2023 Fiscal Year Final Research Report
Can night-denture protect partially edentulous dental arch from sleep bruxism?
| Project/Area Number |
20K10030
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 57050:Prosthodontics-related
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
Inukai Shusuke 東京医科歯科大学, 歯学部, 非常勤講師 (90436650)
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| Co-Investigator(Kenkyū-buntansha) |
和田 淳一郎 東京医科歯科大学, 大学院医歯学総合研究科, 講師 (20611536)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | ナイトデンチャー / 動揺歯 / 残存歯保護 / デジタルデンティストリー |
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| Outline of Final Research Achievements |
We’ve revealed that night dentures would reduce the mobility of remaining teeth with tooth mobility with a randomized controlled trial. As a result, it was indicated that night dentures could protect mobile teeth from sleep bruxism. In addition, we’ve evaluated the effect of post-curing after additive-manufacturing (3D printing) to fabricate night dentures and revealed that post-curing in nitrogen atmosphere would improve the mechanical properties of the materials for digital-fabricated night dentures. Furthermore, we’ve revealed that the digital impressions using intraoral scanners for night denture fabrication were not accurate enough to obtain the remaining teeth facing mucosal areas and those at the posterior region as well as the morphology of the residual ridge.
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| Free Research Field |
歯科補綴学
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| Academic Significance and Societal Importance of the Research Achievements |
本課題では，睡眠時ブラキシズムを有する部分欠損歯列者において，ナイトデンチャー非装着では６ヶ月で残存歯の動揺度が増大するのに対し，ナイトデンチャー装着で動揺度が減少することが示された．動揺度は歯の生存率と関連深いアウトカムであり，本課題の結果は，ナイトデンチャー装着が，部分歯列欠損患者の動揺歯の長期維持にとって有効であることを示している．また，デジタル技術を応用したナイトデンチャー製作に際しては，窒素雰囲気下で後処理を行うことで物性の向上を図れることが分かった一方で，口腔内スキャナを用いてナイトデンチャー用の印象採得を行う上では様々な問題が浮き彫りとなり，今後の研究における課題を明らかとした．
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