surgeons dealing with implant removal, etc. were against such implant treatments. On the other

    hand, oral surgeons then carried out alveolar ridge plasties to enable retentive and stable dentures to be worn on the atrophic alveolar ridge; however, it was difficult to obtain an alveolar ridge with sufficient height and width to retain and stabilize the dentures, and early relapse often occurred, limiting the effectiveness.

    Although the concept of osseointegrated implantation was initially confusing, because it was supported by many basic researches with evidence, involved instruments and equipment that were inventive and ingenious, involved a treatment technique with a systematic and theoretical basis as well as broad indications, and demonstrated excellent clinical results, it has come to be accepted by oral surgeons.

    Subsequently, with simplification of the technique as well as the development and sales of an implant body that can quickly and effectively achieve osseointegration along with parts that can restore aesthetics, it has been actively incorporated into daily clinical practices.

    Moreover, additional indication methods such as maxillary sinus floor elevation have also been actively used. However, troubles have occurred, resulting in social problems. Recently, guided surgery using CAD/CAM with less surgical invasion has been actively carried out; however, because such advantages can only be realized with sufficient oral surgical knowledge and skill to avoid trouble, oral surgeons have a major role to play in terms of education and instructions in the clinic.

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  • Nobuhiro YODA, Shigeto KOYAMA, Toru OGAWA, Yoshiki MATSUDATE, Ryuji SH ...
    Article type: Review
    2018 Volume 31 Issue 2 Pages 135-143
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    The structure of peri-implant bone is continuously changing because of bone remodeling induced by mechanical stress, which can cause bone resorption and/or bone mineral density reduction. Therefore, for preserving peri-implant tissue in a healthy condition for a long time, it is essential to design an optimized implant treatment plan considered the relationship be tween the force and bone response. To clarify this relationship, it is necessary to know the actual conditions of in-vivo force exerted on implants via the prostheses while in use. In this paper, we outline the influence of the force exerted on implants on peri-implant bone based on a review of the literature. To date, several methods have been used to measure the force on implants in-vivo. Therefore, studies that analyzed bone remodeling activity using actual in-vivo measured force are also sum marized. Finally, a future vision of implant treatment planning based on force optimization is given.

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  • Masako NAGASAWA
    Article type: Review
    2018 Volume 31 Issue 2 Pages 144-152
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    Recently, the contribution of osteoclastogenesis control through immune receptors and the involvement of immune cells in bone metabolism control have been recognized. The presence of stem cells in peripheral blood has also been confirmed. On the other hand, the detailed mechanisms of local osteoclastogenesis and osteoclast homing from remote areas are yet to be elucidated. Clinically, improvements of implant surface topography are contributing to the rapid establishment of osseointegration. However, detailed tissue reactions around the implants at the early stage of osseointegration are still unknown and there are still many challenges to improving clinical outcomes.

    Bone mass is known to represent the balance between bone formation by osteoblasts and the bone resorption activities of osteoclasts. The importance of osteoclast-mediated bone resorption in the process of osseointegration has not been widely considered. In this study, cell culture was used to verify the hypothesis that the function of implant-adherent bone marrow stromal cells (BMSCs) in osteoclastogenesis is influenced by surface topography. Differences in surface topography altered the phenotype of BMSCs and influenced osteoclastogenesis of bone marrow-derived macrophages (BMMs). In conclusion, this study revealed that surface topography-specific alterations in the function of BMSCs influenced cell culture-mediated BMMsderived osteoclastogenesis and demonstrated that surface topography influences local cells in vivo as well. Local signaling by implant-adherent cells at the implant–bone interface may indirectly control osteoclastogenesis and bone accrual around endosseous implants. This research may lead to future clarification of implant related bone biology.

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Original Paper
  • Akira SHIMODE, Tadamori KAJIMOTO, Mitsuyoshi YAMAZOE, Masato HOTTA
    Article type: Original Paper
    2018 Volume 31 Issue 2 Pages 153-161
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    Physical therapy with ultrasound has been attracting attention as a treatment method with a marked effect and causing little stress. Low-intensity pulsed ultrasound (LIPUS), with low stimulus and output, is used to promote wound healing, treat non-union fractures, and encourage tissue regeneration after implant placement.

    The influence of LIPUS on bone differentiation and regeneration was investigated at the cell level in a previous study, but the influence on muscle, which receives mechanical stress similar to bone, has not been investigated. In this study, to investigate the influence of LIPUS on muscle cell differentiation, mouse C2C12 cells, which can differentiate into myotube cells in vitro, were irradiated with LIPUS and the influence was investigated.

    3-MHz LIPUS irradiation showed no cytotoxicity for C2C12 cells even when the output was increased to 90 mW/cm2. Furthermore, 3-MHz LIPUS irradiation for 15 min at 70 mW/cm2 output promoted the differentiation of C2C12 cells (myoblasts) into myotube cells, and the effect of a single application was not different from that of once-a-day application for 7 days.

    It is suggested that LIPUS irradiation has a muscle differentiation-promoting action.

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Case Report
  • Yuji TERAMOTO, Sinobu UEHARA, Yoshichika YASUNAGA, Nobuhiko YOSHIMURA, ...
    Article type: Case Report
    2018 Volume 31 Issue 2 Pages 162-169
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    Once medication-related osteonecrosis of the jaw (MRONJ) develops, patients suffer from pain and severe functional disor der. Furthermore, it is difficult to treat an extensive lesion in MRONJ. In this study, we report a MRONJ patient in whom mandibulectomy, mandibular reconstruction with free fibular flap, and occlusal reconstruction with a dental implant were ef fectively performed.

    The patient was a 73-year-old female. She consulted a private dental clinic with left lower molar pain in March 2011. Under a diagnosis of periodontitis of the left lower first premolar, tooth extraction was performed. She felt pain in the left lower mo lar region, and consulted a private dental clinic. Hemorrhage and pus discharge were observed around the tooth extraction socket. She visited our department for examination and treatment in October 2011. Her medical history was right mastecto my for right breast cancer with lymph node dissection. Chemotherapy with docetaxel hydrate (Taxotere®), zoledronic acid hydrate (Zometa®), and medication with capecitabine (Xeloda®) was performed by intravenous administration. Therefore, under a diagnosis of MRONJ, conservative treatment including oral health care, irrigation of the lesion, and antimicrobial therapy were started from the time of the initial consultation in our department. In addition, hyperbaric oxygen therapy was performed. However, the symptoms worsened and the area of osteonecrosis rapidly expanded.

    Therefore, it was considered difficult to continue conservative therapy and surgery was planned. In July 2012, segmental resection of the mandible and reconstruction with revascularized fibular free flap were performed. There was no recurrence of MRONJ during the postoperative course. In May 2013, dental implants were secondarily planted. Subsequently, vestibular plasty was performed with secondary surgery. In December 2014, a removable denture was set, resulting in high satisfaction of the patient. In the present case, we selected surgery for MRONJ, and suggest the usefulness of occlusal reconstruction with dental implants.

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Survey, Statistics and Materials
  • Futoshi MORINAGA, Takatoshi ITOH, Naruyoshi ABE, Yoshiki SOEJIMA, Naoy ...
    Article type: Survey, Statistics and Materials
    2018 Volume 31 Issue 2 Pages 170-179
    Published: June 30, 2018
    Released on J-STAGE: July 25, 2018
    JOURNAL FREE ACCESS

    Implant survival rate is often used to determine the long-term success of implant treatment. However, it is not enough to understand the real conditions of patients. The purpose of this study was to clarify the long-term conditions of patients treated by dental implants. We sent a questionnaire to patients for whom at least 20 years had passed since their implant treatment. The patients were treated by a dentist of the Kyushu Implant Research Group. The questionnaire was sent to 1,168 patients and 509 patients responded (44%). Seventy-eight percent of patients reported having no trouble with their implant at all, 68% had no trouble with their own teeth, and 84% answered that they could eat well. Ninety-three percent of patients were satisfied with their implant treatment.

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Committee Reports
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