The Bulletin of Tokyo Dental College
Print ISSN : 0040-8891
Volume 45, Issue 4
November
Displaying 1-4 of 4 articles from this issue
Original Articles
  • MASANORI NASHIMOTO, KENICHI MATSUZAKA, MASAO YOSHINARI, MASAKI SHIMONO ...
    Article type: Others
    Subject area: Others
    2004 Volume 45 Issue 4 Pages 201-211
    Published: 2004
    Released on J-STAGE: July 15, 2005
    JOURNAL FREE ACCESS
    The purpose of this study was to investigate the behavior of rat bone marrow cells (RBM) growing on surfaces with different pore sizes. RBM behavior on Millipore filters (MF-MilliporeTM membrane filter) made from cellulose mixed esters with 5 different pore surfaces (0.45μm, 1.2μm, 3.0μm, 5.0μm and 8.0μm) were compared in terms of morphological changes on the different pore sizes. Furthermore, the expressions of osteopontin and osteocalcin mRNAs were investigated. On the 1.2μm and 3.0μm pore surfaces, RBM attached to the substrate well, but cells on the 5.0μm and 8.0μm pore surfaces invaded deeply into the pores. Higher levels of both osteopontin and osteocalcin mRNA expression were always observed in cells cultured on the 1.2μm filter. These results suggest that the 1.2μm Millipore filter pore size is the most suitable for inducing RBM to differentiate into an osteoblastic phenotype among these surfaces and is probably related to production of the ECM but not to the phenomenon of cell spreading.
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  • LI ZHIYONG, TOMOHIKO ARATAKI, ICHIRO SHIMAMURA, MASATAKA KISHI
    Article type: Others
    Subject area: Others
    2004 Volume 45 Issue 4 Pages 213-221
    Published: 2004
    Released on J-STAGE: July 15, 2005
    JOURNAL FREE ACCESS
    The aim of this study was to observe the influence of prosthesis design and loading condition on the stress distributions of tooth-implant supported prostheses. Six 2D finite element models, two reference models, and four experimental models were computed to simulate different prosthesis designs. Six different loading conditions were applied to investigate the stress distributions of tooth and implant, respectively. The stresses of reference models were considered as 100%; the stresses of experimental models at the same locations were compared with those of reference models. The stresses around implants were higher than those around teeth. When vertical loading was applied only on the implant, the stresses to both the implant and teeth were at their lowest. The highest stress to the tooth was in the model TTPF and the lowest in the model TPFF. The highest stress to the implant was in the model TPPF and the lowest in the model TPFF. These data indicated that the loading on the tooth-implant supported prosthesis was mainly supported by the implant. Minimizing the loading on the tooth decreased the stress to both the tooth and the implant. Adding fixtures as abutment was more effective in decreasing the stress than adding tooth as abutment in tooth-implant supported prosthesis.
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Case Reports
  • DAISUKE SATO, KENICHI MATSUZAKA, MITSURU YAMA, TAKASHI KAKIZAWA, TAKAS ...
    Article type: Others
    Subject area: Others
    2004 Volume 45 Issue 4 Pages 223-227
    Published: 2004
    Released on J-STAGE: July 15, 2005
    JOURNAL FREE ACCESS
    This case report describes a rare case of an adenomatoid odontogenic tumor (AOT) arising in the mandibular third molar region of a 20-year-old female. The tumor was a well-circumscribed intraosseous lesion with an embedded tooth. Histologically, the induction of extensive globular calcification was evident in addition to the characteristic histological features of AOT. The present case lends support to the categorization of AOT as an odontogenic tumor consisting of a disorderly mixture of odontogenic epithelium and odontogenic ectomesenchyme with calcification.
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  • KENICHI MATSUZAKA, SATOSHI MURAKAMI, MASAKI SHIMONO, TAKASHI INOUE
    Article type: Others
    Subject area: Others
    2004 Volume 45 Issue 4 Pages 229-233
    Published: 2004
    Released on J-STAGE: July 15, 2005
    JOURNAL FREE ACCESS
    This case report describes a rare case of canalicular adenoma arising in the upper lip of a 61-year-old male patient. Macroscopic examination of the tumor revealed a well-defined, smooth, firm, elastic hard, round nodule with a diameter of 1.0cm. The cut surface was white. Histopathology showed that the tumor was an encapsulated mass with a complex cellular pattern of anastomosing duct-like or trabecular structures lined by a single layer of tall columnar epithelial cells, which were embedded in a loose, fibrous, and highly vascular connective tissue stroma. The tumor cells were immunoreactive to AE1/AE3, CK19 and S-100, were partially positive for CK7, CK8, GFAP and PCNA, but were negative for SMA, CK13, CK14 and vimentin.
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