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2021 Fiscal Year Final Research Report

Analysis of microbiome organized on denture base of older adults

Research Project

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Project/Area Number 19K10216
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57050:Prosthodontics-related
Research InstitutionTokyo Dental College

Principal Investigator

RYU MASAHIRO  東京歯科大学, 歯学部, 准教授 (20549985)

Co-Investigator(Kenkyū-buntansha) 石原 和幸  東京歯科大学, 歯学部, 教授 (00212910)
上田 貴之  東京歯科大学, 歯学部, 教授 (20366173)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywordsデンチャープラーク / 口腔微生物 / 義歯 / 高齢者
Outline of Final Research Achievements

By the analysis at genus level of a principal coordinate analysis plot, there were no difference of microbiome on the materials of acrylic resin or cobalt-chromium alloy, which are denture base materials and hydroxyapatite, which is supposed to be natural teeth was found . In particular, Streptococcus and Neisseria spp. were the majority. These bacteria are common in the early stages of dental plaque formation. It is suggested that denture plaque having a composition similar to that of dental plaque was formed on the materials.
On the other hand, there were differences in the microbiome between that in saliva and on three kinds of materials. Saliva contains floating bacteria. On the other hand, the microbes on the teeth and denture base have a high proportion of bacteria that adhere to the material, so it is considered that the microbial flora was different.

Free Research Field

医歯薬学

Academic Significance and Societal Importance of the Research Achievements

これまでの義歯に付着した微生物を検索する研究は、主に特定の微生物もしくは微生物の総数を検討することによって行われており、どのような組成のバイオフィルムが義歯表面に形成されているかについては十分明らかでなかった。今回、16s rRNAシークエンサーを用いて義歯床用材料に形成されたマイクロバイオームを詳細に解析したことで、義歯に付着した微生物叢が唾液の微生物叢と異なり、デンチャープラークと類似していることが明らかとなった。この結果により、義歯清掃のアプローチ法について、デンタルプラークへのアプローチを参考に詳細に検討することが可能になると考えられ、学術的意義の高い研究であったと考えられる。

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Published: 2023-01-30  

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