A Qualitative Analysis on Bone Dynamics in the Tissue under Denture Base Lacking in Self-cleaning.

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  • Kadoya Shin-ichi
    Department of Removable Prosthodontics, Okayama University Dental School
  • Sato Takashi
    Department of Removable Prosthodontics, Okayama University Dental School
  • Nakashima Keiichiro
    Department of Removable Prosthodontics, Okayama University Dental School
  • Hara Tetsuya
    Department of Removable Prosthodontics, Okayama University Dental School
  • Shirai Hajime
    Department of Removable Prosthodontics, Okayama University Dental School
  • Mori Shingo
    Department of Removable Prosthodontics, Okayama University Dental School
  • Utama Mohammad Dharma
    Department of Removable Prosthodontics, Okayama University Dental School
  • Abe Toshihiko
    Department of Removable Prosthodontics, Okayama University Dental School

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  • 自浄作用の欠如に伴う義歯床下骨組織の動態に関する定性的観察

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The purpose of the present study was to estimate the qualitative dynamics of bone tissue under denture base caused by lack of self-cleaning as a result of coverage by denture base, utilizing double labeling technique with bone markers and contact microradiography.<BR>The experimental denture base was designed to make contact with molar region of the palate of rat and to transmit no occlusal forceto the tissues under the denture base. The denture base was not removed throughout the experimental period. This procedure caused lack of self-cleaning, and it also caused continuous pressure to be applied to palatal tissues under the denture base by the accumulation of exfoliative horny cells, which induced bone resorption and formation under the denture base.<BR>The results were as follows:<BR>1. Two to three weeks after the insertion of the denture base, number of osteoclasts and Howship's lacunae were observed on the palatal surface of hard palate bone tissue under the denture base. In the same observation period, increased bone formation was observed on the nasal surface.<BR>2. Four to six weeks after the insertion of the denture base, increased bone formation was observed on the palatal surface of hard palate bone tissue under the denture base. Bone formationwas observed mainly in Howship's lacunae, and only slight bone formation was observed in other region. 3. The first one week and from seven to ten weeks after the insertion of the denture base, bone formation was suppressed on the palatal surface of hard palate bone tissue under the denture base.

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