初期のデンチャープラーク形成に関する研究
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概要
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For the purpose of studying contamination of prosthetic restoration, daily changes in the amounts of protein adhering to the denture basal surface and of immunoglobulins (IgA, IgG) in the saliva, factors of the formation of initial denture plaque, were measured and their correlation with adhesion and deposition of microorganisms was investigated and the formation of initial denture plaque was examined. The basal surface of the upper full denture and the adjacent surfaces of the abutment tooth of the partial denture were selected as the sites for study. The results were as follows : 1. The amount of protein adhering to the basal surface of the upper full denture showed an increasing tendency with time. By site, the anterior and posterior regions of the basal surface tended to show greater amounts of protein adhesion than the central region. 2. The amount of protein adhering to the adjacent surfaces of the abutment tooth of the partial denture increased abruptly on the first and the second day after insertion of the denture and tended to decrease slightly on the third day. The amount of adhesion was higher than that to the basal surface of the upper full denture. 3. On the basal surface of the upper full denture, microorganisms began to adhere to the basal surface on the second day after insertion of the denture and division and proliferation were observed on the third day. A greater number of microorganisms were found in the anterior and posterior regions of the basal surface than in the central region. 4. On the adjacent surfaces of the abutment tooth of the partial denture, microorganisms began to adhere to the surfaces on the second day after insertion, but no division or proliferation was seen on the third day. 5. The amount of immunoglobulin IgA in the resting saliva was about the same for the subjects with the full or the partial denture. The subjects with natural dentition showed lower values in IgA. The amount of immunoglobulin IgG was higher for the subjects with the partial denture than for those with the full denture. The IgG values for those with natural dentition was about the same as that for the subjects with the full denture. 6. The amounts of immunoglobulins in the resting saliva in the subjects with a denture varied by sex and age. In the subjects with the partial denture, those with more teeth remaining tended to show greater amounts of immunoglobulins (IgA, IgG) in the resting saliva. 7. Between the changes in the amount of immunoglobulins in the resting saliva and the amount of protein adhering to the denture surface, correlation was found in the subjects with the partial denture but not in the subjects with the full denture. 8. The teeth remaining in the subjects with the partial denture tended to show greater amounts of gingival crevicular fluid and of IgA, IgG, and Type I collagen in the gingival crevicular fluid than the teeth with healthy periodontal tissue. This tendency was more marked for the abutment tooth in comparison with the teeth at the same site. On the basis of the foregoing findings, it was suggested that the oral environment of a denture after its insertion and the environment of the site of plaque adhesion greatly affected plaque formation. Also, although plaque formation varied to some extent, the basis for plaque was confirmed to be formed on the third day after insertion of the denture.
- 1987-12-25