How does mind and body development affect tooth brushing?

• Project/Area Number: 25862025
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Orthodontics/Pediatric dentistry
• Research Institution: Kagoshima University
• Principal Investigator: Ito Chiaki 鹿児島大学, 医歯(薬)学総合研究科, 客員研究員 (40452940)
• Research Collaborator: INADA Emi 鹿児島大学, 医歯学域医学部・歯学部附属病院, 助教 (30448568) ; SAITOH Issei 新潟大学, 医歯学総合研究科, 准教授 (90404540) ; Yu Yong 鹿児島大学, 理工学域 工学系, 准教授 (20284903)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2014: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 歯磨き動作 / モーションキャプチャ / 定量解析

Outline of Final Research Achievements

The arm motion while brushing teeth was quantitatively evaluated and compared between adults and children. At first, we evaluated the tooth-brushing motion of adults. The toothbrush motion performed by a dental hygienist was captured using a motion-capturing system. The dental hygienist brushed the right and left upper molars. The frequency and power spectrum of the toothbrush motion and the joint angles of the shoulder, elbow, and wrist were assessed and statistically analyzed.
The dental hygienist had an individual distinctive rhythm during tooth brushing. The elbow generates an individual’s frequency via a stabilizing movement while moving from the right to the left side. The arm joints moved in synchrony during brushing of both, the upper right and left molars. The tooth-brushing motion was controlled by coordinated movements of the arm joints. The results suggest that the shoulder and wrist regulate brushing on the right side, while the wrist regulates it on the left side.

Research Products

• [Journal Article] 高精度モーションキャプチャシステムを用いた刷掃動作の解析 ― 第４報：利き手と非利き手の刷掃動作の比較と解析― (2015)
  • Author(s): 余 永，兒玉瑞希，稲田絵美，齊藤一誠，冨山大輔，武元嘉彦，村上大輔，森園 健，下田平貴子，福重雅美，北上真由美，山崎要一
  • Journal Title: 小児歯科学雑誌 Volume: ５３ Pages: 383-389
  • NAID: 130005277395
  • Peer Reviewed / Open Access
• [Journal Article] Quantitative Evaluation of Toothbrush and Arm-joint Motion during Tooth Brushing (2014)
  • Author(s): Emi Inada, Issei Saitoh, Yong Yu, Daisuke Tomiyama, Daisuke Murakami, Yoshihiko Takemoto, Ken Morizono, Tomonori Iwasaki, Yoko Iwase, Youichi Yamasaki
  • Journal Title: Clinical Oral Investigations, Springer Volume: Published Online Issue: 6 Pages: 1-12
  • DOI: 10.1007/s00784-014-1367-2
  • Peer Reviewed / Open Access