| Project/Area Number |
63870081
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
外科・放射線系歯学
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| Research Institution | Showa University |
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Principal Investigator |
MICHI Ken-ichi Showa Uni. Dentistry Professor, 歯学部, 教授 (40013891)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUI Yosirou Showa Uni. Dentistry, Assistant, 歯学部, 助手 (10181687)
TASHIRO Tunehisa Showa Uni. Dentistry, Assistant, 歯学部, 助手 (70188233)
SAITO Ken-ichi Showa Uni. Dentistry, Assistant Professor, 歯学部, 講師 (20119192)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1989: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1988: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Ultrasonic instrument / Tooth extraction / Extraction force / Duration of extraction / 抜歯後創傷治癒 / 抜歯力測定 |
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| Research Abstract |
A technique for tooth extraction using ultrasonic instrument was studied in basic and clinical application. An ultrasonic probe was inserted into the periodontal space for 60-90s to cut the periodontium under water coolant. After application of this probe the tooth was extracted with forceps to which a strain gage sensor was attached. The force applied to the sensor was transduced by an apparatus developed by us to improve the gnathodynamometer, and sequential changes of force during tooth extraction were recorded by a digital recorder and analyzed by a personal computer with our original software. The efficacy of this method compared with the conventional method used for the controls was evaluated in terms of the integrated force during extraction, duration of extraction. In the basic study, histological findings was investigated.
1. Basic study
The resulting mean values obtained of the integrated force during tooth extraction were 2.78x10^3 <plus-minus> 1.94x10^3 kg.s (8teeth) in the experimental group and 4.84x10^3 <plus-minus> 3.04x10^3 kg.s (8 teeth) in the controls (p<0.05). The mean durations of tooth extraction were 19.8 <plus-minus> 9.5s (8 teeth) in the experimental group and 32.8 <plus-minus> 15.4s (8 teeth) in the controls (p<0.05). Histologically, bone formation 2 and 3 weeks after extraction was slightly less in the experimental group than in the controls.
2. Clinical study
The resulting mean values obtained of the integrated force during tooth extraction were 1.77x10^3<plus-minus> 1.62x10^3 kg.s (12 teeth) in the experimental group and 7.00x10^3<plus-minus>5.61x10^3 kg.s (12 teeth) in the controls (p<0.05). The mean duration of tooth extraction were 10.5<plus-minus>8.10s in the experimental group and 36.5<plus-minus>30.5s in the controls (p<0.05). Delay of wound healings were not investigated.
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