| Project/Area Number |
03670974
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
小児・社会系歯学
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
YAMANOUCHI Tetsuji OKAYAMA UNIVERSITY DENTAL SCHOOL DEPARTMENT OF ORTHODONTICS, ASSISTANT PROFESSOR, 歯学部, 助手 (60182599)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAGO Tadao OKAYAMA UNIVERSITY DENTAL SCHOOL DEPARTMENT OF ORTHODONTICS, PROFESSOR, 歯学部, 教授 (40064654)
MITANI Seiji OKAYAMA UNIVERSITY DENTAL SCHOOL DEPARTMENT OF ORTHODONTICS, ASSOCIATE PROFESSOR, 歯学部, 助教授 (70097517)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Fluoride-Releasing Resin / Orthodontic Adhesive / Bond Strength / Fluoride Uptake / Acid Resistance / Clinical Application / せん断接着強さ / 引張り接着強さ / フッ素放出量 / 臨床試験 |
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| Research Abstract |
For the clinical application of the fluoride-releasing resin (F-resin) in the orthodontic clinic, this study was conducted to evaluate the clinical feasibility of the F-resin as an anti-cariogenic agent and as an orthodontic adhesive. The following findings were obtained.
1.Tooth fortifying effect
First, we evaluated the tooth fortifying effect, that is one of the ways to prevent the dental caries, by means of measuring the fluoride uptake and the acid resistance using the human extracted premolar enamel adjacent to the bonding site. As the result, the usage of F-resin, as the orthodontic adhesive, made both the fluoride uptake and the acid resistance of the enamel obviously increased. This indicated the improvement of the anti-cariogenic property of the enamel.
Second, we examined the inhibitory action of the plaque formation on the enamel surface adjacent to the bonding site in the human mouth. After bonding metal brackets on the teeth with F-resin and an ordinary resin, the subjects were instructed not to brush their teeth for three weeks. At the end of the three weeks, we found no anti-plaque effects of the F-resin on the enamel surface adjacent to the bonding site with a test of the gentiana violet stain method that we employed.
2.Tensile and shear bond strengths
We measured both tensile and shear bond strengths of F-resin to bovine enamel and a metal bracket. The results suggested that F-resin exerted enough bond strength for the clinical use immediately after 24 hours from the bonding and maintained that strength after six months immersion in water. We also measured the tensile bond strength of F-resin used as an orthodontic adhesive in human subjects. The results showed that the bond strength of F-resin in the mouth was strong enough to apply in the orthodontic clinic.
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