2013 Fiscal Year Final Research Report
The effect of nickel titanium endodontic instruments on apical crack initiation and propagation
| Project/Area Number |
24792017
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Conservative dentistry
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| Research Institution | Showa University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | ニッケルチタンファイル / 根尖部亀裂 / 髄腔開拡 / 熱処理 / ナノインデンテーション |
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| Research Abstract |
The purpose of this study was to evaluate the effects of nickel titanium endodontic file on the cracks of apical area. We conducted 1) measurement of micro-hardness by the nanoindentation technique, 2) improving of the alloy properties by heat treatment, 3) measurement of mechanical properties of the new nickel titanium endodontic instruments consist of newly alloy, and 4) measurement of the displacement in the root canal preparation at apical area, associated with the difference of the forms of access cavity preparation. The results of these investigations suggested that it will allow, by controlling the alloy characteristics of nickel titanium endodontic file or by improving the root canal preparation, to prevent the thinning of dentine, associated with uneven excessive excavation. It was suggested that securing the dentine thickness has a possibility to reduce the stress of the root canal and the incidence of micro cracks arising from this part.
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