| Project/Area Number |
11671918
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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 | Okinaka Memorial Institute for Medial Research |
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Principal Investigator |
YAMADA Toshimoto Okinaka Memorial Institute for Medical Research, Researcher, 研究員 (40134712)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIZAKI Junpei Okinaka Memorial Institute for Medial Research, Researcher, 研究員 (80301737)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Reduction / Dentin / Carious dentin / Air-abrasive / Caries |
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| Research Abstract |
It was revealed that air abrasive technique with particle (size about 100μm) which was made of the peach seed shell selectively removed caries dentin under air pressure of about 3kgf/cm^2. (GRANT-IN-AID FOR SCIENTIFIC RESERCH (B)) However, it takes a long time to remove caries tissue completely. To improve the efficacy of caries removal, several conditions of air pressure and/or particle size were examined. Though the removal time of caries tissue became short when larger air pressure was supplied and/or large particle was used, under those conditions patients feel pain in clinical use. Usually air abrasion uses dry technique (particles are accelerated by compressed air), we tried to use wet technique (particles are accelerated by compressed air together with water). Though, it is well known that the cutting effect of dry technique is superior to that of wet technique, in this study it was elucidated that caries removal efficacy of wet technique was superior to that of dry technique. It is considered that dried carious dentin became hard when dry technique was used. The wet technique has additional advantages, namely reducing scattered particles reducing the heat of cutting surface and reducing patients' pain. It was ascertained that wet air abrasion technique with peach seed powder is clinically useful in this study. It was confirmed that there was no significant difference between adhesion strength of resin bonding system to the surface of caries removed tooth using wet air abrasion technique with peach seed powder and that of using the conventional rotary cutting device. From now the improvement of the clinical operation will be started.
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