| Project/Area Number |
10671923
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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 |
矯正・小児・社会系歯学
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
IKAWA Motohide Dental Hospital, Tohoku University, Assistant, 歯学部・附属病院, 助手 (80176065)
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| Co-Investigator(Kenkyū-buntansha) |
SUGAWARA Junji Sch. of Dentistry, Tohoku University, Assoc. Professor, 歯学部, 助教授 (00005109)
HORIUCHI Hiroshi Sch. of Dentistry, Tohoku University, Professor, 歯学部, 教授 (00013962)
MITANI Hideo Sch. of Dentistry, Tohoku University, Professor, 歯学部, 教授 (50014220)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥2,600,000 (Direct Cost: ¥2,600,000)
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| Keywords | Pulp / Blood flow / Intrusion |
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| Research Abstract |
The purpose of the present study was to examine the effect of intrusive force application on the pulp blood flow (PBF) using laser Doppler flowmeter (LDF). Measurements were made in vital upper left central incisors of the participants (age : 24-31). Short-term (approx. 20 seconds) intrusive force (app. 500 gf) was applied to the incisal edge of the examined teeth, and PBF measurements were made at approximately 2 mm to the gingival margin with opaque black rubber dam application to the examined teeth. In 6 out of 7 subjects, reduction of the LDF flux signal during the force application was observed, however, the reduction was not statistically significant. Orthodontic brackets were adhered to the labial surface of the examined tooth and upper first molars using 4-META resin. A stainless steel tube was cemented at 2 mm incisal to the gingival margin securing an exact guidance for the measurement probe. A modified utility arch (0.016 * 0.022 inch) was engaged to the brackets and activated to exert continuous intrusive force (approximately 50 gf) to the examined tooth. PBF was repeatedly measured before, during and after the intrusive force application. In addition, short-term (20 seconds) manually-controlled intrusive force (50 gf, 100 gf, 200 gf) was applied to the examined tooth and PBF was also recorded. Continuous intrusive force produced significant reduction of PBF during the force application. The reduction of PBF produced by the short term intrusive force application was not effected by the continuous intrusive force application. Results obtained suggest that the intrusive force application produces reduction of PBF and that monitoring of PBF indicates the change of the pulpal haemodynamics during Orthodontic treatment.
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