1997 Fiscal Year Final Research Report Summary
Study on Wear Resistance of Dental Restorative Materials
| Project/Area Number |
08457523
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
補綴理工系歯学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
TANI Yoshiaki Kyoto University, Research Center for Biomedical Engineering, Professor, 生体医療工学研究センター, 教授 (90026881)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIKAWA Akiko Nippon Dental University at Tokyo, School of Dentistry, Assistant Professor, 歯学部, 講師 (50176153)
TOGAYA Toshihiro Kyoto University, Research Center for Biomedical Engineering, Instructor, 生体医療工学研究センター, 助手 (50127106)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Dental Restorative Materials / Wear Resistance / Abrasion Test / Composite Resin / Glass Beads Abrasion Tester |
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| Research Abstract |
A new method for quantitative measurement of occlusal wear on restoration is proposed in the present investigation. With the aim of reproducing a mechnical environment of the oral cavity, this test method uses glass beads which have the curvature and hardness similar to those of the abraded occlusal surface. The test method consists essencially in making a specimen to reciprocate on glass beads covered over a PMMA plate. The total stroke is 10,000 and it is equal to traveling 1,000m. The toothbrushing abrasion test was also carried out for comparison.
ALL of the conventional composites showed much higher wear in volume loss after the glass beads abrasion test than the microfilled resin in abrasion. The results obtained by the toothbrushing abrasion conflicted with those obtained by the glass beads abrasion. There was a close parallel between the results of the glass beads abrasion and clinical observations. Moreover, SEM studies supported the results described above. In vitro wear of sixteen posterior composite resins was then determined by the glass beads abrasion test. Microfilled posterior composites wear higher wear-resistant than highly loaded posterior composites. There is little difference in wear between submicrofilled resins and microfilled resins with the thick slurry. This suggests that the filler particle size is relatively important to wear resistance of the posterior composite materials. There is no consistency among the wear measurements in the toothbrushing abrasion test.
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