2007 Fiscal Year Final Research Report Summary
A Study on the Medicine facilitating the Root Canal Preparation
| Project/Area Number |
17591988
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Conservative dentistry
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
KOBAYASHI Chihiro Tokyo Medical and Dental University, Department of Restorative Sciences Graduate School, Associate Professor (80126226)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIOKA Takatomo Tokyo Medical and Dental University, 大学院・医歯学総合研究科, Assistant Professor (60323698)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Root canal Preparation / Decalcification / Hydrochloric acid / Strain of the dentin / Separation of the root / Swelling of the dentin |
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| Research Abstract |
In the in vitro experiment, 20% hydrochloric acid efficiently decalcified the mot canal dentin and the stress against files seemed to decrease. Especially, in nickel-titanium rotary preparation, chances of file breakage may be decreased by this decalcifying effect of 20% hydrochloric acid. Also, in very difficult cases, we could penetrate very narrow constricted canals and sometimes could make a bypass neighboring the broken file by the use of this solution. Although, the decalcified depth of the mot canal dentin by this solution has not yet been known, further investigation is needed for the safety.
The strains of the root canal dentin during root canal preparation, root canal filling, and hydration were investigated using strain gauges. As results, following knowledge were obtained :
1. Since the root canal dentin has a property of viscoelasticity, it expands very slowly then contracts very slowly.
2. By this viscoelasticity, accumulation of the strain was observed.
3. The observed maximum magnitudes of the strain were 2,000 micro strains for root canal preparation, 3,000 micro strains for root canal filling, and 8,000 micro strains for hydration, respectively.
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[Presentation] 再治療と歯根破折2006
Author(s)
小林千尋
Organizer
第2回日本歯内療法学会中部支部会
Place of Presentation
朝日大学
Year and Date
2006-10-01
Description
「研究成果報告書概要(和文)」より
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[Presentation] 歯内療法における象牙質の歪2006
Author(s)
小林千尋, 須田英明
Organizer
第27回日本歯内療法学会
Place of Presentation
徳島大学蔵本キャンパス
Year and Date
2006-07-29
Description
「研究成果報告書概要(和文)」より
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[Presentation] 根管形成時の象牙質の歪2006
Author(s)
小林千尋, 須田英明
Organizer
第124回日本歯科保存学会春季大会
Place of Presentation
パシフィコ横浜
Year and Date
2006-05-25
Description
「研究成果報告書概要(和文)」より
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