The evaluation of mechanical property of enamel using an indentation microfracture method and quantitative analysis

• Project/Area Number: 20791571
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Orthodontic/Pediatric dentistry
• Research Institution: Niigata University
• Principal Investigator: SAKAI Sachiko Niigata University, 医歯学系, 助教 (70397131)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2009: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2008: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 歯学 / 物性実験 / バイオメカニクス / 破壊力学

Research Abstract

The fracture toughness was shown to be dependent upon the structural qualities of enamel specimens. The fracture toughness value (K_<IC>) in the indentation area from 40 to 70% toward the cusp was a significant larger than the area from 70 to 100%. The clear clack configuration was restrictive accepted as data of results in the indentation area from 0 to 40% because there was small number of clear clack conf igurat ion. It was recognized that the Vickers microhardness numbers do not depend upon the the magnitude of the applied load. The results of quantitative analysis us ing peripheral quantitative computed tomography also were supported for the obtained mechanical f indings

Research Products

• [Journal Article] The early treatment of unusual sever ectopic eruption of the bilateral maxillary canines in a young Japanese girl: a case report. (2009)
  • Author(s): Hayashi-Sakai, S., Taguchi, Y.
  • Journal Title: Pediatric Dental Journal 19(1)巻 Pages: 112-116
  • Peer Reviewed
• [Journal Article] Classification of maxillary canine transpositions in Japanese children: a report of 10 cases. (2009)
  • Author(s): Taguchi, Y., Hayashi-Sakai, S., I izawa, F., Numa-Kinjoh, N.
  • Journal Title: Pediatric Dental Journal 19(1)巻 Pages: 136-144
  • Peer Reviewed
• [Journal Article] The early treatment of unusual sever ectopic eruption of the bilateral maxillary canines in a young Japanese girl : a case report (2009)
  • Author(s): Hayashi-Sakai, S., Taguchi, Y.
  • Journal Title: Pediatric Dental Journal 19(1) Pages: 112-116
  • Peer Reviewed
• [Journal Article] Classification of maxillary canine transpositions in Japanese children : a report of 10 cases (2009)
  • Author(s): Taguchi, Y., Hayashi-Sakai, S., Tsuda, T.
  • Journal Title: Pediatric Dental Journal 19(1) Pages: 136-144
  • Peer Reviewed
• [Journal Article] The clinical oro-facial findings of an 11-year-old boy with 47, XYY: a case report. (2008)
  • Author(s): Hayashi-Sakai, S., Sakai, I., Kitamura, T., Sakamoto, M., Taguchi, Y.
  • Journal Title: Pediatric Dental Journal 18(2)巻 Pages: 179-186
  • Peer Reviewed
• [Journal Article] Severe cases of ectopically erupting maxillary canine with excessive mesial angulation. (2008)
  • Author(s): Taguchi, Y., Hayashi-Sakai, S., Tsuda, T.
  • Journal Title: Pediatric Dental Journal 18(1)巻 Pages: 34-42
  • Peer Reviewed
• [Journal Article] The clinical oro-facial findings of an 11-year-old boy with 47, XYY : a case report (2008)
  • Author(s): Hayashi-Sakai, S., Sakai, J., Kitamura, T., Sakamoto, M. and Taguchi, Y.
  • Journal Title: Pediatric Dental Journal 18(2) Pages: 179-186
  • Peer Reviewed
• [Journal Article] Severe cases of ectopically erupting maxillary canine with excessive mesial angulation (2008)
  • Author(s): Taguchi, Y., Hayashi-Sakai, S. and Tsuda, T.
  • Journal Title: Pediatric Dental Journal 18(1) Pages: 34-42
  • Peer Reviewed
• [Presentation] A survey of oral biopsies from paediatric patients at the University Hospital (2009)
  • Author(s): Tomizawa, M., Tsuda, T., Hayashi-Sakai S., Iizawa, F.
  • Organizer: The 22th Congress of International Association of Paediatric Dentistry
  • Place of Presentation: Munich
• [Presentation] 日本人小児における埋伏上顎犬歯による切歯の歯根吸収 (2009)
  • Author(s): 田口洋, 林-坂井幸子, 飯澤二葉子, 金城奈津子, 津田高
  • Organizer: 第46回日本小児歯科学会大会
  • Place of Presentation: 大阪
• [Presentation] 上顎中切歯埋伏の2例-先行乳歯抜去による萌出方向の改善- (2009)
  • Author(s): 津田高, 林-坂井幸子, 金城奈津子, 田口洋
  • Place of Presentation: 大阪
• [Presentation] A survey of oral biopsies from paediatric patients at the University Hospital (2009)
  • Author(s): Tornizawa, M., Tsuda, T., Hayashi-Sakai, S., Iizawa, F.
  • Organizer: The 22^<th> Congress of International Association of Paediatric Dentistry
  • Place of Presentation: Munich