Food intake motion affects tooth erupting timing.

• Project/Area Number: 19K10379
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 57070:Developmental dentistry-related
• Research Institution: Niigata University
• Principal Investigator: HAYASAKI HARUAKI 新潟大学, 医歯学系, 教授 (60238095)
• Co-Investigator(Kenkyū-buntansha): 中村 由紀 新潟大学, 医歯学系, 准教授 (70452779)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 小児 / 摂食 / 歯の萌出 / 咀嚼 / 口腔機能 / 発達 / 捕食機能 / 乳歯 / 永久歯

Outline of Research at the Start

本研究は，１．離乳食の早期開始は乳前歯の萌出時期を早めるか？　２．普通食の早期開始は乳臼歯の萌出時期を早めるか？　３．乳歯列期に咀嚼回数が多いと永久歯への交換は早まるか？　上記の３つの問いを検証することにより，研究課題名「小児の摂食行動は歯の萌出時期に影響を与える」の解を導くことを目的とする．加えて，これらの問いの検証は，１）乳幼児の哺乳から普通食に至る摂食行動（質，量，時間等）の評価，２）小児の咀嚼回数により摂食行動を評価，であることから，これらの調査，評価方法の確立とその結果を得ることも目的となる．

Outline of Final Research Achievements

The background of this study is that the eruption time of primary teeth in Japan tends to be "earlier for anterior and later for molars", and this tendency is observed in developed countries such as the United States, but not in developing countries. It can be understood that tooth eruption timing is related to feeding behavior.
Continuous measurement in children could not be performed because of the spread of coronavirus infection, especially for children. We intend to continue measurements in children as soon as the epidemic is under control, thereby achieving the objective of this research project. In this study, we investigated the lip function, which is closely related to the tooth eruption of children, and found that the lip function of children during feeding was different from that of adults.

Academic Significance and Societal Importance of the Research Achievements

本研究は，小児の摂食行動と歯の萌出時期との関係を明らかにすることを目的とし，近年保険収載された「口腔機能発達不全症」との関連性を視野に入れつつ小児の摂食行動の経時的変化を明らかにすることをねらった．これらが明らかになったあかつきには，日本の現代の食の問題と口腔機能の関連に深長な所見が得られる．
コロナの蔓延に伴い，本研究の本来の目的は未達であるが，今後継続的に取り組み，早々に結果を出す所存である．

Research Products

• [Journal Article] Lip‐closing pressure during food intake from a spoon in normal children (2021)
  • Author(s): Sasakawa Y, Nakamura Y, Saitoh I, Nakajima T, Tsukuno S, Hozawa M, Sotome T, Nogami Y, Kurosawa M, Iwase Y, Hayashi T, Hayasaki H
  • Journal Title: Journal of Oral Rehabilitation Volume: 48 Issue: 6 Pages: 0-9
  • DOI: 10.1111/joor.13155
  • Peer Reviewed / Open Access
• [Journal Article] Oral Function and Feeding Management in a Child with Alpha Thalassemia X-Linked Intellectual Disability Syndrome (2021)
  • Author(s): Nakamura Y, Hanasaki M, Sano T et al.
  • Journal Title: J Dent Child Volume: 88 Pages: 206-209
  • Peer Reviewed
• [Journal Article] Prevalence of an incompetent lip seal during growth periods throughout Japan (2021)
  • Author(s): Nogami Y, Saitoh I, Inada E, Murakami D, Iwase Y, Kubota N, Nakamura Y, Kimi M, Hayasaki H, Yamasaki Y, Kaihara Y
  • Journal Title: Environ Health Prev Med Volume: 26 Issue: 1 Pages: 0-10
  • DOI: 10.1186/s12199-021-00933-5
  • Peer Reviewed / Open Access
• [Presentation] 小児のスプーンを用いた捕食時口唇圧に食品の差異が及ぼす影響 (2020)
  • Author(s): 笹川祐輝，中村由紀，中島 努，築野沙絵子，朴沢美生，五月女哲也，岩瀬陽子，齋藤一誠，早崎治明
  • Organizer: 第58回日本小児歯科学会大会
• [Presentation] スプーンを用いた捕食運動における小児期の特徴 (2020)
  • Author(s): 笹川祐輝，中村由紀，中島 努，築野沙絵子，朴沢美生，五月女哲也，岩瀬陽子，齊藤一誠，早﨑治明
  • Organizer: 令和2年度新潟歯学会第1回例会